The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-174-0529, 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 18 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-174-0529 |
| Primary Part Number | ST3M744-5D24 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Head Height | 0.187 INCHES NOMINAL IN |
| Fastener Length | 1.865 INCHES MINIMUM AND 1.885 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.355 INCHES MINIMUM AND 0.395 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 | 0.312 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN |
| Width Between Flats | 0.514 INCHES MINIMUM AND 0.521 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 COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.747 INCHES MINIMUM AND 1.777 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 |
|---|---|
| ST3M744-5D24 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M744-5D24 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M744-5D24 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| AIC687-5D24 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1265-5D24 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VCG0001-5D24 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GS1015-5D24 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 11823-5D24 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| MB154-5D24 | 5/9 Secondary reference Hi-Shear Corporation |
| VS3174-5D24 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M744-5D24 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-5D24 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 122895-5D24 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M744-5D24 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| S406-5D24 | 5/9 Secondary reference U.S. Government activity |
| VS3174-5D24 | 5/9 Secondary reference U.S. Government activity |
| ST3M744 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 5306-01-174-0529 is a Bolt,close Tolerance, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-174-0529 has 8 manufacturer part numbers on file: ST3M744-5D24 (Heartland Precision Fasteners Inc), ST3M744-5D24 (Fastener Innovation Technology, Inc. Dba F I T), ST3M744-5D24 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), AIC687-5D24 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), PBF1265-5D24 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 3 more.
1 possible match (shared part number, not a government interchangeability claim): 5306-01-710-6089. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M744-5D24: Head Height: 0.187 INCHES NOMINAL IN; Fastener Length: 1.865 INCHES MINIMUM AND 1.885 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.355 INCHES MINIMUM AND 0.395 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.