The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-476-1192, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-476-1192 |
| Primary Part Number | ST3M744-4-20 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.556 INCHES MINIMUM AND 1.576 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.316 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 | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Head Minor Diameter | 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 |
| 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 |
|---|---|
| ST3M744-4-20 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| VS3174-4-20 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| VS3174-4-20 PRIMARY | Huck International, Inc (USA) |
| 122895-4-20 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VS3174-4-20 | Howmet Global Fastening Systems Inc (USA) |
| PBF1265-4-20 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M744-4-20 | Houston Precision Fasteners I Lp (USA) |
| WC744-4-20 | West Coast Aerospace, Inc. (USA) |
| GS1015-4-20 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 11823-4-20 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| SLB748-4-20 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| AIC687-4-20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M744-4-20 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VCG0001-4-20 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M744-4-20 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 122895-4-20 | 5/9 Secondary reference Sps Technologies Inc |
| VS3174-4-20 | 3/2 Design control — primary reference U.S. Government activity |
| 122895-4-20 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-476-1192 is a Bolt,close Tolerance, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-476-1192 has 15 manufacturer part numbers on file: ST3M744-4-20 (Heartland Precision Fasteners Inc), VS3174-4-20 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products), VS3174-4-20 (Huck International, Inc), 122895-4-20 (Sps Technologies, Llc Dba PB Fasteners), VS3174-4-20 (Howmet Global Fastening Systems Inc) and 10 more.
Key specifications for ST3M744-4-20: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.556 INCHES MINIMUM AND 1.576 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.316 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.