The Bolt,shear, cataloged under National Stock Number 5306-01-166-1466, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-166-1466 |
| Primary Part Number | C7521-6-6 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.210 INCHES NOMINAL IN |
| Fastener Length | 0.814 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN |
| Thread Length | 0.429 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Width Between Flats | 0.679 INCHES MAXIMUM IN |
| Grip Diameter | 0.3733 INCHES MINIMUM AND 0.3742 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| C7521-6-6 | Huck International, Inc (USA) |
| C7521-6-6 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C7521-6-6 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| C7521-6-6 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| C7521-6-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| C7521-6-6 | 5/9 Secondary reference U.S. Government activity |
| C7521-6-6 | 3/2 Design control — primary reference U.S. Government activity |
| PBF7521-6-6 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| C7521-6-6 | 5/2 Secondary reference U.S. Government activity |
| C7521-6-6 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-166-1466 is a Bolt,shear, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-166-1466 has 5 manufacturer part numbers on file: C7521-6-6 (Huck International, Inc), C7521-6-6 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C7521-6-6 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), C7521-6-6 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), C7521-6-6 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for C7521-6-6: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.210 INCHES NOMINAL IN. 19 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.