| THREAD SERIES DESIGNATOR |
UNC |
| NOMINAL THREAD DIAMETER |
0.250 INCHES |
| THREAD QUANTITY PER INCH |
20 |
| THREAD CLASS |
2A |
| THREAD DIRECTION |
RIGHT-HAND |
| THREAD LENGTH |
0.275 INCHES MINIMUM AND 0.375 INCHES MAXIMUM |
| FASTENER LENGTH |
0.375 INCHES NOMINAL |
| SCREW MATERIAL |
STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013 |
| SCREW MATERIAL DOCUMENT AND CLASSIFICATION |
66 FED STD ALL MATERIAL RESPONSES |
| SCREW SURFACE TREATMENT |
CADMIUM AND CHROMATE |
| SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION |
QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE |
| MINIMUM TENSILE STRENGTH |
55000 POUNDS PER SQUARE INCH |
| HEAD STYLE |
A23 PAN |
| HEAD DIAMETER |
0.473 INCHES MINIMUM AND 0.492 INCHES MAXIMUM |
| HEAD HEIGHT |
0.162 INCHES MINIMUM AND 0.175 INCHES MAXIMUM |
| INTERNAL DRIVE STYLE |
B1 CROSS RECESS TYPE 1 |