The O-Ring, cataloged under National Stock Number 5331-00-599-0874, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Honeywell International Inc. Div Aerospace - Torrance. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-00-599-0874 |
| Primary Part Number | S9121M61 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Honeywell International Inc. Div Aerospace - Torrance |
| Status | ACTIVE |
| Cross-Sectional Height | 0.035 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN |
| Center Hole Diameter | 1.970 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| S9121M61 PRIMARY | Honeywell International Inc. Div Aerospace - Torrance (USA) |
| S9121M61 | Proponent, Inc. Dba Proponent (USA) |
| Reference | Meaning |
|---|---|
| 87321-1 | C/1 Advisory reference — outside the item-of-supply concept Honeywell International Inc. Div Aerospace - Torrance |
| 87321-1 | 5/9 Secondary reference Alliedsignal Inc Dba Allied-Signal Aerospace Co |
NSN 5331-00-599-0874 is a O-Ring, manufactured by Honeywell International Inc. Div Aerospace - Torrance, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-599-0874 has 2 manufacturer part numbers on file: S9121M61 (Honeywell International Inc. Div Aerospace - Torrance), S9121M61 (Proponent, Inc. Dba Proponent).
1 possible match (shared part number, not a government interchangeability claim): 8440-01-654-4707. Verify interchangeability with system specifications before substitution.
Key specifications for S9121M61: Cross-Sectional Height: 0.035 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN; Center Hole Diameter: 1.970 INCHES MINIMUM AND 1.990 INCHES MAXIMUM IN; Material: RUBBER SYNTHETIC. 3 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.