The Seal Assembly, cataloged under National Stock Number 5330-00-003-1905, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5330-00-003-1905 |
| Primary Part Number | 645371-240 |
| Item Name | Seal Assembly |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| General Characteristics Item Description | SEAL,POLYTETRAFLUOROETHYLENE,SPRING,STEEL,3.743 IN. MIN,3.757 IN. MAX ID,4.083 IN. MIN,4.127 IN MAX OD,0.165 IN. MIN,0.185 IN. MAX WIDTH 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 |
|---|---|
| 645371-240 PRIMARY | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 645371-240 | 5/2 Secondary reference U.S. Government activity |
NSN 5330-00-003-1905 is a Seal Assembly, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-00-003-1905 has 1 manufacturer part number on file: 645371-240 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 645371-240: General Characteristics Item Description: SEAL,POLYTETRAFLUOROETHYLENE,SPRING,STEEL,3.743 IN. MIN,3.757 IN. MAX ID,4.083 IN. MIN,4.127 IN MAX OD,0.165 IN. MIN,0.185 IN. MAX WIDTH IN. 1 specification is 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.