Dormer E653 High-Speed Steel Combination Drill and Pipe Tap, NPT, Uncoated (Bright) Finish, Round Shank with Square End, 1/4"-18 Thread Size

Key features

• Combination drill and tap creates holes and cuts threads in one operation for efficient tooling
• Spiral flutes pull chips back from the tip of the tool and out of the hole to prevent clogging
• For creating and threading through holes
• NPT (National Pipe Taper) for compatibility with a range of threads
• Modified bottoming chamfer has additional length to reduce chip load, add tool life, and permit higher tapping speeds

The Dormer E653 uncoated, high-speed steel spiral flute tap and drill combination has a round shank with a square end and a modified bottoming chamfer, and is used to drill holes and create NPT (National Pipe Taper) right-hand threads in a range of materials. The tool drills and threads holes in one operation. Its 27-degree spiral flutes pull chips back from the tip of the tool, up and out of the hole to prevent clogging, making it suitable for use in through holes (extending through the workpiece). The modified bottoming chamfer has additional length to reduce chip load, add tool life in difficult to machine materials, and permit higher tapping speeds. Right-hand threads are designed to tighten when a head or nut is rotated clockwise (the most common threading direction). High-speed steel (HSS) is a common general-purpose steel for cutting tools and is compatible with a variety of materials. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials and provides an economical alternative to coated tools. The round shank with square end helps to minimize rotation in the tool holder. This tool can be used in machines, such as drill presses or

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