The O-Ring, cataloged under National Stock Number 5331-01-535-5601, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Ems Technologies Inc Div Defense & Space Systems. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-535-5601 |
| Primary Part Number | 171021-1 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Ems Technologies Inc Div Defense & Space Systems |
| Status | ACTIVE |
| 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 |
|---|---|
| 171021-1 PRIMARY | Ems Technologies Inc Div Defense & Space Systems (USA) |
| Reference | Meaning |
|---|---|
| 171021-1 | 5/9 Secondary reference Accurate Precision Fastener Corp. Div Accurate Precision Fasteners Corp |
NSN 5331-01-535-5601 is a O-Ring, manufactured by Ems Technologies Inc Div Defense & Space Systems, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-535-5601 has 1 manufacturer part number on file: 171021-1 (Ems Technologies Inc Div Defense & Space Systems).
Key specifications for 171021-1: End Item Identification: F-22 RAPTOR. 0 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.