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AN525-416-9

AN525 washer head screw

AN525-416-9 cited reference fields
Head / formWasher head, slotted
Diameter / thread / size.250-28UNF-3A (1/4-28) (dash 416)
Grip / length / thicknesslength 9/16" (±1/32), grip 5/32" (G)
Material / finishSteel: "STEEL SPEC AMS 6300 OR MIL-S-6050 TENSILE STRENGTH 125 000 PSI (MIN)"
Reference confidencehigh
SourceAN525 Rev. 2 (29 Jan 1985), Screw - Washer Head, with Amendment 1 (20 May 1996), sheet 1, notes 1-3 and dash table ↗

Head / form source: AN525 Rev 2 title block; note 3 (R = recessed head)

Source notes and limits

  • "PART NUMBERS ADD R BETWEEN FIRST AND SECOND DASH NOS FOR RECESSED HEAD SCREWS ADD "D BEFORE FIRST DASH NUMBER FOR AL ALLOY SCREWS SIZE 8 AVAILABLE WITH NC THREAD ONLY" (note 3)
  • Supersession: AN525, dated 29 January 1985, is hereby canceled and superseded by NASM525. The Part Identification Number (PIN) for AN525 and the part number for NASM525 are identical. The part numbers have not been changed. (AN525 Rev 2 Notice 1, Notice of Cancellation (21 June 2000))
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Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers