The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-144-1640, 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 16 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-144-1640 |
| Primary Part Number | ST3M747-8-27 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.281 INCHES NOMINAL IN |
| Fastener Length | 2.321 INCHES MINIMUM AND 2.368 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.774 INCHES MINIMUM AND 0.782 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| 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 |
|---|---|
| MB155-8-27 | Hi-Shear Corporation (USA) |
| VCG0002-8-27 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| AIC688-8-27 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M747-8-27 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M747-8-27 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| PBF1266-8-27 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MB155-8-27 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| S397-8-27 | 5/9 Secondary reference U.S. Government activity |
| VS3191-8-27 | 5/2 Secondary reference U.S. Government activity |
| 122896-8-27 | 5/2 Secondary reference U.S. Government activity |
| VS3191-8-27 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| 10115998 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| S397-8-27 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5306-01-144-1640 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-144-1640 has 7 manufacturer part numbers on file: MB155-8-27 (Hi-Shear Corporation), VCG0002-8-27 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), AIC688-8-27 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M747-8-27 (The Boeing Company Div Defense), ST3M747-8-27 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries) and 2 more.
Key specifications for ST3M747-8-27: Head Height: 0.281 INCHES NOMINAL IN; Fastener Length: 2.321 INCHES MINIMUM AND 2.368 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.623 INCHES MINIMUM AND 0.690 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.