The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-254-8286, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-254-8286 |
| Primary Part Number | ST3M747-4-9 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace |
| Status | ACTIVE |
| Head Height | 0.164 INCHES MINIMUM IN |
| Fastener Length | 0.943 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 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 | 0.552 INCHES MINIMUM AND 0.572 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 |
|---|---|
| MB155-4-9 | Hi-Shear Corporation (USA) |
| AIC688-4-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB155-4-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M747-4-9 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VS3191-4-9 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M747-4-9 | Houston Precision Fasteners I Lp (USA) |
| SLB254-4-9 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| GS1031-4-9 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S397-4-9 | Huck International, Inc (USA) |
| HP7747-4-9 | Heartland Precision Fasteners Inc (USA) |
| ST3M747-4-9 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M747-4-9 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| VCG0002-4-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-4-9 | The Boeing Company Div Defense (USA) |
| PBF1266-4-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| S397-4-9 | 5/9 Secondary reference U.S. Government activity |
| VS3191-4-9 | 5/9 Secondary reference U.S. Government activity |
| 122896-4-9 | 5/2 Secondary reference U.S. Government activity |
| ST3M747-4-9 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-254-8286 is a Bolt,close Tolerance, manufactured by B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-254-8286 has 15 manufacturer part numbers on file: MB155-4-9 (Hi-Shear Corporation), AIC688-4-9 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB155-4-9 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M747-4-9 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), VS3191-4-9 (Howmet Global Fastening Systems Inc) and 10 more.
Key specifications for ST3M747-4-9: Head Height: 0.164 INCHES MINIMUM IN; Fastener Length: 0.943 INCHES MINIMUM AND 0.990 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.371 INCHES MINIMUM AND 0.438 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.