The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-187-3365, 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 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 | 5340-01-187-3365 |
| Primary Part Number | RD34733 |
| 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 |
| Countersink Angle in Deg | 40.0 |
| First Step Diameter | 0.9960 INCHES MINIMUM AND 1.0030 INCHES MAXIMUM IN |
| End Diameter | 0.6150 INCHES MINIMUM AND 0.6200 INCHES MAXIMUM IN |
| Countersink Diameter | 0.0940 INCHES MINIMUM AND 0.1090 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.9000 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | QQ-A-200/8, 6061, T6 FED SPEC SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.6570 INCHES MINIMUM AND 0.6620 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.0050 INCHES NOMINAL IN |
| Chamfer Angle in Deg | 30.0 |
| Spherical Seat Top Radius | 0.0050 INCHES MINIMUM AND 0.0150 INCHES MAXIMUM IN |
| Bore Diameter | 0.5100 INCHES MINIMUM AND 0.5150 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 6061 |
| 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 |
|---|---|
| RD34733 PRIMARY | Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec (USA) |
NSN 5340-01-187-3365 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 5340-01-187-3365 has 1 manufacturer part number on file: RD34733 (Hydro-Aire Aerospace Corp. Dba Lear Romec Div Lear Romec).
Key specifications for RD34733: Overall Height: 1.1500 INCHES NOMINAL IN; Countersink Angle in Deg: 40.0; First Step Diameter: 0.9960 INCHES MINIMUM AND 1.0030 INCHES MAXIMUM IN; End Diameter: 0.6150 INCHES MINIMUM AND 0.6200 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.