The Spring,helical,extension, cataloged under National Stock Number 5360-00-896-6581, is classified within Federal Supply Class 5360 (Coil, Flat, Leaf, and Wire Springs) of the Hardware and Abrasives group. The manufacturer of record is L3 Technologies, Inc. Div L3 Keo. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 5360-00-896-6581 |
| Primary Part Number | B566-251 |
| Item Name | Spring,helical,extension |
| FSC / FSG | 5360 / 53 — Coil, Flat, Leaf, and Wire Springs |
| Manufacturer | L3 Technologies, Inc. Div L3 Keo |
| Status | ACTIVE |
| Spring Free Outside Diameter | 0.355 INCHES NOMINAL IN |
| End Style | SHORT TWISTED HOOK SECOND END |
| End Style | DOUBLE TWIST LOOP FIRST END |
| Design Type | CLOSED |
| Style Designator | CYLINDRICAL |
| Material Document and Classification | QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spring Free Length | 1.422 INCHES NOMINAL IN |
| Spring Deflection Rate | 35.200 POUNDS PER INCH NOMINAL LBS |
| Coil to Hook Inside Length | 0.187 INCHES NOMINAL SECOND END IN |
| Coil to Hook Inside Length | 0.305 INCHES NOMINAL FIRST END IN |
| Inside Diameter | 0.245 INCHES NOMINAL IN |
| Coil Quantity | 15 |
| Coil Helix Direction | RIGHT-HAND OR LEFT-HAND |
| Hook Radius | 0.125 INCHES NOMINAL FIRST END IN |
| Hook Radius | 0.094 INCHES NOMINAL SECOND END 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 |
|---|---|
| B566-251 PRIMARY | L3 Technologies, Inc. Div L3 Keo (USA) |
| Reference | Meaning |
|---|---|
| 566B004887 | C/1 Advisory reference — outside the item-of-supply concept L3 Technologies, Inc. Div L3 Keo |
NSN 5360-00-896-6581 is a Spring,helical,extension, manufactured by L3 Technologies, Inc. Div L3 Keo, classified under FSC 5360, Coil, Flat, Leaf, and Wire Springs. Status: active.
NSN 5360-00-896-6581 has 1 manufacturer part number on file: B566-251 (L3 Technologies, Inc. Div L3 Keo).
Key specifications for B566-251: Spring Free Outside Diameter: 0.355 INCHES NOMINAL IN; End Style: SHORT TWISTED HOOK SECOND END; End Style: DOUBLE TWIST LOOP FIRST END; Design Type: CLOSED. 15 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.