Select your ACME thread size
Size 'A' - 1/4" Sizes	Size 'D' - 5/8" Sizes
ACME 1/4-20 (1 Start) ACME 1/4-16 (1 Start) ACME 1/4-16 (4 Start)	ACME 5/8-8 (1 Start)
Size 'B' - 3/8" Sizes
ACME 3/8-12 (1 Start) ACME 3/8-10 (1 Start) ACME 3/8-10 (2 Start) ACME 3/8-8 (2 Start) ACME 3/8-8 (4 Start)
Size 'C' - 1/2" Sizes
ACME 1/2-10 (1 Start) ACME 1/2-10 (2 Start) ACME 1/2-10 (5 Start) ACME 1/2-8 (2 Start) ACME 1/2-8 (4 Start) ACME 1/2-8 (8 Start) (currently unavailable) ACME 1/2-6 (1 Start)