This is a demo store. No orders will be fulfilled.

Industrial Hardware and Specialties is classified as an ESSENTIAL business and is fully operational.

Please read our COVID-19 Message To Our Customers.

PIPE TAP DRILL SIZES
TAP SIZE NPT TAP DRILL NPS TAP DRILL
TPI = THREADS PER INCH INCH M/M INCH M/M
1/16 - 27 TPI D 6.25 1/4 6.35
1/8 - 27 TPI Q 8.45 11/32 8.75
1/4 - 18 TPI 7/16 11.00 7/16 11.50
3/8 - 18 TPI 9/16 14.50 37/64 15.00
1/2 - 14 TPI 45/64 18.00 23/32 18.50
3/4 - 14 TPI 29/32 23.00 59/64 23.50
1 - 11-1/2 TPI 1-9/64 29.00 1-5/32 29.50
1-1/4 - 11-1/2 TPI 1-31/64 38.00 1-1/2 38.85
1-1/2 - 11-1/2 TPI 1-47/64 44.00 1/3/4 44.50
2 - 11-1/2 TPI 2-13/64 56.00 2-7/32 57.00
2-1/2 - 8 TPI 2-5/8 66.68 2-21/32 67.47