Spindle thread
The spindle threads of drills are governed by a global standard. As a rule, American fine threads (UNF) are used. The most common thread sizes are: 1/2"-20 UNF, 3/8"-24 UNF, 5/8"-16 UNF. (See also Drills)
The spindle threads of drills are governed by a global standard. As a rule, American fine threads (UNF) are used. The most common thread sizes are: 1/2"-20 UNF, 3/8"-24 UNF, 5/8"-16 UNF. (See also Drills)