← Cotter pins
AN381-1-6
AN381 cotter pin
| Head / form | Cotter pin |
|---|---|
| Diameter / thread / size | nominal 1/32; A .030" (+.000 -.003); recommended drill hole .035" (+.005 -.002) |
| Grip / length / thickness | length .375" (L ±.031) |
| Material / finish | Corrosion-resistant steel (type C per procurement specification), passivate after pickling |
| Reference confidence | high |
| Source | AN381 Rev 4 sheet 1 ↗ |
Head / form source: AN381 Rev 4 sheet 1
Source notes and limits
- MS24665F Table VIII: AN381-1-6 "3/ NO REPLACEMENT". Note: MS24665F Table V does list MS24665-1002 (1/32 x 3/8); Table VIII does not cite it, so SpecLok does not call it a replacement.
- AN381 recommends a .035" drill hole for 1/32; MS24665F Table I recommends .047" for the same nominal size.
- Example: "EXAMPLE OF PART NO: AN381-2-10 = 1/16 (2/32) NOM DIA COTTER PIN, .625 IN LENGTH. AN381-25-10 = 5/64 (2.5/32) NOM DIA COTTER PIN, .625 IN LENGTH."
- "INACTIVE FOR DESIGN AFTER 1 MARCH 1961. USE MS24665." "CANCELED AFTER 1 AUGUST 1968." (AN381 sheet 1).
- "AN381 AND MS24665 CORROSION RESISTANT STEEL PINS OF THE SAME NOMINAL DIAMETER AND BASIC LENGTH ARE UNIVERSALLY, FUNCTIONALLY AND DIMENSIONALLY INTERCHANGEABLE."
- FAA AC 43.13-1B para 7-103 (p.7-17): "COTTER PINS (AN380). Cotter pins are used for securing bolts, screws, nuts, and pins. Use AN381 or MS24665 cotter pins in locations where nonmagnetic material or resistance to corrosion is desired. Cotter pins should not be reused."
Documented cross-references
Relations below are the cited document's statements. Check the controlling drawing and current standard before substitution.
- AN381-1-6 · substitute · no replacement
MS24665 Rev F p.8, Table VIII ↗
Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers