The O-Ring, cataloged under National Stock Number 5331-01-073-0189, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Sohmer and Co Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-01-073-0189 |
| Primary Part Number | 55810 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Sohmer and Co Inc |
| Status | ACTIVE |
| Cross-Sectional Height | 1.520 INCHES MINIMUM AND 1.680 INCHES MAXIMUM IN |
| Center Hole Diameter | 36.800 INCHES MINIMUM AND 37.400 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 55810 PRIMARY | Sohmer and Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 55810 | 5/9 Secondary reference Compair Kellogg Div of Robertshaw Controls Co |
| 55810 | 5/9 Secondary reference Leroi International Inc Dba Compair Leroi |
| 55810 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5331-01-073-0189 is a O-Ring, manufactured by Sohmer and Co Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-073-0189 has 1 manufacturer part number on file: 55810 (Sohmer and Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 6150-01-499-7694. Verify interchangeability with system specifications before substitution.
Key specifications for 55810: Cross-Sectional Height: 1.520 INCHES MINIMUM AND 1.680 INCHES MAXIMUM IN; Center Hole Diameter: 36.800 INCHES MINIMUM AND 37.400 INCHES MAXIMUM IN. 2 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.