The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-439-3827, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 12 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-439-3827 |
| Primary Part Number | MB155-8-26 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.281 INCHES NOMINAL IN |
| Fastener Length | 2.258 INCHES MINIMUM AND 2.305 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.649 INCHES NOMINAL IN |
| Material Document and Classification | AMS5627 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 | 1.625 INCHES NOMINAL IN |
| Head Minor Diameter | 0.778 INCHES NOMINAL 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 |
|---|---|
| MB155-8-26 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M747-8-26 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| MB155-8-26 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M747-8-26 | Heartland Precision Fasteners Inc (USA) |
| ST3M747-8-26 | Huck International, Inc (USA) |
| ST3M747-8-26 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M747-8-26 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M747-8-26 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M747-8-26 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1031-8-26 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VCG0002-8-26 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-8-26 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| PBF 1266-8-26 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
| VS3191-8-26 | 5/9 Secondary reference U.S. Government activity |
| 122896-8-26 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| ST3M747-8-26 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| AIC688-8-26 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
NSN 5306-01-439-3827 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-439-3827 has 12 manufacturer part numbers on file: MB155-8-26 (Hi-Shear Corporation), ST3M747-8-26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), MB155-8-26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M747-8-26 (Heartland Precision Fasteners Inc), ST3M747-8-26 (Huck International, Inc) and 7 more.
Key specifications for MB155-8-26: Head Height: 0.281 INCHES NOMINAL IN; Fastener Length: 2.258 INCHES MINIMUM AND 2.305 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.649 INCHES NOMINAL 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.