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Bolt, Screw, Nut and Washer Identification Chart

At one time or another, all of us (even the pros) misidentify a fastener.  Not that the guys at the hardware store don't need a chuckle every now and them.  Use this handy chart, courtesy, to get the name right the first time!

Fastener Categories

Phillips wood screw
Slotted machine screw
Phillips sheet metal screw
hex head self drilling screw
Slotted wood screw
Phillips machine screw
Hex head phillips sheet metal screw
self drilling phillips screw
Wood Screws
Screws with a smooth shank and
tapered point for use in wood.
Abbreviated WS
Machine Screws
Screws with threads for use with a nut or tapped hole.
Abbreviated MS
Sheet Metal Screws
Fully threaded screws with a point
for use in sheet metal.
Abbreviated SMS
Self Drilling SMS
A Sheet metal screw with
a self drilling point.
Hex head bolt long shank
carriage bolt
lag bolt
set screw
hex head bolt
Hex Bolts
Bolts with a hexagonal head with
threads for use with a nut or
tapped hole.
Abbreviated HHMB or HXBT
Carriage Bolts
Bolts with a smooth rounded
head that has a small square
section underneath.
Lag Bolts
Bolts with a wood thread
and pointed tip.
Abbreviated Lag
Set Screws
Machine screws with no
head for screwing all the
way into threaded holes.

Head Styles

slotted and phillips screw head
 oval phillips screw head
 pan screw head
truss screw head
A countersunk head
with a flat top.
Abbreviated FH
A countersunk head
with a rounded top.
Abbreviated OH or OV
A slightly rounded head
with short vertical sides.
Abbreviated PN
An extra wide head with a rounded top.
Abbreviated Truss
 round screw head
hex screw or bolt head
hex washer bolt head
slotted hex washer head
A domed head.
Abbreviated RH
A hexagonal Head.
Abbreviated HH or HX
Hex Washer
A hex head with built
in washer.
Slotted Hex Washer
A hex head with built
in washer and a slot.


Drive Types

  Phillips and frearson screw heads
  Slotted screw heads
  combination phillips-slotted screw head
socket or allen screw head
Phillips and Frearson
An X shaped drive.
Abbreviated PH
A slot in the head.
Abbreviated SL
A combination of slotted
and Phillips drives.
Abbreviated Combo
Socket or Allen
A hexagonal hole for use
with and Allen wrench.

Nut Types

hex nut
nylon insert lock nut
short jam nut
Nylon insert jam lock nut
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
A hex nut with a reduced
Nylon Insert Jam Lock
A nylock nut with a reduced
Wing nut
Acorn or cap nut
Flanged nut
Kep nut with integral lock tooth washer
A nut with 'wings' for hand
Cap or Acorn
A nut with a domed top over
the end of the fastener.
A nut with a built in washer
like flange.
A nut with a built in external
tooth lock washer, used to
speed up assembly.
threaded tee nut for wood fastenning
square nut
high temperature prevailing torque lock
A nut designed to be driven
into wood to create a threaded
A four sided nut.
Prevailing torque lock
A non-reversible nut used for high temperature applications.

Washer Types

flat washer
fender washer
finishing washer
Split lock washer
A flat washer used to
distribute load. Available in
SAE, USS, and other patterns.
An oversize flat washer used
to further distribute load
especially on soft materials.
A washer used to obtain a
'finished' look. Usually used
with oval head screws.
Split Lock
The most common style of
washer used to prevent nuts
and bolts from backing out.
external tooth lock washer
internal tooth lock washer
square washer
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.
A square shaped washer.

Our thanks to BoltDepot, your online source for ALL your fastener needs, for sharing this chart with us!

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