The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-135-4145, 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 16 specifications, cited from the U.S. Government catalog. The record lists 11 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-135-4145 |
| Primary Part Number | ST3M744-4-8 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 0.806 INCHES MINIMUM AND 0.826 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 |
| 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 | 0.490 INCHES MINIMUM AND 0.510 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 |
| 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 |
|---|---|
| ST3M744-4-8 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| GS1015-4-8 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VCG0001-4-8 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VS3174-4-8 | Howmet Global Fastening Systems Inc (USA) |
| ST3M744-4-8 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M744-4-8 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| PBF1265-4-8 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB154-4-8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S406-4-8 | Huck International, Inc (USA) |
| MB154-4-8 | Hi-Shear Corporation (USA) |
| AIC687-4-8 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| Reference | Meaning |
|---|---|
| S406-4-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-4-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M744-4-8 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| VS3174-4-8 | 5/9 Secondary reference U.S. Government activity |
| 122895-4-8 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-135-4145 is a Bolt,close Tolerance, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-135-4145 has 11 manufacturer part numbers on file: ST3M744-4-8 (Heartland Precision Fasteners Inc), GS1015-4-8 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), VCG0001-4-8 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), VS3174-4-8 (Howmet Global Fastening Systems Inc), ST3M744-4-8 (Howmet Global Fastening Systems Inc) and 6 more.
Key specifications for ST3M744-4-8: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 0.806 INCHES MINIMUM AND 0.826 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. 16 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.