The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-319-4911, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-319-4911 |
| Primary Part Number | 2121381 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Material Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM |
| End Diameter | 0.6090 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35, TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE |
| Design Type | SOLID |
| Material Document and Classification | AISI 630 17-4PH, UNS S17400 ASSN STD SINGLE MATERIAL RESPONSE |
| Second Step Diameter | 0.8670 INCHES MINIMUM AND 0.8700 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 630 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 2121381 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 5340PL0890550 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5340-01-319-4911 is a Seat,helical Compression Spring, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-319-4911 has 1 manufacturer part number on file: 2121381 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 2121381: Overall Height: 2.2500 INCHES NOMINAL IN; Material Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM; End Diameter: 0.6090 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35, TYPE 2 FED SPEC SINGLE TREATMENT RESPONSE. 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.