The Ring,retaining, cataloged under National Stock Number 5325-01-285-2130, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Keystone Intl Inc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-285-2130 |
| Primary Part Number | NMP-1521 PIECE 16 |
| Item Name | Ring,retaining |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Keystone Intl Inc |
| Status | ACTIVE |
| Usage Design | INTERNAL |
| Material Document and Classification | ASTM A276, TY 302 ASSN STD SINGLE MATERIAL RESPONSE |
| Casehardening Indicator | NOT CASEHARDENED |
| Material | STEEL COMP 302 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| NMP-1521 PIECE 16 PRIMARY | Keystone Intl Inc (USA) |
| Reference | Meaning |
|---|---|
| NMP-1521 PIECE 16 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| 024.302.0028 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5325-01-285-2130 is a Ring,retaining, manufactured by Keystone Intl Inc, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-285-2130 has 1 manufacturer part number on file: NMP-1521 PIECE 16 (Keystone Intl Inc).
1 possible match (shared part number, not a government interchangeability claim): 5325-01-290-8216. Verify interchangeability with system specifications before substitution.
Key specifications for NMP-1521 PIECE 16: Usage Design: INTERNAL; Material Document and Classification: ASTM A276, TY 302 ASSN STD SINGLE MATERIAL RESPONSE; Casehardening Indicator: NOT CASEHARDENED; End Item Identification: W/S: WASP CLASS LHD; FORRESTAL CLASS CV. 4 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.