The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-332-4561, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 14 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-332-4561 |
| Primary Part Number | ST3M571-12-32 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Head Height | 0.701 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN |
| Fastener Length | 3.037 INCHES MINIMUM AND 3.067 INCHES MAXIMUM IN |
| Extended Washer Diameter | 1.220 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN |
| Thread Length | 1.027 INCHES MINIMUM AND 1.077 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM IN |
| Width Between Flats | 0.803 INCHES MINIMUM AND 0.814 INCHES MAXIMUM IN |
| Grip Diameter | 0.7485 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL CORROSION RESISTING 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 | F |
| Part Number | Manufacturer |
|---|---|
| VS3060-12-32 | Howmet Global Fastening Systems Inc (USA) |
| ST3M571-12-32 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-12-32 | Reid Products Inc. Dba Reid Products Inc (USA) |
| BM3326-12-32 | Huck International, Inc (USA) |
| ST3M571-12-32 | Heartland Precision Fasteners Inc (USA) |
| ST3M571-12-32 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M571-12-32 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-12-32 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M571-12-32 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| ST3M571-12-32 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| 74328-12-32 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| MB84-12-32 | 5/9 Secondary reference Hi-Shear Corporation |
| VS3060-12-32 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-12-32 | 5/9 Secondary reference U.S. Government activity |
| BM3326-12-32 | 5/9 Secondary reference U.S. Government activity |
| VAL23033-12-32 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| S11-1059-12-32 | 5/9 Secondary reference Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| AIC752-12-32 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| S371-12-32 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| ST3M571-12-32 | 5/2 Secondary reference U.S. Government activity |
| 74328-12-32 | 5/9 Secondary reference Sps Technologies Inc |
| S371-12-32 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-332-4561 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-332-4561 has 8 manufacturer part numbers on file: VS3060-12-32 (Howmet Global Fastening Systems Inc), ST3M571-12-32 (Sps Technologies, Llc Dba PB Fasteners), ST3M571-12-32 (Reid Products Inc. Dba Reid Products Inc), BM3326-12-32 (Huck International, Inc), ST3M571-12-32 (Heartland Precision Fasteners Inc) and 3 more.
Key specifications for ST3M571-12-32: Extended Washer Thickness: 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Head Height: 0.701 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN; Fastener Length: 3.037 INCHES MINIMUM AND 3.067 INCHES MAXIMUM IN; Extended Washer Diameter: 1.220 INCHES MINIMUM AND 1.230 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.