The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-493-5544, 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 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-493-5544 |
| Primary Part Number | MB156L4-10F |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.036 INCHES NOMINAL IN |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 1.093 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.470 INCHES NOMINAL IN |
| Thread Length | 0.468 INCHES NOMINAL IN |
| Supplementary Features | IVD COATING; DRY FILM LUBRICATION |
| Nominal Thread Diameter | 0.062 INCHES IN |
| Head Style | SPLINE EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.625 INCHES NOMINAL IN |
| Head Minor Diameter | 0.312 INCHES NOMINAL IN |
| Grip Diameter | 0.248 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| MB156L4-10F PRIMARY | Hi-Shear Corporation (USA) |
| MB156L4-10F PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11829L4-10F | Reid Products Inc. Dba Reid Products Inc (USA) |
| 122897L4-10F PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1032-L4-10F PRIMARY | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S343L4-10F PRIMARY | Huck International, Inc (USA) |
| HP7753L4-10F PRIMARY | Heartland Precision Fasteners Inc (USA) |
| SLB255-L4-10F PRIMARY | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| VFK600L4-10F PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M753L4-10F PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M753L4-10F | Houston Precision Fasteners I Lp (USA) |
| PBF1267L4-10F PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M753L4-10F PRIMARY | The Boeing Company Div Defense (USA) |
| AIC763L4-10F PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| VS3190L4-10F PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 122897L4-10F | 5/9 Secondary reference Sps Technologies Inc |
| 122897L4-10F | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-493-5544 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-493-5544 has 15 manufacturer part numbers on file: MB156L4-10F (Hi-Shear Corporation), MB156L4-10F (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 11829L4-10F (Reid Products Inc. Dba Reid Products Inc), 122897L4-10F (Sps Technologies, Llc Dba PB Fasteners), GS1032-L4-10F (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 10 more.
Key specifications for MB156L4-10F: Extended Washer Thickness: 0.036 INCHES NOMINAL IN; Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 1.093 INCHES NOMINAL IN; Extended Washer Diameter: 0.470 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.