The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-787-1141, 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 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. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-787-1141 |
| Primary Part Number | MC4190 |
| 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 | VALVE,PLUG 7820007832388 MC2666-1 |
| First Step Diameter | 0.3920 INCHES MINIMUM AND 0.3930 INCHES MAXIMUM IN |
| Material Hardness Rating | 87.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM |
| End Diameter | 0.2000 INCHES NOMINAL IN |
| Distance From End to First Step | 0.0450 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Counterbore Length | 0.2550 INCHES MINIMUM AND 0.2650 INCHES MAXIMUM IN |
| Counterbore Diameter | 0.3100 INCHES NOMINAL IN |
| Bore Diameter | 0.1250 INCHES MINIMUM AND 0.1270 INCHES MAXIMUM 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 |
|---|---|
| MC4190 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace (USA) |
NSN 5340-00-787-1141 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 5340-00-787-1141 has 1 manufacturer part number on file: MC4190 (Eaton Aerospace Llc Dba Sterer Engineering Div M.c.aerospace).
Key specifications for MC4190: Overall Height: 0.4150 INCHES NOMINAL IN; FSC Application Data: VALVE,PLUG 7820007832388 MC2666-1; First Step Diameter: 0.3920 INCHES MINIMUM AND 0.3930 INCHES MAXIMUM IN; Material Hardness Rating: 87.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM. 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.