The O-Ring, cataloged under National Stock Number 5331-01-137-6903, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Alfa Laval Inc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Alfa Laval Inc (CAGE 71871); Hutchinson Seal De Mexico Stillman Seal Division Div Stillman Seal,jpr,espa (CAGE SW461) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-137-6903 |
| Primary Part Number | 52564301 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Alfa Laval Inc |
| 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 |
|---|---|
| 52564301 PRIMARY | Alfa Laval Inc (USA) |
| 3019T29P21 | Hutchinson Seal De Mexico Stillman Seal Division Div Stillman Seal,jpr,espa (MEX) |
| Reference | Meaning |
|---|---|
| 52564301 | 5/9 Secondary reference Peck Purifier Sales Co |
| 525643-1 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 3019T29P21 | 5/9 Secondary reference Jonal Laboratories Inc |
| 3019T29P21 | 5/9 Secondary reference U.S. Government activity |
| E-8709935 PIECE 89 | 5/9 Secondary reference Alfa Laval Inc |
| 525643-01 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 3019T29P21 | 5/9 Secondary reference Thermonetics Corp |
| 3019T29P21 | 5/9 Secondary reference Heligear Canada Acquisitioncorporationdba Northstar Aerospace Inc (milton) |
NSN 5331-01-137-6903 is a O-Ring, manufactured by Alfa Laval Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-137-6903 has 2 manufacturer part numbers on file: 52564301 (Alfa Laval Inc), 3019T29P21 (Hutchinson Seal De Mexico Stillman Seal Division Div Stillman Seal,jpr,espa).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-140-3095. 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.