The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-139-7420, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-139-7420 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Countersink Angle in Deg | 80.0 |
| First Step Diameter | 0.6600 INCHES MINIMUM AND 0.6650 INCHES MAXIMUM IN |
| Countersink Diameter | 0.1300 INCHES MINIMUM AND 0.1500 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.1420 INCHES MINIMUM AND 0.1480 INCHES MAXIMUM IN |
| Style Designator | SEAT |
| Material Document and Classification | AMS 5640 ASSN STD SINGLE MATERIAL RESPONSE |
| Chamfer Angle in Deg | 32.0 |
| Bore Diameter | 0.1100 INCHES MINIMUM AND 0.1200 INCHES MAXIMUM IN |
| Material | STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X |
| 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 |
|---|---|
| 10158976 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 2010T11P01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5340-01-139-7420 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-139-7420: Overall Height: 0.2000 INCHES MINIMUM AND 0.2100 INCHES MAXIMUM IN; Countersink Angle in Deg: 80.0; First Step Diameter: 0.6600 INCHES MINIMUM AND 0.6650 INCHES MAXIMUM IN; Countersink Diameter: 0.1300 INCHES MINIMUM AND 0.1500 INCHES MAXIMUM 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.