The 5/8-18 drill size applied in hole wizard is incorrect The hole wizard uses 0.578 inches and it should be 0.562 (this error is significant if someone is concerned about thread shear strength)
Kman
2004/SP1 Tapped Holes
Nov 28, 2003
2 Replies
My Machinery's Handbook lists .5781" tap drill size for a 75% thread. If you drilled a .562" hole, you would have more thread engagement.
WT
3B range (1.5D to 3D) may vary from .571 to .575.
David Janes
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