The Retainer,helical Compression Spr, cataloged under National Stock Number 5340-01-357-0681, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Senior Operations Llc Dba Metal Bellows Div Metal Bellows. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-01-357-0681 |
| Primary Part Number | 87770 |
| Item Name | Retainer,helical Compression Spr |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Senior Operations Llc Dba Metal Bellows Div Metal Bellows |
| Status | ACTIVE |
| Flange Diameter | 4.500 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| Flange Thickness | 0.032 INCHES NOMINAL IN |
| Body Outside Diameter | 3.835 INCHES MINIMUM AND 3.845 INCHES MAXIMUM IN |
| Style Designator | IRREGULAR |
| Material Document and Classification | AMS 5510, SAE 30321 ASSN STD SINGLE MATERIAL RESPONSE |
| Body Inside Diameter | 3.781 INCHES NOMINAL IN |
| Casehardening Indicator | NOT CASEHARDENED |
| Surface Treatment | PASSIVATE |
| Material | STEEL COMP 321 |
| 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 |
|---|---|
| 87770 PRIMARY | Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA) |
| Reference | Meaning |
|---|---|
| 87770 | 3/9 Design control — primary reference Senior Flexonics Inc |
NSN 5340-01-357-0681 is a Retainer,helical Compression Spr, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-357-0681 has 1 manufacturer part number on file: 87770 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows).
Key specifications for 87770: Flange Diameter: 4.500 INCHES NOMINAL IN; Overall Height: 3.000 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE; Flange Thickness: 0.032 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.