The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-139-9946, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Fastener Innovation Technology, Inc. Dba F I T. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-139-9946 |
| Primary Part Number | ST3M744-4D33 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Fastener Innovation Technology, Inc. Dba F I T |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 2.368 INCHES MINIMUM AND 2.388 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.296 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 5629 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 | 2.052 INCHES MINIMUM AND 2.072 INCHES MAXIMUM IN |
| Width Between Flats | 0.448 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.250 INCHES MINIMUM AND 2.280 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 | X |
| Part Number | Manufacturer |
|---|---|
| ST3M744-4D33 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VCG0001-4D33 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GS1015-4D33 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M744-4D33 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| VS3174-4D33 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| PBF1265-4D33 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC687-4D33 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| 10115980 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| VS3174-4D33 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-4D33 | 5/9 Secondary reference U.S. Government activity |
| MB154-4D33 | 5/9 Secondary reference Hi-Shear Corporation |
| 122895-4D33 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M744-4D33 | 5/9 Secondary reference Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| S406-4D33 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-4D33 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-139-9946 is a Bolt,close Tolerance, manufactured by Fastener Innovation Technology, Inc. Dba F I T, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-139-9946 has 7 manufacturer part numbers on file: ST3M744-4D33 (Fastener Innovation Technology, Inc. Dba F I T), VCG0001-4D33 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), GS1015-4D33 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), ST3M744-4D33 (Heartland Precision Fasteners Inc), VS3174-4D33 (Howmet Global Fastening Systems Inc) and 2 more.
Key specifications for ST3M744-4D33: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 2.368 INCHES MINIMUM AND 2.388 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.296 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN. 18 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.