Content:
1/4 unc has 20 threads per inch.
5/16 unc has 18 threads per inch.
1/4 x 1/2 10x 5/16 x 1/2 6x
1/4 x 5/8 10x 5/16 x 5/8 8x
1/4 x 3/4 10x 5/16 x 3/4 8x
1/4 x 1 10x 5/16 x 1 6x
1/4 x 1.1/4 8x 5/16 x 1.1/4 5x
1/4 x 1.1/2 6x 5/16 x 1.1/2 5x