STAINLESS STEEL WASHERS FOR CLEVIS PINS (COARSE) DIN 1441

Washers for Clevis Pins (Coarse) DIN 1441 — DIN 1441 performs exactly the same retaining role as DIN 1440 in a split-pin-secured clevis joint - sitting between the split pin and the clevis fork to give a defined bearing surface and protect the fork material from wear - but it is produced to the coarser of the two tolerance classes within DIN's clevis pin washer range. That wider tolerance suits less precision-critical or heavier general-purpose linkages, where a tighter fit is not necessary and the coarser series is both adequate and more readily available, whereas DIN 1440's medium tolerance is used where the design specifically calls for a tighter fit. The two should not be swapped without checking which the design actually requires: substituting DIN 1441 for a DIN 1440 specification is only acceptable where the coarser tolerance is genuinely acceptable for the application, so the tolerance requirement on the assembly drawing should be checked before treating the two as interchangeable. It is also worth being clear that DIN 1441 is not a general-purpose flat washer alternative - it is dimensioned specifically for clevis pin diameters and their typical head bearing surfaces, which differs from a threaded-fastener washer like DIN 125, so the two are not generally interchangeable for clevis pin retention despite superficially similar appearance. These washers are common in linkages, lifting gear, agricultural equipment, and general pinned machinery joints wherever a clevis pin assembly is the specified fastening method rather than a threaded bolt and nut. Material selection follows the equipment's operating environment: carbon steel for general indoor machinery, A2 (304-equivalent) stainless for outdoor or washdown equipment, and A4 (316-equivalent) for agricultural, marine, or coastal machinery exposed regularly to moisture, mud, or salt. To choose correctly, match the bore to the clevis pin diameter and confirm the application genuinely accepts the coarser tolerance series rather than requiring the medium DIN 1440 fit.

FAQs
When is the coarse series specified instead of the medium series?
Where the application tolerates, or requires, a wider manufacturing tolerance, such as less precision-critical or heavier general-purpose linkages, whereas DIN 1440 is used where a tighter fit is needed.

How does DIN 1441 differ from a standard flat washer such as DIN 125?
DIN 1441 is dimensioned specifically for clevis pin diameters and their typical head bearing surfaces, whereas DIN 125 is a general-purpose washer for threaded bolt and nut assemblies; the two are not generally interchangeable.

Can DIN 1441 be used in place of DIN 1440?
Only if the coarser tolerance is acceptable for the application; where a defined, tighter fit is required by the design, the medium-series DIN 1440 washer should be used instead.