Metric Hex bolts

Hexagon set bolts

Hex set bolt
A full thread bolt has threads all the way up to the hex head.
Stainless steel
A-2 stainless is equivalent to 18-8 stainless. It is an alloy with high corrosion resistance and is the material of choice for most exterior and marine applications.
Steel 8.8 grade (HT) High tensile
Made from medium carbon steel available zinc plated. Best for general use.   
Steel 10.9 grade
Made from alloy steel quenched, tempered, available zinc plated. Often used for automotive use and other areas where high strength is needed.

Hexagon bolts

Metric hex bolts
A partialially threaded bolt has a hex head and a smooth shoulder area between the standard amount of threading. Available in coarse, medium and fine pitch threads.
Stainless Steel
A-2 stainless is equivalent to 18-8 stainless. It is an alloy with high corrosion resistance and is the material of choice for most exterior and marine applications
Steel 8.8 grade (HT) High tensile
Made from medium carbon steel available zinc plated. Best for general use.
Steel 10.9 grade
Made from alloy steel quenched, tempered, available zinc plated. Often used for automotive use and other areas where high strength is needed.

Machine Screws

Shapes of Screw Head

(1) Pan, (2) Button, (3) Round, (4) Truss, (5) Flat, (6) Oval

• (1) Pan head: a low disc with chamfered outer edge.
• (2) Button or dome head: cylindrical with a rounded top.
• (3) Round: dome-shaped, commonly used for machine screws.
• (4) Truss: lower-profile dome designed to prevent tampering.
• (5) Flat or Countersunk: conical, with flat outer face and tapering inner face allowing it to sink into the material, very common for wood screws.
• (6) Oval: countersunk with a rounded top.
• Cheese head: disc with cylindrical outer edge, height approximately half the head diameter.
• Fillister head: cylindrical, but with a slightly convex top surface.
• Socket head: cylindrical, relatively high, with different types of sockets (hex, square Torx, etc.)
• Mirror screw head: countersunk head with a tapped hole to receive a separate screw-in chrome-plated cover, used for attaching mirrors.

Types of machine screw drive
Modern machine screws use a wide variety of drive designs, each requiring a different kind of tool to drive in or extract them. The most common screw drives are the slotted and Phillips; hex, Robertson, and torx are also common in some applications. Some types of drive are intended for automatic assembly in mass-production of such items as automobiles. More exotic screw drive types may be used in situations where tampering is undesirable, such as in electronic appliances that should not be serviced in the home.

(1) Slotted, (2) Phillips, (3) Pozidriv, (4) Torx, (5) Hex, (6) Robertson, (7) Tri-Wing, (8) Torq-Set, (9) Spanner

• Slot head has a single slot, and is driven by a flat-bladed screwdriver. The slotted screw is common in woodworking applications, but is not often seen in applications where a power driver would be used, due to the tendency of a power driver to slip out of the head and potentially damage the surrounding material.
• Cross-head, cross-point or Phillips screw has a "+"-shaped slot and is driven by a cross-head screwdriver, designed originally for use with mechanical screwing machines. The Phillips screw drive has slightly rounded corners in the tool recess, and was designed so the driver will slip out, or cam out, under strain to prevent over-tightening. The Phillips Screw Company was founded in Oregon in 1933 by  Henry F. Phillips, who bought the design from J. P. Thompson. Phillips was unable to manufacture the design, so he passed the patent to the American Screw Company, who were the first to manufacture it.
• Pozidriv is patented, similar to cross-head but designed not to slip, or come out. It has four additional points of contact, and does not have the rounded corners that the Phillips screw drive has. Phillips screwdrivers will usually work in Pozidriv screws, but Pozidriv screwdrivers are likely to slip or tear out the screw head when used in Phillips screws. Pozidriv was jointly patented by the Phillips Screw Company and American Screw Company.
• Torx   is a star-shaped or splined bit with six rounded points. These were found in early Apple Macintosh computers, to discourage home repairs. A "tamper-proof" type of Torx head has a small pin inside the socket.
• Hexagonal or hex screw head has a hexagonal hole and is driven by a hexagonal wrench, sometimes called an Allen key, or by a power tool with a hexagonal bit.
• Robertson head has a square hole and is driven by a special power-tool bit or screwdriver. The screw is designed to maximize torque transferred from the driver, and will not slip, or cam out. It is possible to hold a Robertson screw on a driver bit horizontally or even pendant, due to a slight wedge fit. Commonly found in Canada in carpentry and woodworking applications and in Canadian-manufactured electrical wiring items such as receptacles and switch boxes.
• square-drive head is an American clone of the Robertson that has a square hole without taper. Due to the lack of taper, the hole must oversize relative to the screwdriver, and is much more likely to strip than the Robertson.
• Tri-Wing screws have a triangular slotted configuration. They are for instance used by Nintendo on its Game Boys  to discourage home repair.
• Torx-Set is an uncommon screw drive that may be confused with Phillips; however, the four legs of the contact area are offset in this drive type.
• Spanner drive uses two round holes opposite each other, and is designed to prevent tampering. Commonly seen in elevators in the United States.

Metric machine screws
The diameter of a ISO preferred series machine screw is usually specified in millimetres (mm) prefixed by the capital letter M, as in "M6" for a 6 mm diameter screw.

The pitch of metric threads varies according to the diameter, but not absolutely regularly. Some examples: a M3 thread has a 0.5 mm pitch, M4 0.7 mm, M6: 1 mm, M10: 1.5 mm, M12: 1.75 mm, M14: 2 mm, M16: 2 mm, M18 to M22: 2.5 mm.

The diameter of a metric machine screw is the outer diameter of the thread. The tapped hole (or nut) into which the screw fits, has an internal diameter which is the size of the screw minus the pitch of the thread. Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shaft, and the nut or threaded hole is made by tapping threads in a 5 mm hole.

Metric machine screw threads are also available in "fine pitch" versions, sometimes several pitches for one diameter (example: M18/fine in 1, 1.5 and 2 mm pitches). The fine thread series is deprecated and not recommended for use in new designs. The fine metric threads were once found in equipment made in the Far East, but that has changed with the standardisation of the ISO preferred thread series.

Non-metric machine screws
Before the metric system was common, many engineering companies had their own standard screw sizes. The first person to create a standard (in about 1841) was the English engineer Sir Joseph Whitworth. Whitworth screw sizes are still used, both for repairing old machinery and where a coarser thread than the metric fastener thread is required. This system had two thread sizes: coarse (BSW) and fine (BSF). The thread angle was 55°.

A later standard in the UK was the BA system, named after the British Association for Advancement of Science. Screws were described as "2BA", "4BA" etc., the odd numbers being rarely used. While not related to ISO metric screws, the sizes were actually defined in metric terms, a 0BA thread having a 1 mm pitch. These are still the most common threads in some niche applications. Certain types of fine machinery, such as moving-coil meters, tend to have BA threads wherever they are manufactured. Curiosly enough, even though every other fastener on a camera may use metric threads, the tripod socket will likely be a 1/4"-20 thread.

The USA has its own system, usually called the Unified Thread Standard. A version of this standard, called SAE for the Society of Automotive Engineers, was used in the American automobile industry. The SAE is still associated with inch based fasteners by the public even though the U.S. auto industry (and other heavy industries relying on SAE) switched to ISO preferred series fasteners back in the 1970s and afterwards.

Screws are described as 4-40, 6-32, 8-32, 10-32, 10-24, etc. (for numeric sizes, odd numbers are rare), or 1/4"-20, 1/4"-28, etc. (for inch unit sizes), with the first number giving shaft diameter (numeric or inches) and the second number being threads per inch.

These machine screws are sometimes found outside the USA in older model personal computers based on the IBM PC specification. Since the computer industry is now based in Asia (mostly Taiwan), the industry now uses metric fasteners. As more and more products are made outside the U.S. and then imported into the U.S., the use of inch based fasteners is declining, and it is only a matter of time before the inch fastener series is gone forever.

Other thread systems include BSP (British Steam Pipe; used for other purposes as well) and CEI (Cycle Engineers Institute, used on bicycles in Britain and possibly elsewhere), NPT and NPTF (coarse and fine pipe threads), and PG (German: "Panzer-Gewinde"), used in thin plate metal, such as for switches and nipples in electrical equipment housings.

Countersunk machine screw (Measure: total length).
A Countersunk machine screws is designed to fit flush with the surface of the fastened material for a smooth safe finish.

Raised Countersunk machine screw.
A raised head on a countersunk machine screw giving a slightly rounded top for a more finished look.

Pan head machine screw (Measure: from under head).
A domed head machine screw sits on the surface of the material to be fastened, has a flat underside and can be used with washers.

Cheese Head machine Screw (Measure: from under head).
Head style: Slotted.  A Cheese head machine screw sits on the surface of the material to be fastened and have a flat underside, can be used with washers.

Round Head machine screw (Measure: from under head).
Head style: Slotted.  A Round head machine screw sits on the surface of the material to be fastened and have a flat underside, can be used with washers.

Metric Machine Screw Tapping Chart

Imperial Machine Screw Tapping Chart

Machine Screws
Tapping & Clearance Hole
(sizes 0 - 6)

Machine Screws
Tapping & Clearance Hole
(sizes 8 - 3/8)

Machine Screws
Tapping & Clearance Hole
(sizes 7/16 - 11/16)

Machine Screws
Tapping & Clearance Hole
(sizes 3/4 - 1-3/16)

Machine Screws
Tapping & Clearance Hole
(sizes 1-1/4 - 1-3/4)

Washers

Washers provide a greater bearing surface under the fastener. This helps prevent a nut, bolt or screw from pulling through the material.

• Flat washers.
  Used under the head of a bolt or nut to distribute the forces applied when tightening.
  
• Spring washers.
  Lock washers place tension against a nut after tightening, to help prevent the nut from loosening.
  
• External tooth lock washers (Serrated).
  Uses external teeth for locking and tension.
  
• Internal tooth lock washers (Serrated).
  Uses internal teeth for locking and tension. Less aggressive than external with a smaller outside diameter.
  
• Repair Washer (Penny Washers).
  Repair washers have larger outside diameters than standard washers. Each size is available with various outside diameters . Usually 1/16 thick.  Used to attach machine thread fasteners. Available in several styles and materials.

Nuts

• Hex Fullnut.
  Used for fastening to a bolt when mechanically joining materials together. This type is also known as Hexagon fullnut.
  
  
• Nylon insert nuts (Nyloc nuts).
  A hex nut used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material located at the top of the hex nut. This helps prevent loosening from vibration.
  
  
• Wing nuts.
  A nut that has Wings (or ears) which can be turned by hand.
  
  
• Hex Dome nut (Acorn nut).
  A hex nut with a dome enclosed top. Bolts must be must be finished to the correct length.
  
  
• Hex Lock nut (Hexagon Half nut).
  A slim hex nut designed for locking off a fullnut. Should be used under the hex fullnut.  When the hex fullnut is tightened the load is transferred in the opposite direction.
  
  
• Tee nut (Pronged Tee nut).
  A pressed tubular nut with a flat top and sharp teeth angled at 90`, designed to knocked into a drilled hole in timber. Applications include bed and table leg screw adjusters.

Nails

• ROUND WIRE NAIL- This is used for general work. It is not attractive in shape and it can split wood when hammered in position.
  
  
• CLASP NAIL- Traditional square cut nail used for fixing timber to soft masonry.
  
  
• LOST HEAD NAIL- This is the perfect nail when it is required to conceal the head of the nail as a punch can be used to hammer the head beneath the surface level. Reduces timber deformation when punched below the surface.
  
  
• ANNULAR NAIL- The teeth of this nail hold it in place firmly and it is used for fixing wood and other materials. Use where permanent strength and holding power are of primary importance.
  
  
• COPPER CLOUT NAIL- Generally used for slate roofing, insulation board, ceilings and partitions.
  
  
• MASONRY NAILS- Used for making fixings to masonry. Normally made of hardened zinc and are very hard nails for brick and concrete.
  
  
• OVAL NAIL- This is a long nail and care must be taken when it is hammered into the wood. It is unlikely to split the wood.

Coach Bolts and Coach Screws

Coach bolt (Carriage bolts)

A carriage bolt or coach bolt is mostly used in wood, with a domed top and a square under the head designed to pull into the wood as the nut is tightened.  A carriage bolt can also be used in drilled concrete fence and gate posts to fasten wooden post and panels. Zinc plated steel for moderate protection against rust.  Stainless steel A2 with high corrosion resistance. Stainless has become the material of choice for exterior and most marine applications.

Coach Screw

Coach screws are for fastening in wood. Available in Steel, Zinc Plated steel and Stainless steel.
Available with hexagon and square drive head.  Used in decorative work and heavy applications.  Stainless steel A2 is an alloy of steel with high corrosion resistance.  Stainless has become the material of choice for exterior and most marine applications.  Steel is zinc plated for moderate protection against rust.

Socket Screws (Allen bolts)

Socket Countersunk Screw
DIN 7991
(common sizes listed below)

Socket Button head  
ISO 7380

Socket Setscrews
(Metric range)
Din 913/914/915/916

Socket Cap screws
(Metric Range)
  Din 912
(common sizes Listed Below)

Socket Cap Screw
Unified (American) range

All dimensions are maximum in Inches

Socket screws, also known as Allen head are tightened with a Allen hex wrench.

• Socket cap head.
  Also known as socket cap screw. A socket cap screw is a bolt with a socket wrench drive set within a small cylindrical head. Made from heat treated alloy steel. Best for applications where extreme strength and hardness are required. Black finish and available zinc plated.
  
• Socket countersunk head.
  A countersunk bolt with a hexagon socket drive. High tensile countersunk fastener for applications where loads require high strength. Black finish and available zinc plated.
  
• Socket button head.
  A bolt with a round profile head and socket drive. Retains high tensile strength properties but has pleasing aesthetic looks. Black finish and available zinc plated.
  
• Socket set screw (Hex drive grub screw).
  A headless hex key drive screw. Retains high tensile strength properties. Frequently used to retain parts onto shafts as the screw top can be "finished" below the surface. Black finish and available zinc plated.

Wood Screws

A wood screw can provide a strong, neat fixing to walls, wood and timber. The screw will pull together the surfaces to be joined as the thread on the shank is rotated. The fixing is very strong and can be taken apart easily. The screw length should be about three times the thickness of the timber it is fixing in place. The thicker the screw, the greater the grip.

Designed specifically for use in wood, the wood screw has now caught up to the 21st century. The old British standard style of slotted head and tapered shank woodscrews are far less popular and now tend to be used in bespoke joinery applications. The majority of screws now sold are the "Twin threaded" and "Chipboard (also known as continental) screws". 

The Twin thread wood screw has a double start thread which winds the screw in at twice the normal speed. This is fine in softer woods as twice the drive torque is required, also the extra torque required exerts far more stress onto the tooling being used especially when driving longer screws or working with hard woods.
The Chipboard screw was originally designed for particle boards. This screw is only available with cross recessed (pozi) drive it has a sharp point for easy starting, a single deep cut thread and has a wax coating on zinc and yellow plating. This design is very easy to use and works very well on harder woods and deep screwing applications. Sizes are in millimetres i.e. 4.0mm x 25mm.

Screw sizes

A wood screw is sold according to length and shank diameter. The length is determined as the distance between the top of the screw and the surface of the wood. The higher the shank diameter, the thicker the screw.

Types of screw

Roundhead Screw
Used mostly for fixing items without countersink holes. The top is rounded and sits out from the surface.

Crosshead Screw
A popular type of screw with DIY customers because the cross-shaped design prevents the screwdriver slipping whilst in the process of working with various materials.

Countersunk Slotted Screw
Traditional screw with a long shank diameter. It is widely used in DIY projects and most suitable for work with furniture and restoration work.

Twin thread
The twin thread screws have two deep threads interwoven with each other. The shank of the screw is narrower, which gives the screw greater grip.

Dry wall screw
This is thinner than a normal screw, with a sharper point. The thin head enables it to be driven into the surface of board or studwork easily. It is commonly used on stud walls for fixing the plasterboard, and sometimes the timberwork itself.

Coach screw
Coach screws have a large hexagonal or square head and are used for a variety of DIY projects. A pilot hole should be drilled, and the screw fastened with an appropriate sized spanner or socket.

Mirror screw
This is mostly used for fixing mirrors. Mirror screws have a countersunk slotted screw, which is fixed first. A dome shaped chrome cover is then fastened into the top of the screw.

Chipboard screw
This is similar to the traditional countersunk type, but has a deeper thread which allows it to grip better in chipboard and the like.

Self tapping Screw
Self Tapping screws are used in harder materials such as metal and fiberglass. A hole, the gauge of the shank, is drilled first. The screw then cuts a thread into the material as it is tightened.

Clutch Head Screw
Clutch Head screws have a unique crosshead pattern which enables the screw to be done up, but not undone. It is used for fitting locks and other security devices.

Countersunk wood screw.
Countersunk screws fit flush, into the surface for a smooth surface finish. Available in slotted and cross recessed drive head styles.  Brass is an alloy of copper with good corrosion resistance. Once common for marine use, it has been replaced by stainless steel. Used mostly in decorative applications.  Steel is zinc plated for protection against rust.  Stainless steel A2 is an alloy of steel with high corrosion resistance. Stainless has become the material of choice for exterior and most marine applications.

Slotted Cheese head.
A barrel shaped head wood screw, with slot drive. The underside of the head is flat and sits on the surface of the material being fastened.

Raised countersunk wood screw.
Raised head countersunk screws are similar to standard a countersunk screw but have a raised rounded top for a more finished look. Available in slotted and cross recessed drive head styles.

Slotted round head wood screw.
A round head screws head has a flat underside and sits on the surface of the material to be fastened.

Floorboard Screw
Floor-Tite® is based around the revolutionary MDF-Tite® but designed to meet the specific demands of todays high density fibre floorboards. Increasing the diameter from 3.9mm to 4.2mm matches the heavier boards used in the flooring industry. The product is again CPT hardened but more emphasis on ductility, specifically important where movement occurs, such as in floor boards. Again, like Deck-Tite®, the Tr-Lock threadform does not allow the screw to work loose over time, this means no squeaking boards.

Two sizes suit the fibre floorboards currently used today:
4.2mm x 45mm
4.2mm x 55mm

Tongue Screw
Tongue-Tite® Tongue and groove screw.  
 
The ultimate Tongue and groove wood screw
Star Recess (ST10);  Greater grip and control on application.
Part Thread;  Reduces ‘Jacking’ where a full threaded screw tends to pull apart the jointed material.
Finish;  Available ex-stock in Net-Coat™ yellow plated, other coatings available to order.
TS Thread;  Utilises benefits of both twin and single thread on the same screw.
Single Coarse Thread Designed to eliminate the ream out of the floor boarding, giving high pull out retention.
Twin Thread;  Breaks even the hardest floor boarding surface and delivers a balanced point of pick up.
Narrow countersunk head gives a neat flush fix to allow the next board to sit in place.
Solid Collar;  Gives strength to the most vulnerable point of the screw.
Hardened;  Specifically developed so the screw will not break as the flooring flexes under use.
Tri-Lock™ TS Threadform;  Three flats on thread means less surface contact between screw and floorboard when driven in - which means less battery wear, easier to insert and the screw will not work loose as the boards are walked upon.
Sizes;  Just one size (3.5 x 45mm) to suit the popular floorboards currently used in today’s market. Boxed in 200’s.
Installation;  We recommend that you insert the Tongue-Tite screw at an angle of 30 - 45 degrees to the exposed face on the tongue side, and start where the tongue & face intersect (see below). 

This will drive the screw through the board and out into the substrate. Make sure the head of the screw sit beneath the tongue so it does not interfere with the next piece.
For a secure fix we advise that you insert a screw every 300mm. (Please note: If inserting a screw 50mm from the end of the board we recommend that you pre-drill to stop any splitting.)

Deck Screw 

This wood screw not only offers the perfect balance between ease of insertion and pull-out retention, while increasing the core sheer strength, but means in simple terms that the need for two gauges is negated. Deck-Tite® performs with the strength of a 10 gauge screw but with the versatility of an 8 gauge screw. So, unlike our competitors, we do not have to run with 8 sizes when 4 will do.

Added to this the Spiral Point, which enables the screw to start immediately into any material. This is proved, tested and successful.

The case hardening of this screw meansno pilot hole is necessary. The screw has a partial thread which enables two pieces of material to be joined without face to face lift (Jacking). 

An industry standard Cross Recess means no searching for driver bits

The NET-COAT finish makes it ideal for any Out Door application and, unlike screw brands, it does not suffer from recess fill – meaning the driver bit need never jump out in application.

The deck screw and outdoor wood screw that carries the TDA DeckmarkTM accreditation
Cross Recess (PZ2)
Industry standard - No searching for a driver bit.
Collar
The collar gives this decking screw strength to the most vulnerable point of the screw, whilst also allowing a deeper recess and less cam-out for a secure drive.
Part Thread
Eliminates ‘jacking’ where a full threaded screw tends to pull apart the jointed material.
Tri-Lock™ Threadform
Three flats on the thread means that as the deck screw is driven in there is less surface contact between the screw and timber, allowing less battery wear, easier insertion and the screw will not work loose as the boards are walked upon.
Single Thread
Drives in the wood without reaming, enabling a swift, efficient fix with high pull out retention.
Net-Coat™ Green for OutDoor use
A special deck screw developed for the new pressure treated timber and outdoor use.
CPT™ Hardened
Permeated case with through hardening allows the perfect balance between core ductility and surface toughness - with the strength of a high tensile bolt the screw will not snap - no pilot hole required.

Spiral Point
Immediate start.
Installation
• Use a quality PZ2 drive bit & install the screw perpendicular to the deck.
• By increasing drill speed as the screw threads into the deck will reduce wood split.
• No pilot hole required in most applications.
• Drive the screw flush, do not overdrive.
• If cam-out occurs, remove and replace. (To eliminate cam-out use an impact driver).
• Use two screws at every joist.

Deck-Tite®’s unique ‘thread pitch to Core Size Ratio’ gives the perfect balance between ease of insertion and pull-out retention whilst increasing the core sheer strength. It’s Tri-Lock™ thread forms, not cuts, a thread in the material expanding the wood which then relaxes back around the screw ensuring a tight and locked fix. Once driven in the screw will not move, it is secure for good - no stubbed toes!

Core Size Ratio means thatonly a 4.5mm gauge deck screw is necessary. Deck-Tite’s threadform enables it to perform to the strength of a 4.8mm (10g) screw but posses the versatility of a slimmer screw.

Decking Screw For Extreme Marine Environments
Deck-Tite® Plus, the ultimate in Outdoor wood screw. Whether its extreme marine environments or the new pressure treated timbers - including ACQ, Deck-Tite® is the only screw to use and the only screw guaranteed for ACQ in the

Deck-Tite® Plus, the ultimate in Outdoor wood screw. Whether its extreme marine environments or the new pressure treated timbers - including ACQ, Deck-Tite® is the only screw to use and the only screw guaranteed for ACQ in the. Manufactured from Grade 316 Austenitic stainless steel and treated with Net-Coat Clear for ultimate resistance against galvanic and chloride stress corrosion.

Deck-Tite Plus is an Austenitic grade 316 stainless steel Deck-Tite screw treated with Net-Coat Clear coating. This screw is guaranteed corrosive resistant for all applications, including:

Marine; Polluted environments and all pressure treated timber, including: Copper Azole; Copper Quaternary and Chromated Copper Arsentate. 

The screw exhibits all the features Deck-Tite which means that in all soft woods and some hard woods a pilot hole is not necessary; and utilising the Tri-Lock thread form, once driven in the screw will not work lose over time as the deck is walked upon.

The screw has a square drive recess that allows high insertion torque without reaming out the recess.

Deck-Tite comes in 4 sizes that match the needs of most deck installations. The screws are all 4.5mm in diameter which means that they are suitable for all deck boards. 2 inch (50mm); 2.1/4 inch (57mm); 2.1/2 inch (63mm) 3 inch (75mm).

The general rule is that the screw is fixed 2/3s into the substrate (deck joist) and 1/3 into the deck board. Because the screw has a partial thread, the screw works as a clamp, this also allows a certain amount of lateral movement, essential in a deck screw. Choose the screw length that matches the deck board installation.
Deck-Tite plus is the only deck screw that answers all deck installation concerns.

Composite Decking Screw 
Deck-Tite Composite deck screw, composite timber is now being used as an alternative to natural timber in outdoor use such as decks, playground equipment, marine environments, agricultural and many more.
This composite timber exhibits problems for the normal wood screw, the Deck-Tite® Composite deck screw addresses these problems resulting in an efficient and neat fix. Coated in Net-Coat Brown for Out Door use Deck-Tite® Composite is the only screw to use with Composite timber.

Composite material now being used as a replacement for wooden decking is now becoming more common. The material comes in several variants from all plastic to a variant of plastic and wood.

Deck-Tite® Composite decking screw is designed to work with all variants of composite Timber. The material poses several problems to a standard deck screw, the most notable is that swarf builds up outside the hole where the screw is driven and cause the screw to sit proud. Deck-Tite® composite deck screw has a unique thread form that drives the swarf back into the hole, the screw head then sits flush with the composite surface.

Another problem with composite materail is that normal screws are difficult to drive into composite material. Here, Deck-Tite® Composite uses the Tri-Lock TS® threadform to overcome these difficulties, resulting in a screw that drives in perfectly in all composite Timber.

On application, the rules are the same as for Deck-Tite® with 2/3 of the screw fixing into the substrate (joist) and 1/3 of the screw in the deck board.

Deck-Tite® Composite is treated with Net-Coat® brown that is corrosive resistant in most outdoor applications.

Screw-tite Wood Screw and General Purpose Screw
Countersink Ribs
Cutting edge ribs ream and self - countersink the wood screw.
Collar
Gives strength to the most vulnerable point of the wood screw.
CPT™ Hardened
Permeated case with through hardening allows the perfect balance between core ductility and
surface toughness - with the strength of a high tensile bolt the screw will not snap.
Masonry Screw
Can be screwed directly into masonry, no plastic plug required, just a pilot hole 1mm less than the screw. (i.e. 6mm Screw-Tite® = 5mm hole)
Tri - Lock™ Threadform
Three flats on thread means less surface contact between wood screw and material when driven in, this means less battery wear,
easier to insert and the screw will not work loose over time as the material flexes under use.
Cross Recess
Industry standard - no searching for a driver bit. Swift and easy bit location.
Part Thread
Eliminates ‘jacking’ where a full threaded screw tends to pull apart the jointed material.
TS Thread (Exaggerated)
Utilises benefits of both twin and single thread on the same wood screw.
Single Coarse Thread
Drives in without reaming a hole in the material, enabling a swift efficient fix with high pullout retention.
Twin Thread
Penetrates the dense surface and balances the screw with two points of pickup that start right at the tip of the screw.
Finish
Available ex-stock in Net-Coat™ yellow plated, other coatings available to order.

This allpurpose wood screw for Indoor and out door use. ‘Screw-Tite®’ extensively developed with the discerning craftsman/woman in mind, utilises the ‘Tri-Lock TS’ threadform which uniquely and cleverly incorporates the benefits of a single thread and a twin thread on the same screw, thus making it the most technically advanced screw available but more importantly the best performing woodscrew there is – a bold statement, we know, but we listened to what the user wanted and gave them just that. 

Supplied in 30 sizes, from 12mm to 100mm.

The Spiral Point beaks through even the hardest dense surface. A twin thread engages the material and balances the point of pick-up, a thread is dropped, a single thread engages enabling high pull-out retention and less blistering on end grain. The Tri-Lock shank reduces insertion torque (25% over a standard woodscrew)Part-thread shank reduces jacking (parting between jointed material)Under-head ribs displaces material – self countersinks. Once driven in the Tri-Lock shank remains tight, will not unseat as the material flexes under use. Cross-Drive recess, secure and safe. Hardened, hence no pilot hole necessary.

Outside Use Wood Screw, HEAVY DUTY
Timber-Tite universal heavy duty EXTERIOR timber fixing (sometimes referred to as a Landscape screw). Can replace cup square bolts for an easy, quick, secure and neater fix.

Star recess - Secure drive, essential for high torque driving
Countersunk Head - Neat and flush fix, allowing boards to be placed over posts.
Under head ribs - Self countersinking.
Ultra Part Thread - parting between posts & Joist during fixing (jacking).
Net-Coat-Green -  Weather resistant finish suitable for outdoor applications
Resistant to burn-off while being driven in. Doesn’t crack under load in application.
Single Tri-Lock Thread -  reduces wood split, This wood screw means no pilot hole necessary in most applications.
Coarse Thread -  High pull out retention.
Timber-Tite® comes in 4 sizes designed to meet most applications.
M6.5x80; M6.5x145; M6.5x200 M6.5x250.

The only heavy duty timber (landscape) screw that will sit flush when fixed, allowing a facia board to be fixed over it - essential in decking.
This wood screw is now available in 200mm and 250mm the screws are made from high tensile steel while exhibiting ductility so will not break in use.

Common usages:
6.5x80mm used to fix deck joists.
6.5x145mm used to fix Newel Posts.
6.5x200mm used in heavier deck installations and truss work.
6.5x250mm often used to fix railway sleepers but can be used on any other heavy duty application.

MDF Board Screw
MDF-Tite® This screw is specifically designed to match the needs demanded for fixing MDF, manufactured in four sizes that match the boards currently on the market. The following sizes have been developed to meet the boards in use in the market place: 3.9x25, 3.9x30, 3.9x40, 3.9x45.

Based on the revolutionary Tri-Lock TS threadform which uniquely incorporates the benefits of a single thread and a twin thread on the same MDF screw, MDF-Tite® is the perfect solution to all MDF applications.

CPT hardened to allow high torque insertion while maintaining ductility, under head ribs for self countersinking and as with all the Tite range of MDF screws, once driven in the Tri-Lock threadform ensures the screw will not work out over time.