The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-172-9501, 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 18 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 | 5340-01-172-9501 |
| Primary Part Number | MC15909 |
| 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 |
| Countersink Angle in Deg | 45.0 |
| FSC Application Data | ACFT HYD SYSTEM |
| First Step Diameter | 0.3800 INCHES NOMINAL IN |
| Material Hardness Rating | 77.7 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 82.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| End Diameter | 0.2330 INCHES NOMINAL IN |
| Seat Angle in Deg | 30.0 |
| Distance From End to First Step | 0.0590 INCHES NOMINAL IN |
| Design Type | SOLID |
| Second Step Length | 0.0710 INCHES NOMINAL IN |
| Style Designator | SEAT |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.2610 INCHES NOMINAL IN |
| Second Step Diameter | 0.5000 INCHES NOMINAL IN |
| Bore Taper in Deg | 45.0 |
| First Step Length | 0.0600 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Bore Diameter | 0.0630 INCHES NOMINAL IN |
| Material | STEEL COMP 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 |
|---|---|
| MC15909 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace (USA) |
NSN 5340-01-172-9501 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 5340-01-172-9501 has 1 manufacturer part number on file: MC15909 (Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace).
Key specifications for MC15909: Overall Height: 0.3200 INCHES NOMINAL IN; Countersink Angle in Deg: 45.0; FSC Application Data: ACFT HYD SYSTEM; First Step Diameter: 0.3800 INCHES NOMINAL IN. 18 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.