Machine Screw Sizes gauge sizes range from #000 to #14.
Starting at #0 size which is .060 inch at the thread's major diameter, all sizes above this (1-14) are larger by increments of .013 inch.
"four forty" screw is a #4 screw with 40 threads per inch.
"six thirty-two is a #6 screw with 32 threads per inch.
"eight thirty-two" is a #8 screw with 32 threads per inch.
"ten thirty-two" screw is a #10 screw with 32 threads per inch.
