The O-Ring, cataloged under National Stock Number 5331-01-537-3078, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Tyco Fire Products Lp. 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 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-537-3078 |
| Primary Part Number | 42252 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Tyco Fire Products Lp |
| Status | ACTIVE |
| Cross-Sectional Height | 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.419 INCHES MINIMUM AND 0.429 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 |
|---|---|
| 29825N ITEM NO 23 | Tyco Fire Products Lp (USA) |
| 42252 PRIMARY | Tyco Fire Products Lp (USA) |
NSN 5331-01-537-3078 is a O-Ring, manufactured by Tyco Fire Products Lp, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-537-3078 has 2 manufacturer part numbers on file: 29825N ITEM NO 23 (Tyco Fire Products Lp), 42252 (Tyco Fire Products Lp).
2 possible matches (shared part number, not a government interchangeability claim): 5995-01-574-6136, 5330-01-582-5566. Verify interchangeability with system specifications before substitution.
Key specifications for 42252: Cross-Sectional Height: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN; Center Hole Diameter: 0.419 INCHES MINIMUM AND 0.429 INCHES MAXIMUM IN; End Item Identification: SWITCH ASSEMBLY,PRESSURE OPERATED; 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.