The O-Ring, cataloged under National Stock Number 5331-00-057-2068, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5331-00-057-2068 |
| Primary Part Number | N91-81601CP |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Cross-Sectional Height | 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Center Hole Diameter | 1.599 INCHES MINIMUM AND 1.619 INCHES MAXIMUM IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| N91-81601CP | Naval Inventory Control Point Mechanicsburg (USA) |
| 0XN91-81601CP | Grove Valve Operations (USA) |
| Reference | Meaning |
|---|---|
| 0XN91-81601 | 3/1 Design control — primary reference Grove Valve Operations |
| 5331PL0962581 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 0XN91-81601CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| M83248/1-223 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| N90-81601 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 5331PL1968812 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5331-00-057-2068 is a O-Ring, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5331, O-ring. Status: active.
NSN 5331-00-057-2068 has 2 manufacturer part numbers on file: N91-81601CP (Naval Inventory Control Point Mechanicsburg), 0XN91-81601CP (Grove Valve Operations).
1 possible match (shared part number, not a government interchangeability claim): 5331-00-166-8415. Verify interchangeability with system specifications before substitution.
Key specifications for N91-81601CP: Cross-Sectional Height: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY; Center Hole Diameter: 1.599 INCHES MINIMUM AND 1.619 INCHES MAXIMUM IN; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR. 5 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.