The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-809-8053, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 11 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-809-8053 |
| Primary Part Number | 718979-1 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Countersink Angle in Deg | 90.0 |
| First Step Diameter | 0.3900 INCHES MINIMUM AND 0.4000 INCHES MAXIMUM IN |
| Material Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM |
| Countersink Diameter | 0.1350 INCHES MINIMUM AND 0.1500 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.1420 INCHES MINIMUM AND 0.1460 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Diameter | 0.2173 INCHES MINIMUM AND 0.2193 INCHES MAXIMUM IN |
| Chamfer Angle in Deg | 23.0 |
| Bore Diameter | 0.1020 INCHES MINIMUM AND 0.1030 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 |
| Part Number | Manufacturer |
|---|---|
| 718979-1 PRIMARY | Hamilton Sundstrand Corporation Dba Collins Aerospace (USA) |
NSN 5340-00-809-8053 is a Seat,helical Compression Spring, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-809-8053 has 1 manufacturer part number on file: 718979-1 (Hamilton Sundstrand Corporation Dba Collins Aerospace).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-343-6611. Verify interchangeability with system specifications before substitution.
Key specifications for 718979-1: Overall Height: 0.1900 INCHES NOMINAL IN; Countersink Angle in Deg: 90.0; First Step Diameter: 0.3900 INCHES MINIMUM AND 0.4000 INCHES MAXIMUM IN; Material Hardness Rating: 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM. 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.