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 A77599 ACT 1-1/2-11-1/2 1.5000 (1-1/2)" 4-1/4 nan 7 nan HSS NITRIDE & STEAM OXIDE 9 $241.24 -
A77606 ACT 1-11-1/2 1.1250 (1-1/8)" 3-3/4 nan 5 nan HSS TiN 6 $214.48 -
A58399 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPTF Dryseal - Interrupted HSS TIN 5 $290.96 -
A57654 ACT 1-11-1/2 1.125 3-3/4 5 NPT - Interrupted HSS TIN 7 $223.15 -
A55034 ACT 2-11-1/2 1.875 4-1/2 7 NPTF Dryseal HSS Uncoated 23 $245.53 -
A58390 ACT 2-11-1/2 1.875 4-1/2 7 NPTF Dryseal HSS TIN 11 $258.43 -
A55012 ACT 1-1/4-11-1/2 1.3125 4 5 NPT - Interrupted HSS Uncoated 18 $261.20 -
A57655 ACT 1-1/4-11-1/2 1.3125 4 5 NPT - Interrupted HSS STEAM OXIDE 36 $273.86 -
A57656 ACT 1-1/4-11-1/2 1.3125 4 5 NPT - Interrupted HSS TIN 9 $277.24 -
A57658 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT - Interrupted HSS TIN Available to Order* $286.96 -
A54994 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT HSS Uncoated 21 $227.55 -
A57638 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT HSS TIN 14 $257.82 -
A57637 ACT 1-1/2-11-1/2 1.5 4-1/4 7 NPT HSS STEAM OXIDE 100 $243.55 -
A54995 ACT 2-11-1/2 1.875 4-1/2 7 NPT HSS Uncoated 20 $309.60
* Lead times can vary from 1–10 business days. Call (908) 98-ATLAS or email sales@atlascuttingtools.com for details.