The O-Ring, cataloged under National Stock Number 5331-01-577-2300, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is George W Kistler Inc Dba Kistler-Obrien Fire Protection. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-01-577-2300 |
| Primary Part Number | 55531 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | George W Kistler Inc Dba Kistler-Obrien Fire Protection |
| Status | ACTIVE |
| Cross-Sectional Height | 0.070 INCHES NOMINAL IN |
| Hardness Rating | 70.0 SHORE DUROMETER A NOMINAL |
| Center Hole Diameter | 0.208 INCHES NOMINAL IN |
| 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 |
|---|---|
| 55531 | George W Kistler Inc Dba Kistler-Obrien Fire Protection (USA) |
| Reference | Meaning |
|---|---|
| 55531 | 3/9 Design control — primary reference Pyro-Chem Inc Div of Baker Industries Inc Sub of Borg-Warner Corp |
NSN 5331-01-577-2300 is a O-Ring, manufactured by George W Kistler Inc Dba Kistler-Obrien Fire Protection, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-577-2300 has 1 manufacturer part number on file: 55531 (George W Kistler Inc Dba Kistler-Obrien Fire Protection).
Key specifications for 55531: Cross-Sectional Height: 0.070 INCHES NOMINAL IN; Hardness Rating: 70.0 SHORE DUROMETER A NOMINAL; Center Hole Diameter: 0.208 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: ACTUATOR ASSEMBLY O-RING. 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.