The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-121-8181, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. The manufacturer of record is Tactair Fluid Controls Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5340-01-121-8181 |
| Primary Part Number | HP1322107-1 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| Countersink Angle in Deg | 30.0 |
| First Step Diameter | 0.4300 INCHES NOMINAL IN |
| End Diameter | 0.2500 INCHES NOMINAL IN |
| Countersink Diameter | 0.3000 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-A-8625, TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE |
| Distance From End to First Step | 0.0620 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024 FED SPEC SINGLE MATERIAL RESPONSE |
| Counterbore Length | 0.0500 INCHES NOMINAL IN |
| Counterbore Diameter | 0.2600 INCHES NOMINAL IN |
| Surface Treatment | ANODIZE |
| Bore Diameter | 0.1200 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY 2024 |
| 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 |
|---|---|
| HP1322107-1 PRIMARY | Tactair Fluid Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| HP1322107-1 | 5/9 Secondary reference U.S. Government activity |
NSN 5340-01-121-8181 is a Seat,helical Compression Spring, manufactured by Tactair Fluid Controls Inc, classified under FSC 5340, Hardware, Commercial. Status: active.
NSN 5340-01-121-8181 has 1 manufacturer part number on file: HP1322107-1 (Tactair Fluid Controls Inc).
Key specifications for HP1322107-1: Overall Height: 0.1900 INCHES NOMINAL IN; Countersink Angle in Deg: 30.0; First Step Diameter: 0.4300 INCHES NOMINAL IN; End Diameter: 0.2500 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.