Fastener Type Chart

This technical information has been supplied by boltdepot.com

Fastener Categories

Wood Screws OEM Supply Hardware Supplies in Auckland
Wood Screws

Screws with a smooth shank and tapered point for use in wood.
Abbreviated WS

Hex Bolts OEM Supply Hardware Supplies in Auckland
Hex Bolts

Bolts with a hexagonal head with threads for use with a nut or tapped hole.
Abbreviated HHMB or HXBT

Machine Screws OEM Supply Hardware Supplies in Auckland
Machine Screws

Screws with threads for use with a nut or tapped hole.
Abbreviated MS

Carriage Bolts OEM Supply Hardware Supplies in Auckland
Carriage Bolts

Bolts with a smooth rounded head that has a small square section underneath.

Sheet metal screws OEM Supply Hardware Supplies in Auckland
Sheet Metal Screws

Fully threaded screws with a point for use in sheet metal.
Abbreviated SMS

Lag Bolts OEM Supply Hardware Supplies in Auckland
Lag Bolts

Bolts with a wood thread
and pointed tip.
Abbreviated Lag

Self Drillings SMS OEM Supply Hardware Supplies in Auckland
Self Drilling SMS

A Sheet metal screw with a self drilling point.

Set Screws
Set Screws

Bolts with a wood thread
and pointed tip.
Abbreviated Lag

Head Styles

Flat OEM Supply Hardware Supplies in Auckland
Flat

A countersunk head with a flat top.
Abbreviated FH

Round OEM Supply Hardware Supplies in Auckland
Round

A domed head.
Abbreviated RH

Oval OEM Supply Hardware Supplies in Auckland
Oval

A countersunk head with a rounded top.
Abbreviated OH or OV

Hex OEM Supply Hardware Supplies in Auckland
Hex

A hexagonal Head.
Abbreviated HH or HX

Pan OEM Supply Hardware Supplies in Auckland
Pan

A slightly rounded head with short vertical sides.
Abbreviated PN

Hex Washer
Hex Washer

A hex head with built
in washer.

Truss OEM Supply Hardware Supplies in Auckland
Truss

An extra wide head with a rounded top.
Abbreviated Truss

Slotted Hex Washer OEM Supply Hardware Supplies in Auckland
Slotted Hex Washer

A hex head with built in washer and a slot.

Drive Types

Phillips and Frearson OEM Supply Hardware Supplies in Auckland
Phillips and Frearson

An X shaped drive.
Abbreviated PH

Slotted
Slotted

A slot in the head.
Abbreviated SL

Combination OEM Supply Hardware Supplies in Auckland
Combination

A combination of slotted and Phillips drives.
Abbreviated Combo

Socket or allen OEM Supply Hardware Supplies in Auckland
Socket or Allen

A hexagonal hole for use with and Allen wrench.

Nut Types

Hex OEM Supply Hardware Supplies in Auckland
Hex

A six sided nut. Also referred to as a finished hex nut.

WIng OEM Supply Hardware Supplies in Auckland
Wing

A nut with 'wings' for hand tightening.

Tee OEM Supply Hardware Supplies in Auckland
Tee

A nut designed to be driven into wood to create a threaded hole.

Nylon Insert Lock
Nylon Insert Lock

A nut with a nylon insert
to prevent backing off.
Also referred to as a Nylock

Cap or Acorn
Cap or Acorn

A nut with a domed top over the end of the fastener.

Square OEM Supply Hardware Supplies in Auckland
Square

A four sided nut.

Jam OEM Supply Hardware Supplies in Auckland
Jam

A hex nut with a reduced height.

Flange OEM Supply Hardware Supplies in Auckland
Flange

A nut with a built in washer like flange.

Prevailing torque lock OEM Supply Hardware Supplies in Auckland
Prevailing torque lock

A non-reversible nut used for high temperature applications

Nylon Insert Jam Lock OEM Supply Hardware Supplies in Auckland
Nylon Insert Jam Lock

A nylock nut with a reduced height.

Kep OEM Supply Hardware Supplies in Auckland
Kep

A nut with a built in external tooth lock washer, used to speed up assembly.

Washer Types

Flat OEM Supply Hardware Supplies in Auckland
Flat

A flat washer used to
distribute load. vailable in SAE, USS, and other patterns.

External Tooth Lock
External Tooth Lock

A washer with external 'teeth' Used to prevent nuts and bolts from backing out.

Fender OEM Supply Hardware Supplies in Auckland
Fender

An oversize flat washer used to further distribute load especially on soft materials.

Internal Tooth Lock
Internal Tooth Lock

A washer with internal 'teeth' Used to prevent nuts and bolts from backing out.

Finishing OEM Supply Hardware Supplies in Auckland
Finishing

A washer used to obtain a 'finished' look. Usually used with oval head screws.

Square OEM Supply Hardware Supplies in Auckland
Square

A square shaped washer.

Split Lock OEM Supply Hardware Supplies in Auckland
Split Lock

The most common style of washer used to prevent nuts and bolts from backing out.