The Gasket, cataloged under National Stock Number 5330-01-391-4338, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Isometrics Inc. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5330-01-391-4338 |
| Primary Part Number | 277A-35 |
| Item Name | Gasket |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Isometrics Inc |
| Status | ACTIVE |
| Cross-Sectional Thickness | 0.063 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Gasket Center to Flat Distance | 2.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | SOLID SINGLE OR COMPOSITION |
| Aperture Diameter | 2.750 INCHES NOMINAL IN |
| Bolt Hole Quantity | 3 |
| Bolt Circle Diameter | 4.000 INCHES NOMINAL IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL |
| Gasket Center to Second Flat Distance | 2.000 INCHES NOMINAL IN |
| Hole Diameter | 0.313 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 277A-35 PRIMARY | Isometrics Inc (USA) |
NSN 5330-01-391-4338 is a Gasket, manufactured by Isometrics Inc, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-391-4338 has 1 manufacturer part number on file: 277A-35 (Isometrics Inc).
Key specifications for 277A-35: Cross-Sectional Thickness: 0.063 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Gasket Center to Flat Distance: 2.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: SOLID SINGLE OR COMPOSITION; Aperture Diameter: 2.750 INCHES NOMINAL IN. 9 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.