The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-941-9614, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 12 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-941-9614 |
| Primary Part Number | 520577 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| FSC Application Data | AIRCRAFT ENGINE FUEL CONTROL |
| First Step Diameter | 0.7870 INCHES MINIMUM AND 0.7910 INCHES MAXIMUM IN |
| End Diameter | 0.1850 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN |
| Seat Angle in Deg | 45.0 |
| Third Step Diameter | 0.9750 INCHES MINIMUM AND 0.9790 INCHES MAXIMUM IN |
| Distance From End to First Step | 0.6730 INCHES MINIMUM AND 0.6830 INCHES MAXIMUM IN |
| Design Type | SOLID |
| Second Step Length | 0.0850 INCHES MINIMUM AND 0.0950 INCHES MAXIMUM IN |
| Second Step Diameter | 0.8920 INCHES MINIMUM AND 0.8980 INCHES MAXIMUM IN |
| First Step Length | 0.1820 INCHES MINIMUM AND 0.1920 INCHES MAXIMUM IN |
| Chamfer Angle in Deg | 45.0 |
| 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 | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| 520577 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 5340-00-941-9614 is a Seat,helical Compression Spring, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-941-9614 has 1 manufacturer part number on file: 520577 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-594-6274. Verify interchangeability with system specifications before substitution.
Key specifications for 520577: Overall Height: 1.2300 INCHES MINIMUM AND 1.2500 INCHES MAXIMUM IN; FSC Application Data: AIRCRAFT ENGINE FUEL CONTROL; First Step Diameter: 0.7870 INCHES MINIMUM AND 0.7910 INCHES MAXIMUM IN; End Diameter: 0.1850 INCHES MINIMUM AND 0.1900 INCHES MAXIMUM IN. 12 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.