The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-333-4521, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-333-4521 |
| Primary Part Number | VS2978A05U017 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.187 INCHES NOMINAL IN |
| Fastener Length | 1.413 INCHES NOMINAL IN |
| Thread Length | 0.351 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.062 INCHES NOMINAL IN |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Grip Diameter | 0.3110 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | CHROMATE AND NICKEL AND CADMIUM OVERALL |
| Minimum Tensile Strength | 132000 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| VS2978A05U017 | Howmet Global Fastening Systems Inc (USA) |
| 11797A05U017 | Reid Products Inc. Dba Reid Products Inc (USA) |
| BM3200-5A017 | Huck International, Inc (USA) |
| PBF1041A5U017 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VAL2361105D017 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 68484-5A17 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| AIC2263A05U017 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| STSBG000A05U017 | 3/2 Design control — primary reference U.S. Government activity |
| VS2978A05U017 | 5/9 Secondary reference U.S. Government activity |
| STSBG000A05U017 | 5/2 Secondary reference U.S. Government activity |
| BM3200-5A017 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-333-4521 is a Bolt,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-333-4521 has 7 manufacturer part numbers on file: VS2978A05U017 (Howmet Global Fastening Systems Inc), 11797A05U017 (Reid Products Inc. Dba Reid Products Inc), BM3200-5A017 (Huck International, Inc), PBF1041A5U017 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), VAL2361105D017 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 2 more.
Key specifications for VS2978A05U017: Head Height: 0.187 INCHES NOMINAL IN; Fastener Length: 1.413 INCHES NOMINAL IN; Thread Length: 0.351 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES 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.