The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-436-5016, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 14 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-436-5016 |
| Primary Part Number | 65652-11255-104 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| First Step Diameter | 0.4350 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN |
| Material Hardness Rating | 56.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM |
| End Diameter | 0.4000 INCHES MINIMUM AND 0.4200 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.0900 INCHES MINIMUM AND 0.1100 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.0850 INCHES MINIMUM AND 0.0950 INCHES MAXIMUM IN |
| Second Step Diameter | 0.5900 INCHES MINIMUM AND 0.6100 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.4100 INCHES MINIMUM AND 0.4200 INCHES MAXIMUM IN |
| First Step Length | 0.0650 INCHES MINIMUM AND 0.0950 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 0.3120 INCHES MINIMUM AND 0.3140 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 65652-11255-104 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
NSN 5340-00-436-5016 is a Seat,helical Compression Spring, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-436-5016 has 1 manufacturer part number on file: 65652-11255-104 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for 65652-11255-104: Overall Height: 0.3500 INCHES MINIMUM AND 0.3600 INCHES MAXIMUM IN; First Step Diameter: 0.4350 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN; Material Hardness Rating: 56.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM; End Diameter: 0.4000 INCHES MINIMUM AND 0.4200 INCHES MAXIMUM IN. 14 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.