| FASTENER LENGTH | 0.750 INCHES NOMINAL |
| HARDNESS RATING | 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD DIAMETER | 0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| HEAD HEIGHT | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM |
| HEAD STYLE | FLAT CHAMFER |
| INTERNAL DRIVE STYLE | HEXAGON |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-624 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-624 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-624 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-624 FED SPEC 5TH MATERIAL RESPONSE OR QQ-S-624 FED SPEC 6TH MATERIAL RESPONSE OR QQ-S-624 FED SPEC 7TH MATERIAL RESPONSE OR QQ-S-624 FED SPEC 8TH MATERIAL RESPONSE OR QQ-S-624,FS9440 FED SPEC 9TH MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL COMP 2340 OR STEEL COMP 3135 OR STEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8630 OR STEEL COMP 8740 OR STEEL OVERALL |
| MINIMUM YIELD STRENGTH | 140000 POUNDS PER SQUARE INCH |
| NOMINAL THREAD DIAMETER | 0.250 INCHES |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND 11 STYLE |
| WIDTH ACROSS FLATS | 0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM |
| SURFACE TREATMENT | CADMIUM OR ZINC OVERALL |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 0.750 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 28 |