The O-Ring, cataloged under National Stock Number 5331-01-138-3130, 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 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-138-3130 |
| Primary Part Number | 4215100 |
| 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) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 4215100 PRIMARY | Alfa Laval Inc (USA) |
| Reference | Meaning |
|---|---|
| 42151 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 42151Y | 5/9 Secondary reference Alfa Laval Inc |
| 10029290 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5331-01-138-3130 is a O-Ring, manufactured by Alfa Laval Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-138-3130 has 1 manufacturer part number on file: 4215100 (Alfa Laval Inc).
1 possible match (shared part number, not a government interchangeability claim): 2520-01-354-8028. 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.