The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-107-7239, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 21 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-107-7239 |
| Primary Part Number | ST3M571-5H31 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.072 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN |
| Head Height | 0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN |
| Fastener Length | 2.474 INCHES MINIMUM AND 2.504 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN |
| Thread Length | 0.526 INCHES MINIMUM AND 0.576 INCHES MAXIMUM IN |
| Hole Configuration Style | DOUBLE HEXAGON LONGITUDINAL HOLE |
| Material Document and Classification | 23-112,FSCM 08524,TYPE A MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.928 INCHES MINIMUM AND 1.948 INCHES MAXIMUM IN |
| Width Between Flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Quantity | 4 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM 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 |
|---|---|
| ST3M571-5H31 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M571-5H31 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-5H31 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-5H31 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| GS1030-5H31 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M571-5H31 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-5H31 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-5H31 | J M Precision Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M571-5H31 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-5H31 | 5/2 Secondary reference U.S. Government activity |
| ST3M571-5H31 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| S371-5 | 5/9 Secondary reference U.S. Government activity |
| VAL23033-5 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| VS3060-5 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| ST3M571-5H31 | 5/2 Secondary reference U.S. Government activity |
| 74328-5 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 74328-5 | 5/9 Secondary reference U.S. Government activity |
| BM3326-5H31 | 3/9 Design control — primary reference U.S. Government activity |
| VS3060-5 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-107-7239 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-107-7239 has 8 manufacturer part numbers on file: ST3M571-5H31 (Hi-Shear Corporation), ST3M571-5H31 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M571-5H31 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M571-5H31 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), GS1030-5H31 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 3 more.
Key specifications for ST3M571-5H31: Extended Washer Thickness: 0.072 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN; Head Height: 0.338 INCHES MINIMUM AND 0.358 INCHES MAXIMUM IN; Fastener Length: 2.474 INCHES MINIMUM AND 2.504 INCHES MAXIMUM IN; Extended Washer Diameter: 0.521 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN. 21 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.