The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-979-8581, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec. Government technical data includes 9 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 | 5340-00-979-8581 |
| Primary Part Number | RB17529 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec |
| Status | ACTIVE |
| FSC Application Data | VALVE,SAFETY RELIEF |
| First Step Diameter | 0.4980 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN |
| End Diameter | 0.3500 INCHES NOMINAL IN |
| Distance From End to First Step | 0.1250 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | AMS 5610 ASSN STD SINGLE MATERIAL RESPONSE |
| First Step Length | 0.0630 INCHES MINIMUM AND 0.0670 INCHES MAXIMUM IN |
| Material | STEEL COMP 416SE |
| 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 |
|---|---|
| RB17529 PRIMARY | Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec (USA) |
NSN 5340-00-979-8581 is a Seat,helical Compression Spring, manufactured by Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-979-8581 has 1 manufacturer part number on file: RB17529 (Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec).
Key specifications for RB17529: Overall Height: 0.3440 INCHES NOMINAL IN; FSC Application Data: VALVE,SAFETY RELIEF; First Step Diameter: 0.4980 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN; End Diameter: 0.3500 INCHES NOMINAL IN. 9 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.