The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-199-4998, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-199-4998 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| Countersink Angle in Deg | 30.0 |
| First Step Diameter | 0.7500 INCHES NOMINAL IN |
| End Diameter | 0.5620 INCHES NOMINAL IN |
| Distance From End to First Step | 0.1250 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | QQ-S-763, CLASS, TYPE A FED SPEC SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.0940 INCHES NOMINAL IN |
| Counterbore Diameter | 0.4450 INCHES MINIMUM AND 0.4500 INCHES MAXIMUM IN |
| Bore Diameter | 0.3730 INCHES MINIMUM AND 0.3740 INCHES MAXIMUM IN |
| Material | STEEL |
| 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 |
|---|---|
| 587-574 | 3/9 Design control — primary reference Hardie-Tynes Co., Inc. |
| 60-587 PIECE 574 | 5/9 Secondary reference Hardie-Tynes Co., Inc. |
NSN 5340-01-199-4998 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-199-4998: Overall Height: 0.1880 INCHES NOMINAL IN; Countersink Angle in Deg: 30.0; First Step Diameter: 0.7500 INCHES NOMINAL IN; End Diameter: 0.5620 INCHES NOMINAL IN. 11 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.