The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-526-3915, 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 18 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-526-3915 |
| Primary Part Number | MB156L5-24 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.045 INCHES NOMINAL IN |
| Head Height | 0.312 INCHES NOMINAL IN |
| Fastener Length | 2.051 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | 18021 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.575 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN |
| Thread Length | 0.551 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.313 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.500 INCHES NOMINAL IN |
| Head Minor Diameter | 0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Grip Diameter | 0.311 INCHES NOMINAL IN |
| Surface Treatment | LUBRICANT OVERALL |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.853 INCHES NOMINAL 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 |
|---|---|
| MB156L5-24 PRIMARY | Hi-Shear Corporation (USA) |
| PBF1267L5-20 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| S343L5-24 PRIMARY | Huck International, Inc (USA) |
| ST3M753L5-24 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VFK600L5-24 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| AIC763L5-24 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VS3190L5-24 | Howmet Global Fastening Systems Inc (USA) |
| SLB255-L5-24 PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M753L5-24 | Houston Precision Fasteners I Lp (USA) |
| ST3M753L5-24 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| GS1032-L5-24 PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| HP7753L5-24 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M753L5-24 PRIMARY | The Boeing Company Div Defense (USA) |
| 11829L5-24 | Reid Products Inc. Dba Reid Products Inc (USA) |
| 122897L5-24 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 122897L5-24 | 5/9 Secondary reference Sps Technologies Inc |
| 122897L5-24 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-526-3915 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-526-3915 has 15 manufacturer part numbers on file: MB156L5-24 (Hi-Shear Corporation), PBF1267L5-20 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), S343L5-24 (Huck International, Inc), ST3M753L5-24 (Fastener Innovation Technology, Inc. Dba F I T), VFK600L5-24 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 10 more.
Key specifications for MB156L5-24: Extended Washer Thickness: 0.045 INCHES NOMINAL IN; Head Height: 0.312 INCHES NOMINAL IN; Fastener Length: 2.051 INCHES NOMINAL IN; Surface Treatment Document and Classification: 18021 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 18 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.