The Seat,helical Compression Spring, cataloged under National Stock Number 5340-01-268-2750, is classified within Federal Supply Class 5340 (Hardware, Commercial) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5340-01-268-2750 |
| Item Name | Seat,helical Compression Spring |
| FSC / FSG | 5340 / 53 — Hardware, Commercial |
| Status | ACTIVE |
| First Step Diameter | 4.6250 INCHES NOMINAL IN |
| End Diameter | 3.1800 INCHES NOMINAL IN |
| Distance From End to First Step | 0.4300 INCHES NOMINAL IN |
| Design Type | SOLID |
| Style Designator | SEAT |
| Material Document and Classification | ASTM A582, TYPE 303 ASSN STD SINGLE MATERIAL RESPONSE |
| Spherical Seat Top Radius | 1.5000 INCHES NOMINAL IN |
| Bore Diameter | 0.8120 INCHES NOMINAL IN |
| Material | STEEL COMP 303 |
| 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 |
| Reference | Meaning |
|---|---|
| A49399MEA | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| A49399MEA | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D50557 ITEM 8 | C/1 Advisory reference — outside the item-of-supply concept Hunt Valve Company, Inc. |
| D50557 ITEM 8 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
NSN 5340-01-268-2750 is a Seat,helical Compression Spring, classified under FSC 5340, Hardware, Commercial. Status: active.
Key specifications for 5340-01-268-2750: Overall Height: 1.0000 INCHES NOMINAL IN; First Step Diameter: 4.6250 INCHES NOMINAL IN; End Diameter: 3.1800 INCHES NOMINAL IN; Distance From End to First Step: 0.4300 INCHES NOMINAL IN. 9 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.