CLEVIS PIN DIMENSIONS TABLE


Clevis pin sizes according to ASME B18.8.1.


Cotter Pin Sizes
Nominal
Size
Basic
Pin
Dia.
Shank
Dia.
(A)
Head
Dia.
(B)
Head
Height
(C)
Head
Chamfer
(D)
Hole
Dia.
(E)
Max. Min. Max. Min. Max. Min. ± 0.01 Max. Min.
3/16 0.188 0.186 0.181 0.32 0.30 0.07 0.05 0.02 0.088 0.073
1/4 0.250 0.248 0.243 0.38 0.36 0.10 0.08 0.03 0.088 0.073
5/16 0.312 0.311 0.306 0.44 0.42 0.10 0.08 0.03 0.119 0.104
3/8 0.375 0.373 0.368 0.51 0.49 0.13 0.11 0.03 0.119 0.104
7/16 0.438 0.436 0.431 0.57 0.55 0.16 0.14 0.04 0.119 0.104
1/2 0.500 0.496 0.491 0.63 0.61 0.16 0.14 0.04 0.151 0.136
5/8 0.625 0.621 0.616 0.82 0.80 0.21 0.19 0.06 0.151 0.136
3/4 0.750 0.746 0.741 0.94 0.92 0.26 0.24 0.07 0.182 0.167
7/8 0.875 0.871 0.866 1.04 1.02 0.32 0.30 0.09 0.182 0.167
1 1.000 0.996 0.991 1.19 1.17 0.35 0.33 0.10 0.182 0.167

Nominal
Size
Basic
Pin
Dia.
Point
Dia.
(F)
Pin
Length
(G) Note 1
Head to
Center of
Hole
(H)
End to
Center
Ref.
(J)
Head to
Edge of
Hole
Ref.
(M)
Recom.
Cotter
Pin
Size
Max. Min. Bas. Max. Min. Bas. Min.
3/16 0.188 0.15 0.14 0.58 0.504 0.484 0.09 0.440 1/16
1/4 0.250 0.21 0.20 0.77 0.692 0.672 0.09 0.628 1/16
5/16 0.312 0.26 0.25 0.94 0.832 0.812 0.12 0.752 3/32
3/8 0.375 0.33 0.32 1.06 0.958 0.938 0.12 0.878 3/32
7/16 0.438 0.39 0.38 1.19 1.082 1.062 0.12 1.002 3/32
1/2 0.500 0.44 0.43 1.36 1.223 1.203 0.15 1.127 1/8
5/8 0.625 0.56 0.55 1.61 1.473 1.453 0.15 1.377 1/8
3/4 0.750 0.68 0.67 1.91 1.739 1.719 0.18 1.628 5/32
7/8 0.875 0.80 0.79 2.16 1.989 1.969 0.18 1.878 5/32
1 1.000 0.93 0.92 2.41 2.239 2.219 0.18 2.128 5/32

Note 1: Pin Length tabulated is intended for use with standard clevis, without spacers. When other lengths are required, it is recommended that they be limited wherever possible to nominal lengths in 0.06-inch increments.

All dimensions are given in inches.

Supplements:

Reference:

  • ASME B18.8.1-1994, Clevis Pins and Cotter Pins (Inch Series)
  • Oberg.E , Jones.D.J., Holbrook L.H, Ryffel H.H., (2012) . Machinery's Handbook. 29th edition.  Industrial Press Inc. , pp 1747
  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc. , pp 1796