The O-Ring, cataloged under National Stock Number 5331-01-309-3625, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Flywheel Supply Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Flywheel Supply Llc (CAGE 833H8) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-309-3625 |
| Primary Part Number | R53 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Flywheel Supply Llc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| R53 PRIMARY | Flywheel Supply Llc (USA) |
| Reference | Meaning |
|---|---|
| 104-A DET 7 | 5/9 Secondary reference Essex Brass Corporation |
NSN 5331-01-309-3625 is a O-Ring, manufactured by Flywheel Supply Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-309-3625 has 1 manufacturer part number on file: R53 (Flywheel Supply Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-441-9416, 5330-01-471-2488. Verify interchangeability with system specifications before substitution.
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.