The O-Ring, cataloged under National Stock Number 5331-00-937-1333, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Burke Industries Purosil Div. Government technical data includes 6 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through both NSN and commercial part number lookups. 15 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 5331-00-937-1333 |
| Primary Part Number | H733-4-326 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Burke Industries Purosil Div |
| Status | ACTIVE |
| Temp Rating | -100.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF |
| Cross-Sectional Height | 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN |
| Hardness Rating | 60.0 SHORE DUROMETER A NOMINAL |
| Elongation Percentage | 125 MAXIMUM |
| Center Hole Diameter | 1.585 INCHES MINIMUM AND 1.615 INCHES MAXIMUM IN |
| Material | RUBBER FLUOROSILICONE CLASS FQ |
| 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 |
|---|---|
| H733-4-326 | Burke Industries Purosil Div (USA) |
| Reference | Meaning |
|---|---|
| 11-326-8450-60 | 5/9 Secondary reference U.S. Government activity |
| 2-326L449-6 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| MIL-DTL-25988/3 | 4/1 Identification reference U.S. Government activity |
| PRP326-11646 | 5/9 Secondary reference Parker Hannifin Corporation Div O-Ring Division |
| M25988/3-326 | 2/2 Government specification standardization U.S. Government activity |
| 2-326L946-60 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| MIL-DTL-25988 | 5/9 Secondary reference U.S. Government activity |
| C007-326 | 5/1 Secondary reference U.S. Government activity |
| 2-326L1223-60 | 5/1 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
| 2-326L449-6 | 5/9 Secondary reference U.S. Government activity |
| PRP568-326-1133-60 | 5/9 Secondary reference Parco, Llc |
| B63115-326 | 5/9 Secondary reference Parco, Llc |
| 326-11646 | 5/9 Secondary reference Parker Hannifin Corporation Div O-Ring Division |
| AA326TH1047 | 5/9 Secondary reference U.S. Government activity |
| 2-326 L449-65 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 5331-00-937-1333 is a O-Ring, manufactured by Burke Industries Purosil Div, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-937-1333 has 1 manufacturer part number on file: H733-4-326 (Burke Industries Purosil Div).
3 possible matches (shared part number, not a government interchangeability claim): 5331-01-129-2007, 5331-01-189-8269, 5331-01-598-4744. Verify interchangeability with system specifications before substitution.
Key specifications for H733-4-326: Temp Rating: -100.0 FAHRENHEIT AND 350.0 FAHRENHEIT DEGF; Cross-Sectional Height: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN; Hardness Rating: 60.0 SHORE DUROMETER A NOMINAL; Elongation Percentage: 125 MAXIMUM. 6 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.