UNC
INTERNAL
UNF
INTERNAL
METRIC INTERNAL/
METRIC EXTERNAL
METRIC INTERNAL/
UNC EXTERNAL

UNF INTERNAL THREADS
E-Z LOK
Part No.		 Internal
Thread 		External
Thread 		Length
in. 		Tap Drill
Size		 Tap
Size 		Minimum Full
Thread Depth		 Drive Tool
Catalog No.
303-332 10-32 3/8-16 .406 5/16 3/8-16 15/32 500-2
303-428 1/4-28 7/16-14 .437 23/64 7/16-14 1/2 500-3
303-524 5/16-24 1/2-13 .484 27/64 1/2-13 9/16 500-4
303-624 3/8-24 9/16-12 .515 31/64 9/16-12 19/32 500-5
303-720 7/16-20 5/8-11 .656 17/32 5/8-11 23/32 500-6
303-820 1/2-20 3/4-10 .656 21/32 3/4-10 3/4 500-7

Dimensional Drawing

Mechanical Properties
See installation Video
800.234.5613
240 E. Rosecrans Ave, Gardena, CA 90248
v–310.323.5613 f–310.353.4444