The Bolt,shear, cataloged under National Stock Number 5306-01-280-5729, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Valley-Todeco, Inc. Dba Arconic Fastening Systems. Government technical data includes 21 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-280-5729 |
| Primary Part Number | C7521-4-18 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| 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 | 1.470 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.335 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.522 INCHES MINIMUM AND 0.531 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) |
| Head Diameter | 0.531 INCHES MAXIMUM IN |
| 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 |
|---|---|
| C7521-4-18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| AIC596-4-18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C7521-4-18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| PBF7521-4-18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| C7521-4-18 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| C7521-4-18 | 5/2 Secondary reference U.S. Government activity |
| C7521-4-18 | 5/2 Secondary reference U.S. Government activity |
| C7521-4-18 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-280-5729 is a Bolt,shear, manufactured by Valley-Todeco, Inc. Dba Arconic Fastening Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-280-5729 has 5 manufacturer part numbers on file: C7521-4-18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), AIC596-4-18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C7521-4-18 (Sps Technologies, Llc Dba PB Fasteners), PBF7521-4-18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), C7521-4-18 (Huck International, Inc).
Key specifications for C7521-4-18: 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.