The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-172-9500, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace. 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 | 5340-01-172-9500 |
| Primary Part Number | MC15919 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace |
| Status | ACTIVE |
| FSC Application Data | ACFT HYD SYSTEM |
| First Step Diameter | 0.5100 INCHES NOMINAL IN |
| Material Hardness Rating | 77.7 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 82.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| End Diameter | 0.3350 INCHES NOMINAL IN |
| Distance From End to First Step | 0.0470 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Length | 0.0640 INCHES NOMINAL IN |
| Second Step Diameter | 0.6500 INCHES NOMINAL IN |
| Counterbore Diameter | 0.4000 INCHES NOMINAL IN |
| First Step Length | 0.0550 INCHES NOMINAL IN |
| Bore Diameter | 0.2640 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| MC15919 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace (USA) |
NSN 5340-01-172-9500 is a Seat,helical Compression Spring, manufactured by Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-172-9500 has 1 manufacturer part number on file: MC15919 (Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace).
Key specifications for MC15919: Overall Height: 0.1700 INCHES NOMINAL IN; FSC Application Data: ACFT HYD SYSTEM; First Step Diameter: 0.5100 INCHES NOMINAL IN; Material Hardness Rating: 77.7 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 82.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM. 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.