The Spring,helical,compression, cataloged under National Stock Number 5360-00-300-7653, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Bae Systems Land & Armaments L.p.. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 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 | 5360-00-300-7653 |
| Primary Part Number | 40521 |
| Item Name | Spring,helical,compression |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Bae Systems Land & Armaments L.p. |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.8075 INCHES NOMINAL IN |
| End Style | SPRING END,SQUARED AND GROUND BOTH ENDS |
| Spring Solid Length | 1.360 INCHES NOMINAL IN |
| Style Designator | CYLINDRICAL |
| Material Document and Classification | JAN-S-1160,GRADE 1,TYPE A-CANCELED MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 3.960 INCHES NOMINAL IN |
| Inside Diameter | 0.6475 INCHES NOMINAL IN |
| Coil Quantity | 17 |
| Surface Treatment | CADMIUM OVERALL |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 4500-20V2029PC34 | Bae Systems Land & Armaments L.p. (USA) |
| 40521F596 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20F595PC37 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20V2029APC34 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20F571PC34 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20V2066PC34 | Bae Systems Land & Armaments L.p. (USA) |
| 40521 PRIMARY | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20F572PC34 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20V2066APC34 | Bae Systems Land & Armaments L.p. (USA) |
| 4500-20F596PC37 | Bae Systems Land & Armaments L.p. (USA) |
NSN 5360-00-300-7653 is a Spring,helical,compression, manufactured by Bae Systems Land & Armaments L.p., classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-300-7653 has 10 manufacturer part numbers on file: 4500-20V2029PC34 (Bae Systems Land & Armaments L.p.), 40521F596 (Bae Systems Land & Armaments L.p.), 4500-20F595PC37 (Bae Systems Land & Armaments L.p.), 4500-20V2029APC34 (Bae Systems Land & Armaments L.p.), 4500-20F571PC34 (Bae Systems Land & Armaments L.p.) and 5 more.
6 possible matches (shared part number, not a government interchangeability claim): 4730-00-771-5314, 5905-01-011-8464, 1680-01-068-1132. Verify interchangeability with system specifications before substitution.
Key specifications for 40521: Spring Free Outside Diameter: 0.8075 INCHES NOMINAL IN; End Style: SPRING END,SQUARED AND GROUND BOTH ENDS; Spring Solid Length: 1.360 INCHES NOMINAL IN; Style Designator: CYLINDRICAL. 11 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.