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Union Butterfield 1585OV(UNC) High-Speed Steel Spiral Point Tap, Uncoated (Bright) Finish, Round Shank with Square End, Plug Chamfer, 1/4"-20 Thread Size
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About Union Butterfield 1585OV(UNC) High-Speed Steel
The Union Butterfield 1585OV(UNC) uncoated, high-speed steel spiral point tap has a relieved-style design, straight flutes with a plug chamfer, and a round shank with a square end, and is used in a range of materials to create right-hand threads that will be plated or heat-treated after tapping. It is available in ANSI UNC (Unified Coarse) thread standard sizes. The spiral point of this tap (sometimes referred to as a “gun tap”) pushes chips ahead of the tool and the straight flutes reduce clogging. Both characteristics make it suitable for threading through holes (extending through the workpiece). Relieved-style design reduces the friction between tap and workpiece for longer tool life. Oversized taps are used to create threads that are slightly undersized to allow for material added by plating or heat-treating after tapping. Relieved-style design reduces the friction between tap and workpiece for reduced tool wear. A plug chamfer distributes cutting to ease tapping at the beginning of the hole and to maintain correct perpendicular alignment with the workpiece. Right-hand threads are designed to tighten when the 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 provide 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 lathes, or with hand tools such as tap wrenches. In the Union Butterfield 1585OV(UNC) tap series, taps with 1/4” to 5/16” nominal diameters have two flutes, and those with 3/8” to 5/8” nominal diameters have three flutes. In this series all taps have plug chamfers. This tap conforms to ANSI standards and can create threads to a depth 2 times its diameter.
