The Spring,helical,extension, cataloged under National Stock Number 5360-00-321-6470, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is Mack Trucks Inc Parts Opn. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 5360-00-321-6470 |
| Primary Part Number | 368SJ18 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | Mack Trucks Inc Parts Opn |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.630 INCHES MINIMUM AND 0.650 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | TT-E-489 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Load Rating | 40.00 POUNDS NOMINAL LBS |
| End Style | MACHINE LOOP BOTH ENDS |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Opening Width | 0.590 INCHES NOMINAL BOTH ENDS IN |
| Material Document and Classification | QQ-W-428,TYPE 1 OR 2 /D/ FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 3.832 INCHES NOMINAL IN |
| Spring Deflection Rate | 66.400 POUNDS PER INCH NOMINAL LBS |
| Coil to Hook Inside Length | 0.810 INCHES NOMINAL BOTH ENDS IN |
| Inside Diameter | 0.415 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Spring Length Under Load | 3.947 INCHES NOMINAL IN |
| Coil Quantity | 17-1/2 |
| Surface Treatment | ENAMEL OVERALL |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Material | STEEL OVERALL |
| Hook Radius | 0.190 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 |
|---|---|
| 368SJ18 PRIMARY | Mack Trucks Inc Parts Opn (USA) |
| 7F9578 | Caterpillar Inc Div Caterpillar Defense (USA) |
| 7F-9578 | Finning (uk) Ltd (GBR) |
| 8333077 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 47757 | 5/9 Secondary reference Bendix Corp the Brake and Steering Div |
NSN 5360-00-321-6470 is a Spring,helical,extension, manufactured by Mack Trucks Inc Parts Opn, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-321-6470 has 4 manufacturer part numbers on file: 368SJ18 (Mack Trucks Inc Parts Opn), 7F9578 (Caterpillar Inc Div Caterpillar Defense), 7F-9578 (Finning (uk) Ltd), 8333077 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 368SJ18: Spring Free Outside Diameter: 0.630 INCHES MINIMUM AND 0.650 INCHES MAXIMUM IN; Surface Treatment Document and Classification: TT-E-489 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Load Rating: 40.00 POUNDS NOMINAL LBS; End Style: MACHINE LOOP BOTH ENDS. 18 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.