The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-509-9178, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Honeywell International Inc. Div Aerospace - Torrance. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5340-00-509-9178 |
| Primary Part Number | 56872 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Honeywell International Inc. Div Aerospace - Torrance |
| Status | ACTIVE |
| First Step Diameter | 0.5550 INCHES NOMINAL IN |
| End Diameter | 0.4400 INCHES NOMINAL IN |
| Second End Diameter | 0.3650 INCHES NOMINAL IN |
| Distance From End to First Step | 0.1380 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | SAE 1020 ASSN STD SINGLE MATERIAL RESPONSE |
| First Step Length | 0.0620 INCHES NOMINAL IN |
| Bore Diameter | 0.1575 INCHES NOMINAL IN |
| Material | STEEL COMP 1020 |
| 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 |
|---|---|
| 56872 PRIMARY | Honeywell International Inc. Div Aerospace - Torrance (USA) |
| Reference | Meaning |
|---|---|
| 56872 | 5/9 Secondary reference Alliedsignal Inc Dba Allied-Signal Aerospace Co |
NSN 5340-00-509-9178 is a Seat,helical Compression Spring, manufactured by Honeywell International Inc. Div Aerospace - Torrance, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-509-9178 has 1 manufacturer part number on file: 56872 (Honeywell International Inc. Div Aerospace - Torrance).
1 possible match (shared part number, not a government interchangeability claim): 1630-01-332-5498. Verify interchangeability with system specifications before substitution.
Key specifications for 56872: Overall Height: 0.2450 INCHES NOMINAL IN; First Step Diameter: 0.5550 INCHES NOMINAL IN; End Diameter: 0.4400 INCHES NOMINAL IN; Second End Diameter: 0.3650 INCHES NOMINAL IN. 10 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.