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 A57659 ACT 2-11-1/2 1.875 4-1/2 7 NPT - Interrupted HSS STEAM OXIDE 10 $506.68