With an extra-long shank, these taps have extended reach for tapping deep and hard-to-reach areas in pipe and conduit. They're made of high-speed steel and are for use on most metal and plastic. The square shank is compatible with tap wrenches and tap holders for drill presses and milling machines.
Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.
Bottoming-chamfer taps cut into the workpiece with just 1-2 chamfered threads. This short chamfer lets them thread holes closer to the bottom than other taps, but they require more torque to start threads.
Drill Bit
Plug Chamfer
Bottoming
Chamfer
Pipe
Size Thread
Type Threads
Per Inch Thread
Lg. Overall
Lg. Size Decimal Size
Equivalent No. of
Flutes Each Each
Uncoated High-Speed Steel
1/8 NPT 27 3/4" 6" Q 0.332" 4 2538A31 $54.89 ______ __
1/8 NPTF 27 3/4" 6" Q 0.332" 4 2538A21 54.89 ______ __
1/4 NPT 18 1 1/16" 6" 7/16" 0.4375" 4 2538A32 45.99 ______ __
1/4 NPTF 18 1 1/16" 6" 7/16" 0.4375" 4 2538A22 45.99 ______ __
3/8 NPT 18 1 1/16" 6" 9/16" 0.5625" 4 2538A33 89.56 ______ __
3/8 NPTF 18 1 1/16" 6" 9/16" 0.5625" 4 2538A23 89.56 ______ __
1/2 NPT 14 1 3/8" 6" 45/64" 0.7031" 4 2538A34 86.53 ______ __
1/2 NPTF 14 1 3/8" 6" 45/64" 0.7031" 4 2538A24 86.53 ______ __
3/4 NPT 14 1 3/8" 6" 29/32" 0.9063" 5 2538A35 144.02 ______ __
3/4 NPTF 14 1 3/8" 6" 29/32" 0.9063" 5 2538A25 144.02 ______ __
3 NPT 8 2 5/8" 6" 3 15/64" 3.2344" 7 ______ __ 2525A53 $474.00
3 NPTF 8 2 5/8" 6" 3 15/64" 3.2344" 7 ______ __ 2525A54 536.51
