The O-Ring, cataloged under National Stock Number 5331-01-540-4573, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Core Industries Inc. Dba Mueller Steam Specialty. Government technical data includes 1 specification, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-540-4573 |
| Primary Part Number | 4-51-I-H-H-3-5-O-RING,SEAT |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Core Industries Inc. Dba Mueller Steam Specialty |
| Status | ACTIVE |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| 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 |
|---|---|
| 4-51-I-H-H-3-5-O-RING,SEAT PRIMARY | Core Industries Inc. Dba Mueller Steam Specialty (USA) |
NSN 5331-01-540-4573 is a O-Ring, manufactured by Core Industries Inc. Dba Mueller Steam Specialty, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-540-4573 has 1 manufacturer part number on file: 4-51-I-H-H-3-5-O-RING,SEAT (Core Industries Inc. Dba Mueller Steam Specialty).
Key specifications for 4-51-I-H-H-3-5-O-RING,SEAT: Special Features: THIS ITEM IS REFERENCED BY NO 10 ON THE MUELLER STEAM SPECIALTY VALVES PRICE LIST; Part Name Assigned by Controlling Agency: SEAT O-RING; End Item Identification: VALVE,BUTTERFLY,4.0 IN IN; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR. 1 specification is 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.