The Seal,plain, cataloged under National Stock Number 5330-01-054-0853, is classified within Federal Supply Class 5330 (Packing and Gasket Materials) of the Hardware and Abrasives group. The manufacturer of record is Bal Seal Engineering, Inc.. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5330-01-054-0853 |
| Primary Part Number | X218481 |
| Item Name | Seal,plain |
| FSC / FSG | 5330 / 53 — Packing and Gasket Materials |
| Manufacturer | Bal Seal Engineering, Inc. |
| Status | ACTIVE |
| Seal Width | 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 3650 MIL SPEC SINGLE MATERIAL RESPONSE SEALING ELEMENT |
| Material Document and Classification | QQ-W-423,TYPE 302 MIL SPEC SINGLE MATERIAL RESPONSE SPRING |
| Cross-Sectional Shape Style | C-SECTION W/ HELICAL SPRING |
| Accommodated Shaft Diameter | 0.369 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN |
| Material | STEEL SPRING |
| Material | PLASTIC POLYCHLOROTRIFLUOROETHYLENE SEALING ELEMENT |
| Construction | TWO-PIECE |
| 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 |
|---|---|
| 651-077-9201 | Proponent, Inc. Dba Proponent (USA) |
| X218481 PRIMARY | Bal Seal Engineering, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 304-110 | 3/9 Design control — primary reference Bal Seal Engineering, Inc. |
| 651-077-9201 | 7/2 Vendor item drawing reference Honeywell International Inc. Div Aerospace - Torrance |
NSN 5330-01-054-0853 is a Seal,plain, manufactured by Bal Seal Engineering, Inc., classified under FSC 5330, Packing and Gasket Materials. Status: active.
NSN 5330-01-054-0853 has 2 manufacturer part numbers on file: 651-077-9201 (Proponent, Inc. Dba Proponent), X218481 (Bal Seal Engineering, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 6650-01-091-8807, 6515-01-510-2578. Verify interchangeability with system specifications before substitution.
Key specifications for X218481: Seal Width: 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Material Document and Classification: AMS 3650 MIL SPEC SINGLE MATERIAL RESPONSE SEALING ELEMENT; Material Document and Classification: QQ-W-423,TYPE 302 MIL SPEC SINGLE MATERIAL RESPONSE SPRING; Cross-Sectional Shape Style: C-SECTION W/ HELICAL SPRING. 8 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.