The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-142-4378, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-142-4378 |
| Primary Part Number | 74A650054-2001 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Countersink Angle in Deg | 90.0 |
| FSC Application Data | QUADRANT ASSEMBLY,POWER CONTROL,AFT COCKPIT |
| First Step Diameter | 0.7500 INCHES NOMINAL IN |
| End Diameter | 0.3750 INCHES NOMINAL IN |
| Countersink Diameter | 0.3400 INCHES NOMINAL IN |
| Distance From End to First Step | 0.4860 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | AMS 4640 ASSN STD SINGLE MATERIAL RESPONSE |
| Bore Diameter | 0.2520 INCHES NOMINAL IN |
| Material | COPPER ALLOY 630 |
| 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 |
|---|---|
| 74A650054-2001 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10112730 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5340-01-142-4378 is a Seat,helical Compression Spring, manufactured by The Boeing Company Div Defense, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-142-4378 has 1 manufacturer part number on file: 74A650054-2001 (The Boeing Company Div Defense).
Key specifications for 74A650054-2001: Overall Height: 0.6110 INCHES NOMINAL IN; Countersink Angle in Deg: 90.0; FSC Application Data: QUADRANT ASSEMBLY,POWER CONTROL,AFT COCKPIT; First Step Diameter: 0.7500 INCHES NOMINAL 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.