| FASTENER LENGTH | 1.359 INCHES MINIMUM AND 1.391 INCHES MAXIMUM |
| HARDNESS RATING | 27.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| HEAD HEIGHT | 0.270 INCHES MINIMUM AND 0.293 INCHES MAXIMUM |
| HEAD STYLE | SQUARE |
| HOLE QUANTITY | 1 |
| HOLE TYPE | DRILLED |
| INTERNAL DRIVE STYLE | W/O INTERNAL DRIVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | QQ-S-624,COMP 8640 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-624,COMP 8740 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-624,FS 8635 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-624,FS 8735 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-624,FS 4135 FED SPEC 5TH MATERIAL RESPONSE OR QQ-S-624,FS 4140 FED SPEC 6TH MATERIAL RESPONSE OVERALL |
| MATERIAL | STEEL OVERALL |
| NOMINAL THREAD DIAMETER | 0.375 INCHES |
| POINT CHAMFER ANGLE | 4.0 DEGREES NOMINAL |
| POINT LENGTH | 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM |
| POINT STYLE | FLAT |
| THREAD CLASS | 3A |
| THREAD DIRECTION | RIGHT-HAND |
| THREAD LENGTH | 1.218 INCHES MINIMUM AND 1.282 INCHES MAXIMUM |
| THREAD SERIES DESIGNATOR | UNF |
| THREAD QUANTITY PER INCH | 16 |
| WIDTH BETWEEN FLATS | 0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |