| VALLEY-TODECO, INC. | 6710 |
| HUCK INTERNATIONAL, INC. | 17446 |
| SPS TECHNOLOGIES, LLC | 27624 |
| MERCURY AEROSPACE FASTENERS INC | 50945 |
| CHANDLER CRAFTSMAN CONTROLS | 52628 |
| SPS TECHNOLOGIES, LLC | 56878 |
| ALL MANUFACTURERS, INC. | 57472 |
| ALLEN MFG CO SUB OF CHICAGO PNEUMATIC TOOL CO | 70276 |
| ALCOA GLOBAL FASTENERS, INC. | 92215 |
| TEXTRON FASTENING SYSTEMS DBA DECORAH OPERATIONS TFS | 93907 |
| MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | 96906 |
| HUCK INTL INC | 97928 |
| ALCOA FASTENING SYSTEMS FAIRCHILDFASTENERS EUROPE - VSD GMBH | C4293 |
| VALLEY-TODECO, INC. | 6710 |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.492 INCHES MINIMUM |
| FASTENER LENGTH | 1.512 INCHES NOMINAL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.300 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.069 INCHES NOMINAL |
| GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| GRIP LENGTH | 1.000 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM OVERALL AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| MATERIAL | STEEL COMP E4340 OVERALL OR STEEL COMP 8740 OVERALL OR STEEL COMP 6150 OVERALL OR STEEL COMP 4140 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OVERALL OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OVERALL OR MIL-S-5626 MIL SPEC 4TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.492 INCHES MINIMUM |
| FASTENER LENGTH | 1.512 INCHES NOMINAL |
| HEAD STYLE | DOUBLE HEXAGON W/HOLE |
| HEAD HEIGHT | 0.300 INCHES NOMINAL |
| WIDTH BETWEEN FLATS | 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM |
| EXTENDED WASHER DIAMETER | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM |
| EXTENDED WASHER THICKNESS | 0.069 INCHES NOMINAL |
| GRIP DIAMETER | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| GRIP LENGTH | 1.000 INCHES NOMINAL |
| THREAD QUANTITY PER INCH | 28 |
| MINIMUM TENSILE STRENGTH | 180000 POUNDS PER SQUARE INCH |
| HARDNESS RATING | 39.0 ROCKWELL C MINIMUM OVERALL AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| MATERIAL | STEEL COMP E4340 OVERALL OR STEEL COMP 8740 OVERALL OR STEEL COMP 6150 OVERALL OR STEEL COMP 4140 OVERALL |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OVERALL OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL OR MIL-S-8503 MIL SPEC 3RD MATERIAL RESPONSE OVERALL OR MIL-S-5626 MIL SPEC 4TH MATERIAL RESPONSE OVERALL |
| SURFACE TREATMENT | CADMIUM OVERALL AND CHROMATE OVERALL |
| SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL |
| THREAD SERIES DESIGNATOR | UNF |
MS21250-05
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