The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-332-4479, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 11 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-332-4479 |
| Primary Part Number | MB84-4-26 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 2.078 INCHES MINIMUM AND 2.108 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN |
| Width Between Flats | 0.304 INCHES MINIMUM AND 0.313 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 CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| MB84-4-26 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-4-26 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB84-4-26 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M571-4-26 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-4-26 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M571-4-26 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-4-26 | Hi-Shear Corporation (USA) |
| ST3M571-4-26 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-4-26 | J M Precision Inc (USA) |
| ST3M571-4-26 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M571-4-26 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| BM3326-4-26 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| S371-4-26 | 5/9 Secondary reference U.S. Government activity |
| VS3060-4-26 | 5/9 Secondary reference U.S. Government activity |
| AIC752-4-26 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| VAL23033-4-26 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| ST3M571-4-26 | 5/2 Secondary reference U.S. Government activity |
| 74328-4-26 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| S11-1059-4-26 | 5/9 Secondary reference Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries |
| S371-4-26 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VS3060-4-26 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| 74328-4-26 | 5/9 Secondary reference Sps Technologies Inc |
| BM3326-4-26 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-4-26 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-332-4479 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-332-4479 has 11 manufacturer part numbers on file: MB84-4-26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M571-4-26 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), MB84-4-26 (Hi-Shear Corporation), ST3M571-4-26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M571-4-26 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 6 more.
Key specifications for MB84-4-26: Extended Washer Thickness: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 2.078 INCHES MINIMUM AND 2.108 INCHES MAXIMUM IN; Extended Washer Diameter: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM 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.