The Bolt,square Neck, cataloged under National Stock Number 5306-01-646-5549, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Fastenal Company. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-646-5549 |
| Primary Part Number | 21353 |
| Item Name | Bolt,square Neck |
| FSC / FSG | 5306 / 53 — No Item Name Available |
| Manufacturer | Fastenal Company |
| Status | ACTIVE |
| Head Height | 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN |
| Fastener Length | 0.720 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN |
| Head Diameter | 0.782 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN |
| Head Style | ROUND |
| Thread Length | 0.532 INCHES MINIMUM AND 0.551 INCHES MAXIMUM IN |
| Neck Width | 0.368 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Neck Length | 0.188 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Surface Treatment | ZINC OVERALL |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 21353 PRIMARY | Fastenal Company (USA) |
NSN 5306-01-646-5549 is a Bolt,square Neck, manufactured by Fastenal Company, classified under FSC 5306 (No Item Name Available). Status: active.
NSN 5306-01-646-5549 has 1 cross-referenced part number: 21353 (Fastenal Company).
There are 8 known substitutes for 5306-01-646-5549: 3020-00-761-8778, 5340-01-151-7062, 4320-01-252-4785 and 5 more. Verify interchangeability with system specifications before substitution.
Key specifications for 21353: Head Height: 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN; Fastener Length: 0.720 INCHES MINIMUM AND 0.770 INCHES MAXIMUM IN; Head Diameter: 0.782 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN; Part Name Assigned by Controlling Agency: ROUND HEAD, CARRIAGE BOLT. 16 total characteristics are documented in the Federal Logistics Information System.