The O-Ring, cataloged under National Stock Number 5331-01-531-5087, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (CAGE 45681); Daimler Truck North America Llc (CAGE 64678); Oshkosh Defense Llc (CAGE 75Q65) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-531-5087 |
| Primary Part Number | 637974 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters |
| 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 |
|---|---|
| 637974 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters (USA) |
| PH 637974 | Daimler Truck North America Llc (USA) |
| 4199999003 | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 8KK674 | 5/9 Secondary reference Oshkosh Defense Llc |
| 8KK674 | 5/9 Secondary reference Oshkosh Corp |
| 4199999 | 7/2 Vendor item drawing reference Oshkosh Defense Llc |
NSN 5331-01-531-5087 is a O-Ring, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-531-5087 has 3 manufacturer part numbers on file: 637974 (Parker-Hannifin Corporation Dba Pneutronics Div Corporate Headquarters), PH 637974 (Daimler Truck North America Llc), 4199999003 (Oshkosh Defense Llc).
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.