Pipe Pulley Thread Forming
A collection of specialized HSS tap styles for pipe threading, pulley set-screw applications, and chipless thread forming. Available in NPT, NPTF Dryseal, NPS, NC, and NF thread standards.
Thread Forming: Rather than cutting material away, thread forming taps displace it, cold-forming the thread into the hole wall. This produces a stronger thread with no chips to evacuate — ideal for ductile materials and ensures no chip-related jams in blind holes.
Pipe Taps (NPT/NPTF/NPS): Tapered pipe taps cut threads that seal on the taper itself, standard for plumbing and fluid-fitting connections. NPTF Dryseal variants seal without additional sealant; interrupted-thread versions reduce torque and improve chip control in deeper holes.
Pulley Taps: Designed specifically for the shallow, often through-drilled holes used in set-screw applications on pulleys and hubs.
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Compare SKU Vendor Size Shank Diameter Overall Length H Limit D Limit NC / NF Square Size Square Length Thread Length Number of Lube Grooves Number of Flutes Style Material Coating In Stock Price Quantity A77600 ACT 2-11-1/2 1.8750 (1-7/8)" 4-1/2 nan 7 nan HSS NITRIDE & STEAM OXIDE 13 $357.42 -
A55044 ACT 2-11-1/2 1.875 4-1/2 7 NPTF Dryseal - Interrupted HSS Uncoated 5 $375.57 -
A55013 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT - Interrupted HSS Uncoated 17 $348.73 -
A57657 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT - Interrupted HSS STEAM OXIDE 55 $374.91 -
A55014 ACT 2-11-1/2 1.875 4-1/2 7 NPT - Interrupted HSS Uncoated 4 $341.48 -
A57640 ACT 2-11-1/2 1.875 4-1/2 7 NPT HSS TIN 9 $374.37 -
A57639 ACT 2-11-1/2 1.875 4-1/2 7 NPT HSS STEAM OXIDE 9 $323.50