The Bolt,square Neck, cataloged under National Stock Number 5306-00-576-6906, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Department of the Air Force. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-576-6906 |
| Primary Part Number | 70-8-90 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — No Item Name Available |
| Manufacturer | Department of the Air Force |
| Status | ACTIVE |
| Features Provided | SQUARE NUT |
| Thread Direction | RIGHT-HAND |
| Neck Length | 0.344 INCHES NOMINAL IN |
| Thread Length | 1.375 INCHES MINIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Minimum Tensile Strength | 48000 POUNDS PER SQUARE INCH LBS |
| Head Diameter | 1.063 INCHES NOMINAL IN |
| Fastener Length | 9.000 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Head Style | BUTTON |
| Nondefinitive Spec/std Data | C2 TYPE |
| Thread Quantity Per Inch | 13 |
| Material Document and Classification | FF-B-571 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Class | 2A A |
| Neck Width | 0.500 INCHES NOMINAL IN |
| Head Height | 0.250 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 70-8-90 | Department of the Air Force (USA) |
| FFB571ATYPEC2 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| 70-8-90 | Air Force Standard |
NSN 5306-00-576-6906 is a Bolt,square Neck, manufactured by Department of the Air Force, classified under FSC 5306 (No Item Name Available). Status: active.
NSN 5306-00-576-6906 has 3 cross-referenced part numbers: 70-8-90 (Department of the Air Force), FFB571ATYPEC2 (Federal Specifications Promulgated by General Services Administration Washington DC), 70-8-90 (Air Force Standard).
There are 3 known substitutes for 5306-00-576-6906: 5945-00-418-2927, 5306-00-514-8308, 5895-01-678-4063. Verify interchangeability with system specifications before substitution.
Key specifications for 70-8-90: Features Provided: SQUARE NUT; Thread Direction: RIGHT-HAND; Neck Length: 0.344 INCHES NOMINAL IN; Thread Length: 1.375 INCHES MINIMUM IN. 17 total characteristics are documented in the Federal Logistics Information System.