The Retainer,helical Compression Spr, cataloged under National Stock Number 5340-00-172-4304, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Kidde Technologies, Inc Div Kidde Aerospace and Defense. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-172-4304 |
| Primary Part Number | 276906 |
| Item Name | Retainer,helical Compression Spr |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Kidde Technologies, Inc Div Kidde Aerospace and Defense |
| Status | ACTIVE |
| Flange Diameter | 2.130 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | WK520002 33525 MFR REF SINGLE TREATMENT RESPONSE |
| Flange Thickness | 0.019 INCHES NOMINAL IN |
| Body Outside Diameter | 1.035 INCHES MINIMUM AND 1.041 INCHES MAXIMUM IN |
| Style Designator | PARALLEL |
| Material Document and Classification | QQ-S-766, CLASS 321 FED SPEC SINGLE MATERIAL RESPONSE |
| Mounting Hole Diameter | 0.220 INCHES NOMINAL IN |
| Body Inside Diameter | 0.997 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Lip Thickness | 0.019 INCHES NOMINAL IN |
| Bolt Circle Diameter | 1.750 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 321 |
| End Hole Diameter | 0.620 INCHES NOMINAL IN |
| 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 |
|---|---|
| 276906 PRIMARY | Kidde Technologies, Inc Div Kidde Aerospace and Defense (USA) |
| Reference | Meaning |
|---|---|
| 276906 | 5/9 Secondary reference Kidde-Fenwal, Llc |
NSN 5340-00-172-4304 is a Retainer,helical Compression Spr, manufactured by Kidde Technologies, Inc Div Kidde Aerospace and Defense, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-172-4304 has 1 manufacturer part number on file: 276906 (Kidde Technologies, Inc Div Kidde Aerospace and Defense).
Key specifications for 276906: Flange Diameter: 2.130 INCHES NOMINAL IN; Overall Height: 0.375 INCHES NOMINAL IN; Surface Treatment Document and Classification: WK520002 33525 MFR REF SINGLE TREATMENT RESPONSE; Flange Thickness: 0.019 INCHES NOMINAL IN. 14 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.