Clevis pins

For the grooved CLPGS-0250-1000 example, 1.000 in shank length gives 0.906 in effective length. The nominal quarter-inch group lists an actual diameter of 0.243–0.248 in. Verify the effective length, groove and keeper geometry for the assembled grip. ISO 2341's headed types A and B differ in whether a split-pin hole is provided. Huyett Grooved, p. 34.

Identity and joint function

Huyett’s headed clevis pin uses a cylindrical unthreaded shank and a separate retainer. Huyett, Clevis Pins, Standard–Imperial, ©2015, p. 24.

The pin crosses the fork and eye. The retainer limits axial escape. Check joint rotation, shear and bearing at the actual interfaces.

ISO 2341:1986, edition 2, covers headed clevis pins in metric nominal diameters from 3 through 100 mm. Its public abstract distinguishes type A without a split-pin hole from type B with a split-pin hole. Thus a head alone does not imply that a cross-hole exists. ISO lists this edition as confirmed in 2022. These statements concern the published scope, not an assessment of conformity of any supplier part. ISO 2341:1986 public catalog.

Headless clevis pins form a separate standardized family: ISO 2340:1986, edition 2, covers types without and with split-pin holes over the same 3–100 mm nominal-diameter range. Headed and headless forms therefore require different axial-retention arrangements. ISO 2340:1986 public catalog.

Retaining features and neighboring pin families

A split pin is the retaining component in the ISO type-B terminology. It must not be confused with the larger solid clevis pin merely because both names include pin. “Cotterless” describes removal of that separate component, rather than equivalence of all retaining mechanisms. ISO 2341 abstract; Huyett Cotterless, p. 33.

Length basis and dimensional limits

A pin has several axial dimensions. Under-head shank length excludes head thickness; overall length includes it. Usable or effective length stops at the relevant retaining feature. The precise endpoint matters: an edge of a hole, its centerline and a groove face are different planes. These definitions are an engineering interpretation of dimensioned geometry, not interchangeable supplier labels.

Huyett's Standard–Imperial drawing labels under-head-to-tip length G and effective length M. Its grooved drawing uses B for shank length and E for length to the head-side groove face. Dimension letters therefore belong to their drawing. Standard–Imperial, p. 24; Grooved, p. 34.

For example, the grooved CLPGS-0250-1000 row gives 1.000 in shank length and 0.906 in effective length. Its nominal 1/4 in diameter group lists actual outside-diameter limits of 0.243–0.248 in, groove-diameter limits of 0.210–0.213 in, groove-width limits of 0.029–0.032 in, and an effective-length tolerance of +0.020/−0.000 in. These are ©2015 supplier values, not universal or ISO tolerances. Huyett Grooved, p. 34.

Derived geometry: for a straight stack of coaxial parts, let S be the assembled stack thickness, including washers, and U the distance from the under-head bearing face to the nearest boundary needed clear for retainer installation. If S exceeds U, that assembly obstructs the retaining feature. S being less than U establishes only geometric clearance under those assumptions; it does not prove acceptable axial play, retainer seating or strength. Hole clearance similarly depends on actual hole and shank limits, not equal nominal diameter labels. All values in either comparison require compatible units.

Materials and finish scope

Huyett's Standard–Imperial page lists low-carbon plain steel, unspecified stainless steel, 316 stainless steel, zinc-clear and zinc-yellow options, while noting that combinations are not available in every size. Its grooved CLPGS page specifically lists 18-8 stainless steel, plain. The cotterless CLPCZ page lists low-carbon steel with zinc-clear finish. These descriptions belong to their respective catalog families; none establishes one material or heat treatment for all clevis pins. Standard–Imperial, p. 24; Grooved, p. 34; Cotterless, p. 33.

Engineering synthesis: a grade label or plating color alone does not establish hardness, lot strength, coating thickness, corrosion life or suitability for contact with another metal. Pin bending, shear, bearing at the holes, fork/eye failure, fatigue, wear and retention under service conditions can limit an assembly independently. A pin's dimensional designation is insufficient to assign a safe working load or approve a lifting, vehicle or structural application.

Source and coverage limits

The Huyett drawings and tables above carry ©2015 and a notice that dimensions, materials and other specifications may change without notice. They were inspected as manufacturer-authored catalog extracts on a third-party digital-asset host, including the actual drawing pages. They are historical reference examples, not current availability or lot certification. ISO references use public publisher catalog information only; the full purchased standards and their complete tolerance/material clauses were not reviewed. JW Winco's undated GN 113.3 web description was accessed on October 30, 2026 PDT; the other sources were accessed on the same date.

This reference does not establish interchangeability across inch and metric families, cross-hole and groove variants, or a customer's approved assembly. Application loads, mating-hole geometry, stack tolerances, service environment, retention requirements and the released component specification remain assembly-specific.

For the broader assembly context, see Hardware and component references.