The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-337-3261, 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 14 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-337-3261 |
| Primary Part Number | PBF7521-6-16 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| Status | ACTIVE |
| Head Height | 0.194 INCHES NOMINAL IN |
| Fastener Length | 1.439 INCHES MINIMUM AND 1.469 INCHES MAXIMUM IN |
| Thread Length | 0.454 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN |
| Material Document and Classification | AMS-6487 (H11) ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.3750 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.679 INCHES NOMINAL IN |
| Grip Diameter | 0.373 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN |
| 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 |
|---|---|
| PBF7521-6-16 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| H411-6-16 PRIMARY | Huck International, Inc (USA) |
| AIC596-6-16 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0030-6-16 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 5306-002-6-16 | 5/9 Secondary reference Aidc/aerospace Industrial Development Corp. Dba Aidc |
| VS3133-6-16 | 3/2 Design control — primary reference U.S. Government activity |
| 120978-6-16 | 3/2 Design control — primary reference U.S. Government activity |
| H411-6-16 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-337-3261 is a Bolt,close Tolerance, manufactured by Sps Technologies Llc Dba PB Fasteners Div PB Fasteners, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-337-3261 has 4 manufacturer part numbers on file: PBF7521-6-16 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), H411-6-16 (Huck International, Inc), AIC596-6-16 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VCG0030-6-16 (Valley-Todeco, Inc. Dba Arconic Fastening Systems).
Key specifications for PBF7521-6-16: Head Height: 0.194 INCHES NOMINAL IN; Fastener Length: 1.439 INCHES MINIMUM AND 1.469 INCHES MAXIMUM IN; Thread Length: 0.454 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN; Material Document and Classification: AMS-6487 (H11) ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 14 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.