The Bolt,shear, cataloged under National Stock Number 5306-01-309-3742, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-309-3742 |
| Primary Part Number | C7521-4-11 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems 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 | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.043 INCHES MINIMUM AND 1.073 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.345 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.448 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN |
| Grip Diameter | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| C7521-4-11 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| PBF7521-4-11 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC596-4-11 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C7521-4-11 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0009-4-11 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| C7521-4-11 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| C7521-4-11 PRIMARY | Huck International, Inc (USA) |
| C7521-4-11 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 5306PL1499118 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| VS3133-4-11 | 5/9 Secondary reference U.S. Government activity |
| H411-4-11 | 5/9 Secondary reference Huck International, Inc |
| C7521-4-11 | 7/2 Vendor item drawing reference U.S. Government activity |
| C7521-4-11 | 3/2 Design control — primary reference U.S. Government activity |
| 120978-4-11 | 5/2 Secondary reference U.S. Government activity |
| 9120978-4-11 | 5/9 Secondary reference U.S. Government activity |
| 5306PL1802939 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| H411-4-11 | 5/9 Secondary reference U.S. Government activity |
| C7521-4-11 | 5/9 Secondary reference U.S. Government activity |
| VS3133-4-11 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
NSN 5306-01-309-3742 is a Bolt,shear, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-309-3742 has 8 manufacturer part numbers on file: C7521-4-11 (Howmet Global Fastening Systems Inc), PBF7521-4-11 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), AIC596-4-11 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C7521-4-11 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VCG0009-4-11 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 3 more.
Key specifications for C7521-4-11: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.164 INCHES NOMINAL IN. 21 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.