The Bolt,shear, cataloged under National Stock Number 5306-01-018-5588, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Acufast Aircraft Products. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 15 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-018-5588 |
| Primary Part Number | MS21250-08076 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Acufast Aircraft Products |
| Status | ACTIVE |
| Extended Washer Thickness | 0.123 INCHES NOMINAL IN |
| Head Height | 0.504 INCHES NOMINAL IN |
| Fastener Length | 5.538 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN |
| Thread Length | 0.778 INCHES MINIMUM AND 0.798 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 4.740 INCHES MINIMUM AND 4.760 INCHES MAXIMUM IN |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Grip Diameter | 0.4985 INCHES MINIMUM AND 0.4995 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 | 20 |
| Material | STEEL COMP E4340 OR STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 6150 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 | F |
| Part Number | Manufacturer |
|---|---|
| MS21250-08076 | Acufast Aircraft Products (USA) |
| MS21250-08076 | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| MS21250-08076 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MS21250-08076 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| MS21250-08076 | 5/9 Secondary reference U.S. Government activity |
| MS21250-08076 | 5/9 Secondary reference Air World Mfg |
| CIPRD-MS21250-08076 | 3/9 Design control — primary reference Defense Logistics Agency Dba Defense Supply Center Philadelphia |
| MS21250-08076 | 5/9 Secondary reference Hi-Shear Corporation |
| MS21250-08076 | 5/9 Secondary reference Mercury Aerospace Fasteners Inc |
| MS21250-08076 | 5/9 Secondary reference U.S. Government activity |
| MS21250-08076 | 5/9 Secondary reference U.S. Government activity |
| VFK100G-08076 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| MS21250-08076 | 5/9 Secondary reference Allen Mfg Co Sub of Chicago Pneumatic Tool Co |
| MS21250-08076 | 5/9 Secondary reference All Manufacturers, Inc. Dba Allied Harbor Aerospace Fasteners |
| MS21250-08076 | 5/9 Secondary reference Huck International, Inc |
| MS21250-08076 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| MS21250-08076 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| MS21250-08076 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| MS21250-08076 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-018-5588 is a Bolt,shear, manufactured by Acufast Aircraft Products, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-018-5588 has 4 manufacturer part numbers on file: MS21250-08076 (Acufast Aircraft Products), MS21250-08076 (M.s. Aerospace Inc. Dba Ms Aerospace Inc), MS21250-08076 (Sps Technologies, Llc Dba PB Fasteners), MS21250-08076 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for MS21250-08076: Extended Washer Thickness: 0.123 INCHES NOMINAL IN; Head Height: 0.504 INCHES NOMINAL IN; Fastener Length: 5.538 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE 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.