The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-463-1581, 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 20 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-463-1581 |
| Primary Part Number | MB155-4H14 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 1.256 INCHES MINIMUM AND 1.303 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 |
| Hole Configuration Style | SPLINE |
| Material Document and Classification | AMS 5629 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 | 0.865 INCHES MINIMUM AND 0.885 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 |
| 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 | X |
| Part Number | Manufacturer |
|---|---|
| MB155-4H14 PRIMARY | Hi-Shear Corporation (USA) |
| AIC688-4H14 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB155-4H14 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| GS1031-4H14 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VCG0002-4H14 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M747-4H14 | Heartland Precision Fasteners Inc (USA) |
| ST3M747-4H14 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| PBF1266-4H14 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| VS3191-4H14 | 5/9 Secondary reference U.S. Government activity |
| S397-4H14 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VS3191-4H14 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| ST3M747-4H14 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| S397-4H14 | 5/9 Secondary reference U.S. Government activity |
| 122896-4H14 | 3/2 Design control — primary reference U.S. Government activity |
| 122896-4H14 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies Inc |
NSN 5306-01-463-1581 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-463-1581 has 8 manufacturer part numbers on file: MB155-4H14 (Hi-Shear Corporation), AIC688-4H14 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB155-4H14 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), GS1031-4H14 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), VCG0002-4H14 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 3 more.
Key specifications for MB155-4H14: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 1.256 INCHES MINIMUM AND 1.303 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. 20 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.