The Bolt,square Neck, cataloged under National Stock Number 5306-00-514-7529, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-514-7529 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Neck Length | 0.219 INCHES NOMINAL IN |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 2.250 INCHES NOMINAL IN |
| Thread Length | 0.750 INCHES MINIMUM IN |
| Material Document and Classification | FF-B-571 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | SQUARE NUT |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Nondefinitive Spec/std Data | C2 TYPE AND C CLASS |
| Neck Width | 0.250 INCHES NOMINAL IN |
| Minimum Tensile Strength | 48000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.563 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| FFB571 | 4/1 Identification reference U.S. Government activity |
| 70-4-22 | 5/9 Secondary reference U.S. Government activity |
| 70-4-22 | 2/2 Government specification standardization U.S. Government activity |
NSN 5306-00-514-7529 is a Bolt,square Neck, classified under FSC 5306, Bolts. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4730-00-821-9812, 5330-01-322-2437. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-514-7529: Neck Length: 0.219 INCHES NOMINAL IN; Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 2.250 INCHES NOMINAL IN; Thread Length: 0.750 INCHES MINIMUM IN. 17 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.