Split Pins Dimensions Calculator was developed according to ISO 1234:1997 - " Split Pins " standard to show dimensions of split pins (metric).

The split pins are intended for use with clevis pins and in pinned bolt and nut assemblies or other type of free fitting pinned assemblies in general applications.

Some important notes from the ISO 1234:1997:

- Materials: Steel, copper - zinc alloy, copper, aluminum alloy, austenitic stainless steel.

- Each leg of the split pin shall be capable of withstanding being bent back upon itself once, with no visible indication of fracture occurring at the point of bend.

- The eye shall be as circular as possible. The cross-section of the two straight legs together shall be circular.


Nominal Pin Size
Pin Length *

Note * : Commercial lengths advised in ISO 1234 : 1997 standard.


Split Pins Dimensions
Parameter Symbol Value Unit
Nominal Size (Pin Hole Diameter) - --- mm
Maximum Pin Diameter dmax ---
Minimum Pin Diameter dmin ---
Maximum Extended Prong Length amax ---
Minimum Extended Prong Length amin ---
Eye Length b ---
Maximum Eye Outer Diameter cmax ---
Minimum Eye Outer Diameter cmin ---
Maximum Length lmax ---
Nominal Length lnom ---
Minimum Length lmin ---
Corresponding Bolt Diameter over ---
to ---
Corresponding Clevis Pin Diameter * over ---
to ---

Note * : For railway applications and in cases where split pins in clevis pins are subjected to alternating transverse forces, it is recommended to use the next larger split pin size to that given by the calculator.


Clevis Pin: A type of cylindrical pin with a head at one end and with a hole passes through the diameter at the other end. A clevis pin is generally locked in place with a split pin. Clevis pins provide rotation between connected components about pin axis.

  • ISO 1234 : 1997, Split Pins