The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-309-4387, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-309-4387 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 3.4930 INCHES MINIMUM AND 3.4970 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Material Document and Classification | QQ-S-633, COMP 1018 FED SPEC SINGLE MATERIAL RESPONSE |
| Spherical Seat Top Radius | 1.7485 INCHES NOMINAL IN |
| Bore Diameter | 3.2540 INCHES MINIMUM AND 3.2590 INCHES MAXIMUM IN |
| Material | STEEL COMP 1018 |
| 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 |
| Reference | Meaning |
|---|---|
| 101A263AY PIECE 1 | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
| 125D808AC PIECE 12 | 5/9 Secondary reference General Electric Co Naval and Drive Turbine Systems Dept |
NSN 5340-01-309-4387 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-309-4387: Overall Height: 0.4380 INCHES NOMINAL IN; First Step Diameter: 3.4930 INCHES MINIMUM AND 3.4970 INCHES MAXIMUM IN; Design Type: SOLID; Material Document and Classification: QQ-S-633, COMP 1018 FED SPEC SINGLE MATERIAL RESPONSE. 6 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.