The O-Ring, cataloged under National Stock Number 5331-01-631-0674, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is W S Darley & Co Div Darley Pump Division. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | W S Darley & Co Div Darley Pump Division (CAGE 5B337); Engineered Seal Products Inc Dba Esp International (CAGE 5F263) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-631-0674 |
| Primary Part Number | 3601121 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | W S Darley & Co Div Darley Pump Division |
| 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 |
|---|---|
| 3601121 PRIMARY | W S Darley & Co Div Darley Pump Division (USA) |
| OR-173 NBR-70 | Engineered Seal Products Inc Dba Esp International (USA) |
NSN 5331-01-631-0674 is a O-Ring, manufactured by W S Darley & Co Div Darley Pump Division, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-631-0674 has 2 manufacturer part numbers on file: 3601121 (W S Darley & Co Div Darley Pump Division), OR-173 NBR-70 (Engineered Seal Products Inc Dba Esp International).
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.