The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-255-1029, 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 17 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-255-1029 |
| Primary Part Number | ST3M747-4-8 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.164 INCHES MINIMUM IN |
| Fastener Length | 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.471 INCHES MINIMUM AND 0.538 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.390 INCHES MINIMUM AND 0.410 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 |
|---|---|
| ST3M747-4-8 | Heartland Precision Fasteners Inc (USA) |
| MB155-4-8 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| MB155-4-8 | Hi-Shear Corporation (USA) |
| ST3M747-4-8 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| GS1031-4-8 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S397-4-8 | Huck International, Inc (USA) |
| PBF1266-4-8 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11833-4-8 | Reid Products Inc. Dba Reid Products Inc (USA) |
| AIC688-4-8 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0002-4-8 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-4-8 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| VS3191-4-8 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| S397-4-8 | 5/9 Secondary reference U.S. Government activity |
| VS3191-4-8 | 5/2 Secondary reference U.S. Government activity |
| 122896-4-8 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-255-1029 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-255-1029 has 11 manufacturer part numbers on file: ST3M747-4-8 (Heartland Precision Fasteners Inc), MB155-4-8 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), MB155-4-8 (Hi-Shear Corporation), ST3M747-4-8 (Fastener Innovation Technology, Inc. Dba F I T), GS1031-4-8 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 6 more.
Key specifications for ST3M747-4-8: Head Height: 0.164 INCHES MINIMUM IN; Fastener Length: 0.881 INCHES MINIMUM AND 0.928 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.471 INCHES MINIMUM AND 0.538 INCHES MAXIMUM 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.