The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-272-8324, 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 19 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-272-8324 |
| Primary Part Number | ST3M747-4D18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.506 INCHES MINIMUM AND 1.553 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.300 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE 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 | 1.115 INCHES MINIMUM AND 1.135 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) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.385 INCHES MINIMUM AND 1.442 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 |
|---|---|
| PBF 1266-4D18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M747-4D18 PRIMARY | The Boeing Company Div Defense (USA) |
| AIC688-4D18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB155-4D18 | Hi-Shear Corporation (USA) |
| MB155-4D18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| VCG0002-4D18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M747-4D18 | 5/2 Secondary reference U.S. Government activity |
| 122896-4D18 | 5/2 Secondary reference U.S. Government activity |
| VS3191-4D18 | 5/9 Secondary reference U.S. Government activity |
| S397-4D18 | 5/9 Secondary reference U.S. Government activity |
| S397-4D18 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VS3191-4D18 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
NSN 5306-01-272-8324 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-272-8324 has 6 manufacturer part numbers on file: PBF 1266-4D18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M747-4D18 (The Boeing Company Div Defense), AIC688-4D18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB155-4D18 (Hi-Shear Corporation), MB155-4D18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 1 more.
Key specifications for ST3M747-4D18: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.506 INCHES MINIMUM AND 1.553 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.300 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN. 19 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.