The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-060-6843, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies Llc Dba PB Fasteners Div PB Fasteners. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-060-6843 |
| Primary Part Number | PBF7521-8DN25 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.281 INCHES NOMINAL IN |
| Fastener Length | 2.080 INCHES MINIMUM AND 2.100 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | NAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE THREADS |
| Surface Treatment Document and Classification | NAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD |
| Thread Length | 0.528 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | AMS6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.552 INCHES MINIMUM AND 1.572 INCHES MAXIMUM IN |
| Width Between Flats | 0.901 INCHES MAXIMUM IN |
| Grip Diameter | 0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM THREADS |
| Surface Treatment | CADMIUM TOP OF HEAD |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.825 INCHES MINIMUM AND 1.845 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| VS3133-8DN25 | Tactair Fluid Controls Inc (USA) |
| H411-8DN25 | Huck International, Inc (USA) |
| SF118-8DN25 | Saturn Fasteners Inc (USA) |
| 120978-8D25N | Sps Technologies, Llc Dba PB Fasteners (USA) |
| AIC596-8DN25 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF7521-8DN25 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VCG0009-8DN25 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| C7521-8DN25 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| H411-8DN25 | 5/9 Secondary reference Panametrics Llc |
| C7521-8DN25 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| 120978-8D25N | 5/2 Secondary reference U.S. Government activity |
| C7521-8DN25 | 5/9 Secondary reference U.S. Government activity |
| VS3133-8DN25 | 5/9 Secondary reference U.S. Government activity |
| VS3133-8DN25 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| C7521-8DN25 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 5306-01-060-6843 is a Bolt,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-060-6843 has 7 manufacturer part numbers on file: VS3133-8DN25 (Tactair Fluid Controls Inc), H411-8DN25 (Huck International, Inc), SF118-8DN25 (Saturn Fasteners Inc), 120978-8D25N (Sps Technologies, Llc Dba PB Fasteners), AIC596-8DN25 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 2 more.
Key specifications for PBF7521-8DN25: Head Height: 0.281 INCHES NOMINAL IN; Fastener Length: 2.080 INCHES MINIMUM AND 2.100 INCHES MAXIMUM IN; Surface Treatment Document and Classification: NAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE THREADS; Surface Treatment Document and Classification: NAS672 NATIONAL SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD. 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.