Overview
ISO 2341:1986 specifies the characteristics of clevis pins with head (articulation axes) manufactured to metric dimensions with nominal diameters from 3 mm up to and including 100 mm. The standard defines two product types: Type A (pin without split-pin hole) and Type B (pin with split-pin hole). It sets requirements for materials, surface finishes, dimensional designation and quality of execution to support interchangeable, reliable fastening in mechanical assemblies.
Key Topics
- Scope and Types
- Type A: clevis pin with head and no split-pin hole.
- Type B: clevis pin with head and a hole for a split pin (cotter pin).
- Nominal diameters: metric sizes from 3 mm to 100 mm (inclusive).
- Material designation: example designation uses "St" to indicate steel suitable for heading or cold forging, with typical hardness ranges indicated in the document.
- Surface finishes and coatings:
- Preferred finishes include black oxide, phosphating and zinc plating with chromate conversion (see referenced ISO standards).
- All tolerances apply before coating or deposition.
- Quality and acceptance:
- Parts must be uniform and free from harmful irregularities or burrs.
- Acceptance and inspection follow the referenced acceptance standard.
- Designation examples (format shown in the standard):
- Axe d’articulation ISO 2341 - B - 20 x 100 - St
- Axe d’articulation ISO 2341 - B - 20 x 100 x 6,3 - St
- Axe d’articulation ISO 2341 - B - 20 x 100 x 6,3 x 80 - St
These show how to indicate type, nominal diameter, length, split-pin hole diameter and position when applicable.
Applications
Clevis pins with head standardized by ISO 2341:1986 are used where a removable pivot or hinge pin is required. Typical applications include:
- Mechanical linkages and articulation points in machinery
- Agricultural and construction equipment
- Assembly where interchangeable fasteners are needed for maintenance
- Situations requiring a split pin for positive retention (Type B)
Note: for high-shear applications (for example some railway uses), the standard notes a recommendation to select a split pin and corresponding hole diameter that is the next standardized size larger when shear forces are significant.
Related Standards
- ISO 1234 - Split pins (metric series)
- ISO 2081 - Electroplated zinc coatings on iron or steel
- ISO 3269 - Fasteners - Acceptance inspection
- ISO 4520 - Chromate conversion coatings on zinc and cadmium deposits
These referenced standards provide complementary requirements for split-pin sizes, surface treatments and inspection methods that apply to parts manufactured to ISO 2341:1986.
For procurement and design, use the designation examples in the standard to specify type, nominal diameter, length and any split-pin hole details to ensure correct manufacture and interchangeability.
