The O-Ring, cataloged under National Stock Number 5331-01-550-2131, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Thermal Engineering International (usa) Inc.. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | Thermal Engineering International (usa) Inc. (CAGE 1MME1) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-550-2131 |
| Primary Part Number | 03D-009-B12 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Thermal Engineering International (usa) 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 |
|---|---|
| 03D-009-D01 ITEM 13 | Thermal Engineering International (usa) Inc. (USA) |
| 03D-009-B12 PRIMARY | Thermal Engineering International (usa) Inc. (USA) |
| Reference | Meaning |
|---|---|
| 03D-009-B12 | 5/9 Secondary reference Thermal Engineering International Usa Inc |
| 03D-009-D01 | D/9 Drawing number reference only Thermal Engineering International (usa) Inc. |
| 03D-009-D01 ITEM 13 | 5/9 Secondary reference Thermal Engineering International Usa Inc |
NSN 5331-01-550-2131 is a O-Ring, manufactured by Thermal Engineering International (usa) Inc., classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-550-2131 has 2 manufacturer part numbers on file: 03D-009-D01 ITEM 13 (Thermal Engineering International (usa) Inc.), 03D-009-B12 (Thermal Engineering International (usa) Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 5331-01-550-2140, 5331-01-550-2155, 5331-01-550-2163. 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.