The Seat,helical Compression Spring, cataloged under National Stock Number 5340-00-391-3320, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5340-00-391-3320 |
| Primary Part Number | 220812A |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Countersink Angle in Deg | 45.0 |
| First Step Diameter | 0.8750 INCHES NOMINAL IN |
| End Diameter | 0.6410 INCHES MINIMUM AND 0.6460 INCHES MAXIMUM IN |
| Countersink Diameter | 0.5940 INCHES NOMINAL IN |
| Distance From End to First Step | 0.3930 INCHES NOMINAL IN |
| Design Type | SPLIT |
| Style Designator | SEAT |
| Material Document and Classification | SAE 1113 ASSN STD SINGLE MATERIAL RESPONSE |
| Features Provided | CASEHARDENED |
| Bore Diameter | 0.3590 INCHES NOMINAL IN |
| Material | STEEL COMP 1213 |
| 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 |
|---|---|
| 220812A PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| AB0070864430 | Brighton Cromwell Llc (USA) |
| Reference | Meaning |
|---|---|
| 220812A | 5/9 Secondary reference Hercules Engine Co Inc |
| AB0070864430 | 5/9 Secondary reference Ar Bee Corp |
| 07-864430 | 5/9 Secondary reference Lift Parts Mfg Co Inc Div of Echlin Mfg Co the |
| 864430 | 5/9 Secondary reference Clark Equipment Co |
NSN 5340-00-391-3320 is a Seat,helical Compression Spring, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-00-391-3320 has 2 manufacturer part numbers on file: 220812A (Brinkley Technology Group Llc Dba Hercules Manufacturing), AB0070864430 (Brighton Cromwell Llc).
Key specifications for 220812A: Overall Height: 0.4930 INCHES NOMINAL IN; Countersink Angle in Deg: 45.0; First Step Diameter: 0.8750 INCHES NOMINAL IN; End Diameter: 0.6410 INCHES MINIMUM AND 0.6460 INCHES MAXIMUM IN. 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.