The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-607-1146, 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 17 specifications, cited from the U.S. Government catalog. The record lists 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-607-1146 |
| Primary Part Number | VS3060-6-21 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN |
| Head Height | 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN |
| Fastener Length | 1.911 INCHES MINIMUM AND 1.941 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN |
| Thread Length | 0.589 INCHES MINIMUM AND 0.639 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| VS3060-6-21 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| VS3060-6-21 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| ST3M571-6-21 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M571-6-21 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| MB84-6-21 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-6-21 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB84-6-21 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| VAL23033-6-21 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-6-21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| S11-1059-6-21 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| AIC752-6-21 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| S371-6-21 PRIMARY | Huck International, Inc (USA) |
| MB84-6-21 PRIMARY | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 74328-6-21 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M571-6-21 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 74328-6-21 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| VS3060-6-21 | 5/9 Secondary reference U.S. Government activity |
| S371-6-21 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-6-21 | 5/9 Secondary reference Pruitt Energy Sources Inc |
| BM3326-6-21 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-607-1146 is a Bolt,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-607-1146 has 13 manufacturer part numbers on file: VS3060-6-21 (Howmet Global Fastening Systems Inc), VS3060-6-21 (Fairchild Fasteners Europe - Vsd Gmbh), ST3M571-6-21 (Heartland Precision Fasteners Inc), ST3M571-6-21 (Fastener Innovation Technology, Inc. Dba F I T), MB84-6-21 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 8 more.
Key specifications for VS3060-6-21: Extended Washer Thickness: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Head Height: 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN; Fastener Length: 1.911 INCHES MINIMUM AND 1.941 INCHES MAXIMUM IN; Extended Washer Diameter: 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN. 17 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.