The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-050-7571, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Essex Industries, Inc. Dba Essex Industries. 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-050-7571 |
| Primary Part Number | A5259 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Essex Industries, Inc. Dba Essex Industries |
| Status | ACTIVE |
| Countersink Angle in Deg | 45.0 |
| First Step Diameter | 0.4300 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN |
| End Diameter | 0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM IN |
| Countersink Diameter | 0.3730 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.1210 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Surface Treatment | ANODIZE |
| Bore Diameter | 0.2480 INCHES MINIMUM AND 0.2520 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | F |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| A5259 PRIMARY | Essex Industries, Inc. Dba Essex Industries (USA) |
NSN 5340-00-050-7571 is a Seat,helical Compression Spring, manufactured by Essex Industries, Inc. Dba Essex Industries, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-050-7571 has 1 manufacturer part number on file: A5259 (Essex Industries, Inc. Dba Essex Industries).
Key specifications for A5259: Overall Height: 0.1600 INCHES MINIMUM AND 0.1800 INCHES MAXIMUM IN; Countersink Angle in Deg: 45.0; First Step Diameter: 0.4300 INCHES MINIMUM AND 0.4360 INCHES MAXIMUM IN; End Diameter: 0.3000 INCHES MINIMUM AND 0.3200 INCHES MAXIMUM 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.