AN960 vs NAS1149: what replaced what

AN960 Rev 21 was cancelled on 16 September 2011. Notice 2, dated 15 January 2016, says "NAS1149, 'Washer, Flat' supersedes AN960" and cross-references each cancelled AN960 part number to a NAS1149 part number. The part number is different: the table lists AN960-416 against NAS1149F0463P.[1][2]

Document

AN960: Air Force-Navy Aeronautical Standard, Rev 21 dated 6 August 1992. Cancelled 16 September 2011. Notice 2 of 15 January 2016 is the later notice.[1][2]
NAS1149: National Aerospace Standard "Washer, Flat". Adopted by the Department of Defense on 6 August 1992.[3]

Part number

AN960: AN960-416 (example)[2]
NAS1149: NAS1149F0463P (listed against AN960-416 in Table 1 of Notice 2)[2]

What the notices say

AN960: Cancelled. Notice 2 states it is superseded by NAS1149.[2]
NAS1149: Named by both notices as the standard that follows AN960.[1][2]

Dimensions, materials, finish codes

AN960: See the AN960 part pages for the transcribed sheet.
NAS1149: Not in a public source: NAS1149 is an AIA document that SpecLok has not read

AN960 vs NAS1149: what replaced what: what the public documents say
Property	AN960	NAS1149
Document	Air Force-Navy Aeronautical Standard, Rev 21 dated 6 August 1992. Cancelled 16 September 2011. Notice 2 of 15 January 2016 is the later notice.[1][2]	National Aerospace Standard "Washer, Flat". Adopted by the Department of Defense on 6 August 1992.[3]
Part number	AN960-416 (example)[2]	NAS1149F0463P (listed against AN960-416 in Table 1 of Notice 2)[2]
What the notices say	Cancelled. Notice 2 states it is superseded by NAS1149.[2]	Named by both notices as the standard that follows AN960.[1][2]
Dimensions, materials, finish codes	See the AN960 part pages for the transcribed sheet.	Not in a public source: NAS1149 is an AIA document that SpecLok has not read

This page reports what public documents print. It does not approve a substitution. The aircraft's IPC, SRM or engineering authority decides what may be installed.

Reference only: the controlling drawing, its process spec and the manufacturer's installation instructions govern. How to use these answers

What the notices and sheets say4

Notice 2 (15 January 2016), page 1: "AN960 REVISION 21, dated 6 AUGUST 1992, was cancelled on 16 September 2011. NAS1149, “Washer, Flat” supersedes AN960. Table 1 provides a detailed cross-reference of cancelled AN960 Part or Identifying Numbers (PIN) and replacement NAS1149 PINs."[2]
Notice 1 (16 September 2011), page 1: "AN960 REVISION 21, dated 6 AUGUST 1992, is hereby cancelled. Future acquisitions for this product should refer to NAS1149".[1]
Both notices, page 1: "CAUTION: The supersession information is valid as of the date of this notice and may be superseded by subsequent revisions of the superseding document."[1][2]
Notice 1 of 2011 headed its table: "AFTER 6 AUGUST 1992, AN960 WASHERS ARE INACTIVE FOR NEW DESIGN, EXISTING STOCK MAY BE USED UNTIL DEPLETED. SUBSITITUION SHALL BE IN ACCORDANCE WITH THE FOLLOWING TABLE." Notice 2 of 2016 does not print that heading. Its table is headed "TABLE 1. AN960 REV21 to NAS1149 cross-reference data." The part number pairs in the two tables are the same.[1][2]

Sources

Each number above links to its document. Scanned sheets were read by eye and re-read by OCR; the check script is in the repository under docs/audit-2026-10/reddit-pages.

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Part number

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