The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-018-6136, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Chase International (contract Services) Ltd. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-018-6136 |
| Primary Part Number | 351-50570 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Chase International (contract Services) Ltd |
| Status | ACTIVE |
| First Step Diameter | 1.0870 INCHES NOMINAL IN |
| End Diameter | 0.8600 INCHES NOMINAL IN |
| Distance From End to First Step | 0.2100 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Features Provided | CASEHARDENED |
| Second Step Diameter | 1.4300 INCHES NOMINAL IN |
| Bore Taper in Deg | 6.0 |
| First Step Length | 0.1050 INCHES NOMINAL IN |
| Chamfer Angle in Deg | 15.0 |
| Bore Diameter | 0.5820 INCHES NOMINAL 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 |
|---|---|
| 351-50570 | Chase International (contract Services) Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 351-50570 | 3/9 Design control — primary reference Astec America Inc. |
| 351-50570 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 5340-01-018-6136 is a Seat,helical Compression Spring, manufactured by Chase International (contract Services) Ltd, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-018-6136 has 1 manufacturer part number on file: 351-50570 (Chase International (contract Services) Ltd).
Key specifications for 351-50570: Overall Height: 0.4420 INCHES NOMINAL IN; First Step Diameter: 1.0870 INCHES NOMINAL IN; End Diameter: 0.8600 INCHES NOMINAL IN; Distance From End to First Step: 0.2100 INCHES NOMINAL IN. 12 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.