The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-173-0334, 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 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 15 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-173-0334 |
| Primary Part Number | ST3M744-6D15 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.210 INCHES NOMINAL IN |
| Fastener Length | 1.319 INCHES MINIMUM AND 1.339 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.371 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 1.201 INCHES MINIMUM AND 1.231 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.578 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN |
| Grip Diameter | 0.5460 INCHES MINIMUM AND 0.5740 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| 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 |
|---|---|
| ST3M744-6D15 | Heartland Precision Fasteners Inc (USA) |
| ST3M744-6D15 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M744-6D15 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M744-6D15 PRIMARY | The Boeing Company Div Services (USA) |
| Reference | Meaning |
|---|---|
| 10116090 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M744-6D15 | 5/9 Secondary reference Huck International, Inc |
| ST3M744-6D15 | 5/9 Secondary reference B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace |
| ST3M744-6D15 | 5/9 Secondary reference West Coast Aerospace, Inc. |
| VCG0001-6D15 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| 122895-6D15 | 5/9 Secondary reference U.S. Government activity |
| VS3174-6D15 | 5/9 Secondary reference U.S. Government activity |
| AIC687-6D15 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| PBF1265-6D15 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| ST3M744-6D15 | 5/9 Secondary reference Houston Precision Fasteners I Lp |
| ST3M744-6D15 | 5/9 Secondary reference Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok |
| ST3M744-6D15 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
| S406-6D15 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-6D15 | 5/9 Secondary reference U.S. Government activity |
| MB154-6D15 | 5/9 Secondary reference Hi-Shear Corporation |
NSN 5306-01-173-0334 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-173-0334 has 4 manufacturer part numbers on file: ST3M744-6D15 (Heartland Precision Fasteners Inc), ST3M744-6D15 (The Boeing Company Div Defense), ST3M744-6D15 (Fastener Innovation Technology, Inc. Dba F I T), ST3M744-6D15 (The Boeing Company Div Services).
Key specifications for ST3M744-6D15: Head Height: 0.210 INCHES NOMINAL IN; Fastener Length: 1.319 INCHES MINIMUM AND 1.339 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.371 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN. 19 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.