The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-224-1153, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Itt Aerospace Controls Llc Dba Itt Aerospace Controls Unit S. Government technical data includes 13 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 | 5340-01-224-1153 |
| Primary Part Number | 40939A |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Itt Aerospace Controls Llc Dba Itt Aerospace Controls Unit S |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT HYDRAULIC VACUUM,DEICING SYSTEMS |
| First Step Diameter | 0.6550 INCHES NOMINAL IN |
| End Diameter | 0.4650 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.1725 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | AISI 416 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.1450 INCHES NOMINAL IN |
| Counterbore Diameter | 0.2365 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 0.1910 INCHES NOMINAL IN |
| Material | STEEL COMP 416 |
| 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 |
|---|---|
| 40939A PRIMARY | Itt Aerospace Controls Llc Dba Itt Aerospace Controls Unit S (USA) |
NSN 5340-01-224-1153 is a Seat,helical Compression Spring, manufactured by Itt Aerospace Controls Llc Dba Itt Aerospace Controls Unit S, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-224-1153 has 1 manufacturer part number on file: 40939A (Itt Aerospace Controls Llc Dba Itt Aerospace Controls Unit S).
Key specifications for 40939A: Overall Height: 0.2350 INCHES NOMINAL IN; FSC Application Data: AIRCRAFT HYDRAULIC VACUUM,DEICING SYSTEMS; First Step Diameter: 0.6550 INCHES NOMINAL IN; End Diameter: 0.4650 INCHES NOMINAL IN. 13 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.