The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-381-8166, 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 16 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-381-8166 |
| Primary Part Number | H411-6-18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.210 INCHES NOMINAL IN |
| Fastener Length | 1.564 INCHES MINIMUM AND 1.594 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | NAS NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.454 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.114 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.679 INCHES NOMINAL IN |
| Grip Diameter | 0.3733 INCHES MINIMUM AND 0.3742 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| 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 |
|---|---|
| H411-6-18 PRIMARY | Huck International, Inc (USA) |
| PBF7521-6-18 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC596-6-18 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0030-6-18 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| VS3133-6-18 | 3/2 Design control — primary reference U.S. Government activity |
| 120978-6-18 | 3/2 Design control — primary reference U.S. Government activity |
| 5306-002-6-18 | 5/9 Secondary reference Aidc/aerospace Industrial Development Corp. Dba Aidc |
| H411-6-18 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-381-8166 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-381-8166 has 4 manufacturer part numbers on file: H411-6-18 (Huck International, Inc), PBF7521-6-18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), AIC596-6-18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VCG0030-6-18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems).
Key specifications for H411-6-18: Head Height: 0.210 INCHES NOMINAL IN; Fastener Length: 1.564 INCHES MINIMUM AND 1.594 INCHES MAXIMUM IN; Surface Treatment Document and Classification: NAS NATIONAL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.454 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN. 16 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.