The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-384-3432, 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 17 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-384-3432 |
| Primary Part Number | S397-4-12 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.153 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.422 INCHES MINIMUM AND 0.446 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| ST3M747-4-12 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| S397-4-12 PRIMARY | Huck International, Inc (USA) |
| ST3M747-4-12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-4-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HP7747-4-12 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M747-4-12 PRIMARY | Huck International, Inc (USA) |
| ST3M747-4-12 | Heartland Precision Fasteners Inc (USA) |
| MB155-4-12 PRIMARY | Hi-Shear Corporation (USA) |
| VCG0002-4-12 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-4-12 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M747-4-12 | Hi-Shear Corporation (USA) |
| PBF1266-4-12 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GS1031-4-12 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 122896-4-12 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VS3191-4-12 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M747-4-12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 122896-4-12 | 5/9 Secondary reference U.S. Government activity |
| AIC688-4-12 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| ST3M747-4-12 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M747-4-12 | 5/9 Secondary reference U.S. Government activity |
| MB155-4-12 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| VS3191-4-12 | 5/9 Secondary reference U.S. Government activity |
| ST3M747-4-12 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| ST3M747-4-12 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
NSN 5306-01-384-3432 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-384-3432 has 15 manufacturer part numbers on file: ST3M747-4-12 (Fastener Innovation Technology, Inc. Dba F I T), S397-4-12 (Huck International, Inc), ST3M747-4-12 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M747-4-12 (Sps Technologies, Llc Dba PB Fasteners), HP7747-4-12 (Heartland Precision Fasteners Inc) and 10 more.
Key specifications for S397-4-12: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.153 INCHES MINIMUM AND 1.188 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.397 INCHES NOMINAL 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.