The O-Ring, cataloged under National Stock Number 5331-01-218-4931, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-218-4931 |
| Primary Part Number | ST2283-018 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Material Document and Classification | PWA 370 MFR REF SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN |
| Material | RUBBER |
| 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 |
|---|---|
| ST2283-018 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| ST2283-018 | 5/9 Secondary reference Richmond Lox Equipment Co Sub of Richmond Tank Car Co |
NSN 5331-01-218-4931 is a O-Ring, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-218-4931 has 1 manufacturer part number on file: ST2283-018 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for ST2283-018: Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Material Document and Classification: PWA 370 MFR REF SINGLE MATERIAL RESPONSE; Center Hole Diameter: 0.730 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN; Material: RUBBER. 4 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.