The Spring,helical,extension, cataloged under National Stock Number 5360-00-320-1252, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Iwc Llc Dba Ideal Windlass Company. 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. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5360-00-320-1252 |
| Primary Part Number | A3427 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Iwc Llc Dba Ideal Windlass Company |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.563 INCHES NOMINAL IN |
| End Style | MACHINE LOOP SECOND END |
| End Style | FULL LOOP FIRST END |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Opening Width | 0.250 INCHES NOMINAL SECOND END IN |
| Spring Free Length | 2.875 INCHES NOMINAL IN |
| Coil to Hook Inside Length | 0.438 INCHES NOMINAL FIRST END IN |
| Coil to Hook Inside Length | 0.794 INCHES NOMINAL SECOND END IN |
| Inside Diameter | 0.401 INCHES NOMINAL IN |
| Coil Quantity | 17 |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Material | STEEL OVERALL |
| Hook Radius | 0.188 INCHES NOMINAL BOTH ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A3427 PRIMARY | Iwc Llc Dba Ideal Windlass Company (USA) |
NSN 5360-00-320-1252 is a Spring,helical,extension, manufactured by Iwc Llc Dba Ideal Windlass Company, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-320-1252 has 1 manufacturer part number on file: A3427 (Iwc Llc Dba Ideal Windlass Company).
2 possible matches (shared part number, not a government interchangeability claim): 2540-00-738-6179, 5840-01-086-9533. Verify interchangeability with system specifications before substitution.
Key specifications for A3427: Spring Free Outside Diameter: 0.563 INCHES NOMINAL IN; End Style: MACHINE LOOP SECOND END; End Style: FULL LOOP FIRST END; Design Type: CLOSED. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.