The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-188-6841, 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 9 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-188-6841 |
| Primary Part Number | S406-4D12 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 1.056 INCHES MINIMUM AND 1.076 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.296 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5629 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 | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.448 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.938 INCHES MINIMUM AND 0.968 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 |
|---|---|
| VCG0001-4D12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GS1015-4D12 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| MB154-4D12 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M744-4D12 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| PBF1265-4D12 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC687-4D12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| S406-4D12 PRIMARY | Huck International, Inc (USA) |
| MB154-4D12 | Hi-Shear Corporation (USA) |
| VS3174-4D12 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 122895-4D12 | 5/2 Secondary reference U.S. Government activity |
| VS3174-4D12 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-4D12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M744-4D12 | 5/2 Secondary reference U.S. Government activity |
| S406-4D12 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-188-6841 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-188-6841 has 9 manufacturer part numbers on file: VCG0001-4D12 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), GS1015-4D12 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), MB154-4D12 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M744-4D12 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), PBF1265-4D12 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 4 more.
Key specifications for S406-4D12: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 1.056 INCHES MINIMUM AND 1.076 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.296 INCHES MINIMUM AND 0.336 INCHES MAXIMUM 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.