Fastener Categories
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Wood
Screws
Screws with a smooth shank
and tapered point for use in wood.
Abbreviated WS
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Machine
Screws
Screws with threads for use
with a nut or tapped hole.
Abbreviated MS |
Thread Cutting Machine
Screws
Machine screws with a thread cutting (self tapping) point.
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Sheet
Metal Screws
Fully threaded screws with
a point for use in sheet metal.
Abbreviated SMS
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Self
Drilling SMS
A Sheet metal screw with a
self drilling point.
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Hex
Bolts
Bolts with a hexagonal head
with threads for use with a nut or tapped hole.
Abbreviated HHMB or HXBT
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Carriage Bolts
Bolts with a smooth rounded
head that has a small square section underneath.
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Lag
Bolts
Bolts with a wood thread
and pointed tip.
Abbreviated Lag
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Flange Bolts
Flange bolts have a flange on the bottom of the head that distributes the load like a washer. |
Socket Screws
Socket screws, also known as Allen head, are fastened with a hex Allen wrench. |
Eye Bolts
A bolt with a circular ring on the head end. Used for attaching rope or chain. |
Eye Lags
Similar to an eye bolt but with wood threads instead of machine thread. |
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U-Bolts
Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend.
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J-Bolts
J shaped bolts are used for tie-downs or as an open eye bolt.
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Shoulder Bolts
Shoulder bolts (also known as stripper bolts) are used to create a pivot point.
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Elevator Bolts
Elevator bolts are often used in conveyor systems. They have a large, flat head.
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Sex Bolts
Sex bolts (a.k.a. barrel nuts or Chicago bolts) have a female thread and are used for through bolting applications where a head is desired on both sides of the joint.
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Mating Screws
Mating screws have a shoulder that matches the diameter of the sex bolts they are used with.
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Hanger Bolts
Hanger bolts have wood thread on one end and machine thread on the other end.
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Set
Screws
Machine screws with no head
for screwing all the way into threaded holes.
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Head Styles
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Flat
A countersunk head with a
flat top.
Abbreviated FH
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Oval
A countersunk head with a
rounded top.
Abbreviated OH or OV
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Pan
A slightly rounded head with
short vertical sides.
Abbreviated PN
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Truss
An extra wide head with
a rounded top.
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Round
A domed head.
Abbreviated RH
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Hex
A hexagonal Head.
Abbreviated HH or HX
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Hex Washer
A hex head with built
in washer.
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Slotted Hex Washer
A hex head with built
in washer and a slot.
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Socket Cap
A small cylindrical head using a socket drive. |
Button
A low profile rounded head using a socket drive. |
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Drive Types
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Phillips
The standard drive type for most screws.
Abbreviated PH |
Frearson
Similar to Phillips. Requires a Frearson driver for installation.
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Slotted
A slot in the head.
Abbreviated SL
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Combination
A combination of slotted and
Phillips drives.
Abbreviated Combo
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Socket, Hex or Allen
A hexagonal hole for use with
an Allen wrench.
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One Way
Installs with a normal slotted driver but can not be removed without special tools.
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Square
Also known as Robertson drive.
Abbreviated SQ or SD.
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Star
Also known as Torx®. A six-pointed star pattern, specifically designed to prevent cam-out and stripped heads. |
Nut Types
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Hex
A six sided nut. Also referred
to as a finished hex nut.
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Nylon
Insert Lock
A nut with a nylon insert
to prevent backing off.
Also referred to as a Nylock
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Jam
A hex nut with a reduced height.
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Wing
A nut with 'wings' for hand
tightening.
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Cap
A nut with a domed top over
the end of the fastener.
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Acorn
Acorn nuts are a high crown type of cap nut, used for appearance. |
Flange
A nut with a built in washer
like flange.
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Tee
A nut designed to be driven
into wood to create a threaded hole.
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K-Lock or Kep
A nut with an attached free-spinning external tooth lockwasher.
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2-Way Reversible Lock
A lock nut that can be installed either side up. Often used in high temperature applications. |
Coupling
Coupling nuts are long nuts used to connect pieces of threaded rod or other male threaded fasteners.
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Slotted
Slotted nuts are used in conjunction with a cotter pin on drilled shank fasteners to prevent loosening.
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Castle
Castle nuts are similar to slotted nuts but with the slots in a rounded section above the main nut. |
Washer Types
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Flat
A flat washer used to
distribute load. Available in SAE, USS, and other patterns.
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Fender
An oversize flat washer used
to further distribute load especially on soft materials.
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Finishing
A washer used to obtain a
'finished' look. Usually used with oval head screws.
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Split
Lock
The most common style of washer
used to prevent nuts and bolts from backing out.
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External
Tooth Lock
A washer with external 'teeth'
Used to prevent nuts and bolts from backing out.
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Internal
Tooth Lock
A washer with internal 'teeth'
Used to prevent nuts and bolts from backing out.
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Square
A square shaped washer.
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Dock
Dock washers have a larger outside diameter and are thicker than standard.
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Ogee
Thick, large diameter, cast iron washers with a curved or sculpted appearance. Typically used in dock and wood construction
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Sealing
A neoprene washer bonded to a metal backing. Used to seal out air/water or dampen noise and vibration.
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