The Bolt,shear, cataloged under National Stock Number 5306-00-900-2522, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-900-2522 |
| Primary Part Number | MS21250-06066 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Extended Washer Thickness | 0.091 INCHES NOMINAL IN |
| Head Height | 0.388 INCHES NOMINAL IN |
| Fastener Length | 4.770 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| Extended Washer Diameter | 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN |
| Thread Length | 0.625 INCHES MINIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 4.125 INCHES NOMINAL IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.3735 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 8740 OR STEEL COMP 4340 OR STEEL COMP 6150 OR STEEL COMP 4140 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 |
|---|---|
| MS21250-06066 | Howmet Global Fastening Systems Inc (USA) |
| MS21250-06066 | All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners (USA) |
| MS21250-06066 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MS21250-06066 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MS21250-06066 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VFK100G-06066 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MS21250-06066 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| MS21250-06066 | 5/9 Secondary reference Mercury Aerospace Fasteners Inc |
| MS21250-06066 | 5/2 Secondary reference U.S. Government activity |
| MS21250-06066 | 5/9 Secondary reference U.S. Government activity |
| MS21250-06066 | 5/9 Secondary reference U.S. Government activity |
| MS21250-06066 | 5/2 Secondary reference U.S. Government activity |
| MS21250-06066 | 5/9 Secondary reference Air World Mfg |
| MS21250-06066 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-900-2522 is a Bolt,shear, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-900-2522 has 7 manufacturer part numbers on file: MS21250-06066 (Howmet Global Fastening Systems Inc), MS21250-06066 (All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners), MS21250-06066 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MS21250-06066 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), MS21250-06066 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 2 more.
Key specifications for MS21250-06066: Extended Washer Thickness: 0.091 INCHES NOMINAL IN; Head Height: 0.388 INCHES NOMINAL IN; Fastener Length: 4.770 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL. 19 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.