The Bolt,shear, cataloged under National Stock Number 5306-00-177-5506, 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 20 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-177-5506 |
| Primary Part Number | MS21250-06048 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Surface Finish | 32.0 MICROINCHES PRIMARY WASHER |
| Extended Washer Thickness | 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN |
| Head Height | 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN |
| Fastener Length | 3.635 INCHES MINIMUM AND 3.655 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN |
| Thread Length | 0.625 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM 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 |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL 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 |
|---|---|
| MS21250-06048 | Howmet Global Fastening Systems Inc (USA) |
| MS21250-06048 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| MS21250-06048 | All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners (USA) |
| VFK100G-06048 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 932.35.60.124 | Pilatus Aircraft Ltd (CHE) |
| MS21250-0648 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MS21250-06048 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| MS21250-06048 | 5/2 Secondary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference Allen Mfg Co Sub of Chicago Pneumatic Tool Co |
| NASM21250 | 5/9 Secondary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference Mercury Aerospace Fasteners Inc |
| MS21250-06048 | 5/9 Secondary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference Chandler Craftsman Controls |
| MS21250-06048 | 3/2 Design control — primary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference Air World Mfg |
| MS21250-06048 | 5/2 Secondary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference U.S. Government activity |
| MS21250-06048 | 5/9 Secondary reference Huck International, Inc |
NSN 5306-00-177-5506 is a Bolt,shear, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-177-5506 has 7 manufacturer part numbers on file: MS21250-06048 (Howmet Global Fastening Systems Inc), MS21250-06048 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), MS21250-06048 (All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners), VFK100G-06048 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), 932.35.60.124 (Pilatus Aircraft Ltd) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 5306-01-698-6209. Verify interchangeability with system specifications before substitution.
Key specifications for MS21250-06048: Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES PRIMARY WASHER; Extended Washer Thickness: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Head Height: 0.378 INCHES MINIMUM AND 0.398 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.