The Bolt,square Neck, cataloged under National Stock Number 5306-00-208-2091, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, 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 | 5306-00-208-2091 |
| Primary Part Number | FFB571TYPEC2CLASSC |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — No Item Name Available |
| Manufacturer | Federal Specifications Promulgated by General Services Administration Washington DC |
| Status | ACTIVE |
| Thread Class | 2A A |
| Thread Length | 0.750 INCHES MINIMUM IN |
| Thread Quantity Per Inch | 20 |
| Neck Length | 0.219 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Nondefinitive Spec/std Data | C2 TYPE |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Material Document and Classification | FF-B-571 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Style | BUTTON |
| Thread Direction | RIGHT-HAND |
| Features Provided | SQUARE NUT |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Fastener Length | 3.500 INCHES NOMINAL IN |
| Head Diameter | 0.563 INCHES NOMINAL IN |
| Head Height | 0.125 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Neck Width | 0.250 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| FFB571TYPEC2CLASSC | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| FFB571 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
NSN 5306-00-208-2091 is a Bolt,square Neck, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 5306 (No Item Name Available). Status: active.
NSN 5306-00-208-2091 has 2 cross-referenced part numbers: FFB571TYPEC2CLASSC (Federal Specifications Promulgated by General Services Administration Washington DC), FFB571 (Federal Specifications Promulgated by General Services Administration Washington DC).
There are 3 known substitutes for 5306-00-208-2091: 5306-00-582-5952, 5306-00-639-3314, 5306-00-993-6257. Verify interchangeability with system specifications before substitution.
Key specifications for FFB571TYPEC2CLASSC: Thread Class: 2A A; Thread Length: 0.750 INCHES MINIMUM IN; Thread Quantity Per Inch: 20; Neck Length: 0.219 INCHES NOMINAL IN. 18 total characteristics are documented in the Federal Logistics Information System.