TECHNICAL RESOURCES
Fastener Types
Wood Screws
Machine/Metal Thread Screw
Sheet Metal Screw
Hex Bolt/Set Screw
Coach Bolt
Tek Screw
Socket Screw
Wood Screws
Screws with a smooth shank and tapered point for use in wood.
Machine/Metal Thread Screw
Screws with threads for use with a nut or tapped hole.
Sheet Metal Screw
Full thread, pointed, used in sheet metal.
Hex Bolt/Set Screw
Bolts with a hexagonal head with threads for use with a nut or tapped hole.
Coach Bolt
Bolts with a smooth rounded head that has a small square section underneath.
Tek Screw
A Sheet metal screw with a self drilling point.
Socket Screw
Socket screws, also known as Allen head are fastened with a hex Allen wrench.
Eye Bolt
Coach Screw
U-Bolt
J-Bolt
Lag Screw
Screw Eye
Grub Screw
Eye Bolt
A bolt with a circular ring on the head end. Used for attaching rope or chain.
Coach Screw
Bolts with a wood thread
and pointed tip.
U-Bolt
Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend.
J-Bolt
J shaped bolts are used for tie-downs or as an open eye bolt.
Lag Screw
Hanger bolts have wood thread on one end and machine thread on the other end.
Screw Eye
Similar to an eye bolt but with wood threads instead of machine thread.
Grub Screw
Machine screws with no head for screwing all the way into threaded holes.
Head Styles
Countersunk
Raised
Pan
Mush
Round
Hex
Hex Washer
Slotted Hex Washer
Socket Cap
Button
Countersunk
A countersunk head with a flat top.
Raised
A countersunk head with a rounded top.
Pan
A slightly rounded head with short vertical sides.
Mush
An extra wide head with a rounded top.
Round
A domed head.
Hex
A hexagonal Head.
Hex Washer
A hex head with built
in washer.
Slotted Hex Washer
A hex head with built in washer and a slot.
Socket Cap
A small cylindrical head using a socket drive.
Button
A low profile rounded head using a socket drive.
Drive Types
Phillips and Ponzi
Slotted
Combination
Socket, Hex or Allen
Phillips and Ponzi
An X shaped drive.
Slotted
A slot in the head.
Combination
A combination of slotted and Phillips drives.
Abbreviated Combo
Socket, Hex or Allen
A hexagonal hole for use with an Allen wrench.
Nut Types
Hex
Nylon Insert Lock
Jam/Lock
Nylon Insert Jam Lock
Wing
Dome
Acorn
Hex
A six sided nut. Also referred to as a finished hex nut.
Nylon Insert Lock
A nut with a nylon insert
to prevent backing off.
Also referred to as a Nylock
Jam/Lock
A hex nut with a reduced height.
Nylon Insert Jam Lock
A nyloc nut with a reduced height.
Wing
A nut with ‘wings’ for hand tightening.
Dome
A nut with a domed top over the end of the fastener.
Acorn
Acorn nuts are a high crown type of cap nut, used for appearance.
Flange
Tee
Square
Cone Lock
Keps
Coupling
Flange
A nut with a built in washer like flange.
Tee
A nut designed to be driven into wood to create a threaded hole.
Square
A four sided nut.
Cone Lock
A non-reversible lock nut used for high temperature applications
Keps
A nut with an attached free-spinning external tooth lockwasher.
Coupling
Coupling nuts are long nuts used to connect pieces of threaded rod or other male threaded fasteners.
Washer Types
Flat
Mudguard
Cup
Spring
External Tooth Lock
Internal Tooth Lock
Square
Heavy Duty
Flat
A flat washer used to
distribute load.
Mudguard
An oversize flat washer used to further distribute load especially on soft materials.
Cup
A washer used to obtain a ‘finished’ look. Usually used with oval head screws.
Spring
The most common style of washer used to prevent nuts and bolts from backing out.
External Tooth Lock
A washer with external ‘teeth’ Used to prevent nuts and bolts from backing out.
Internal Tooth Lock
A washer with internal ‘teeth’ Used to prevent nuts and bolts from backing out.
Square
A square shaped washer.
Heavy Duty
Dock washers have a larger outside diameter and are thicker than standard.
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