ISO 2341:1986

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.