The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-528-8572, 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 21 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-528-8572 |
| Primary Part Number | MB155-3H2 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.140 INCHES NOMINAL IN |
| Fastener Length | 0.440 INCHES MINIMUM AND 0.487 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.331 INCHES NOMINAL IN |
| Criticality Code Justification | AGAV |
| Hole Configuration Style | SPLINE |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | SPLINE DRIVE SHEAR HEAD |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Head Minor Diameter | 0.386 INCHES NOMINAL IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.041 INCHES MINIMUM AND 0.051 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| MB155-3H2 PRIMARY | Hi-Shear Corporation (USA) |
| GS1031-3H2 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M747-3H2 | Houston Precision Fasteners I Lp (USA) |
| AIC688-3H2 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VCG0002-3H2 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| SLB254-3H2 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 11833-3H2 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M747-3H2 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M747-3H2 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| PBF1266-3H2 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
NSN 5306-01-528-8572 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-528-8572 has 10 manufacturer part numbers on file: MB155-3H2 (Hi-Shear Corporation), GS1031-3H2 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), ST3M747-3H2 (Houston Precision Fasteners I Lp), AIC688-3H2 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), VCG0002-3H2 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 5 more.
Key specifications for MB155-3H2: Head Height: 0.140 INCHES NOMINAL IN; Fastener Length: 0.440 INCHES MINIMUM AND 0.487 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS-QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.331 INCHES NOMINAL IN. 21 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.