the Morse Twist Drill & Machine Tool Co. sez
1/4x20 = 9/32 for body - #7 for 75% thread
1/4x28 = 9/32 body - #3 for 75%
5/16x24 = 11/32 body - .275 for 75%
3/8x24 = 13/32 body - Q [.332] for 75%
1/2x20 = 17/32 body - 29/64 for 75%
#8x32 = #17 body - #30 for 75%
#10x32 = #6 body - #21 for 75%

I say if ya don't have a great bit selection, just come close enuff for the girls ya hang around with grin

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot