Spiral point tap pushes chips ahead of tool to reduce clogging
Spiral point and straight flutes for cutting threads in through holes
Relieved-style design with eccentric, full-pitch diameter thread relief for free cutting and
Round shank with square end helps to minimize rotation in the tool holder
Available in UNC (Unified Coarse) and UNF (Unified Fine) right-hand thread options for different
The Union Butterfield 1534(UNC)/1534(UNF) uncoated, high-speed steel spiral point tap has a relieved-style design, straight flutes, and a round shank with a square end, and is used to create right-hand threads in a range of materials. It is available in two different ANSI thread specification standards: UNC (Unified Coarse) and UNF (Unified Fine). The spiral point of this tap (sometimes referred to as a â€œgun tapâ€) 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 reduced tool wear. This tap features eccentric, full pitch diameter thread relief for free cutting and increased tool life.
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 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 1534(UNC) and 1534(UNF) tap series, all tap sizes have two flutes. They are available with a variety of chamfers. This tap conforms to ANSI standards and can create threads to a depth 2 Â½ times its diameter. It is suitable for ANSI 2B and 3B tolerance classes: 2B is an average quality fit for commercial and industrial fasteners; 3B produces close-tolerance fasteners used for greater resistance to stripping, as in aerospace applications.
Taps produce internal threads in previously formed holes and can be used in machines (such as drill presses) or with hand tools.
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