Cotter Pins
The country’s largest in-stock line of cotter pins, including self-locking and hammerlock styles.

Our Standard - Extended Prong and Hammerlock
All sizes and shapes manufactured to customer’s specifications for varied industrial applications.

Available in carbon steel, stainless steel, brass, monel, copper, aluminum, high carbon steel, (plain or heat treated) in special shapes, extra long. Plain or plated.

Designed to meet or exceed MS24665 Army-Navy, and ASME B18.8.1 specifications. Western Wire Cotter Pins are of the highest quality and backed by years of manufacturing experience.

Metric sizes also available.
Our Standard
Extended Prong - Chisel Point
Available 1/32" dia. thru 1" dia.
Hammerlock
Expressly made for castellated nuts for fast, accurate assembly.
1/16" thru 3/8" dia.
Specials
Taper Point
Align assembly for easy insertion, 3/32" thru 3/8" dia.
Extended Prong
Even End
Even End - Chisel Point

Self - Locking
Use where spreading space is limited. Up to & including 5/16" dia. only.

Tee Head
Humped
1/16" thru 1/4" dia. only.
Cotter Pin Size Range
Diameter (inch)
Lengths (inch)
1/32 and 3/64
1/4 thru 1-1/2
1/16
1/4 thru 3
3/32 and 5/64
1/2 thru 4
1/8 and 7/64
1/2 thru 4
5/32 and 9/64
3/4 thru 4
3/16
3/4 thru 4
1/4 and 7/32
1 thru 6
5/16
1 thru 6
3/8
1-1/2 thru 18
1/2 and 7/16
2 thru 22
5/8
3 thru 22
3/4
3 thru 22
7/8
to order
1
to order
1-1/4
to order
 


ASME B18.8.1 Specifications

Nominal Size on Basic Pin Diameter
Total Shank Diameter*
Wire Width
Head (OD) Diameter
Extended Prong Length
Gauge Hole Diameter
+/- 0.001
 
"A"
"B"
"C"
"D"
 
Max.
Min.
Max.
Min.
Min.
Min.
1/32"
0.031
0.032
0.028
0.032
0.022
0.06
0.01
0.047
3/64"
0.047
0.048
0.044
0.048
0.035
0.09
0.02
0.062
1/16"
0.062
0.06
0.056
0.06
0.044
0.12
0.03
0.078
5/64"
0.078
0.076
0.072
0.076
0.057
0.16
0.04
0.094
3/32"
0.094
0.09
0.086
0.09
0.069
0.19
0.04
0.109
7/64"
0.109
0.104
0.1
0.104
0.08
0.22
0.05
0.125
1/8"
0.125
0.12
0.116
0.12
0.093
0.25
0.06
0.141
9/64"
0.141
0.134
0.13
0.134
0.104
0.28
0.06
0.156
5/32"
0.156
0.15
0.146
0.15
0.116
0.31
0.07
0.172
3/16"
0.188
0.176
0.172
0.176
0.137
0.38
0.09
0.203
7/32"
0.219
0.207
0.202
0.207
0.161
0.44
0.1
0.234
1/4"
0.25
0.225
0.22
0.225
0.176
0.5
0.11
0.266
5/16"
0.312
0.28
0.275
0.28
0.22
0.62
0.14
0.312
3/8"
0.375
0.335
0.329
0.335
0.263
0.75
0.16
0.375
7/16"
0.438
0.406
0.4
0.406
0.32
0.88
0.2
0.438
1/2"
0.5
0.473
0.467
0.473
0.373
1
0.23
0.5
5/8"
0.625
0.598
0.59
0.598
0.472
1.25
0.3
0.625
3/4"
0.75
0.723
0.715
0.723
0.572
1.5
0.36
0.75

Note:
Total shank diameter, "A" Dimension, is two times wire thickness.
"A" is measured at end of pin where no gap is permitted.

Lengths not listed, quotation upon request.

 

Metric Specifications

Nominal Size on Basic Pin Diameter
Total Shank Diameter*
Wire Width
Head (OD) Diameter
Extended Prong Length
Gauge Hole Diameter
+/- 0.03
 
"A"
"B"
"C"
"D"
 
Max.
Min.
Max.
Min.
Min.
Min.
1.2 mm
1.0
0.9
1.0
0.8
1.7
1.2
1.20
1.6 mm
1.4
1.3
1.4
1.1
2.4
1.2
1.60
2.0 mm
1.8
1.7
1.8
1.4
3.2
1.2
2.00
2.5 mm
2.3
2.1
2.3
1.7
4.0
1.2
2.50
3.2 mm
2.9
2.7
2.9
2.2
5.1
1.6
3.20
4.0 mm
3.7
3.5
3.7
2.8
6.5
2.0
4.00
5.0 mm
4.6
4.4
4.6
3.5
8.0
2.0
5.00
6.3 mm
5.9
5.7
5.9
4.6
10.3
2.0
6.30
8.0 mm
7.5
7.3
7.5
5.9
13.1
2.0
8.00

Meets ASME B18.8.6M Specifications