Union Butterfield 1534NR(UNF) High-Speed Steel Spiral Point Tap, Uncoated (Bright) Finish, Round Shank With Square End, Plug Chamfer, H1 Tolerance, #0-80 Thread Size
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The Union Butterfield 1534NR(UNC)/1534(UNF)/1534(UNS) uncoated, high-speed steel spiral point tap has a non-relieved 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 three different ANSI thread specification standards: UNC (Unified Coarse), UNF (Unified Fine), or UNS (Unified Special). 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). The non-relieved design of this series has concentric threads without pitch diameter relief. It is recommended for applications requiring close gauging fits and in older equipment that is not sufficiently rigid to accomodate the relieved-style series of spiral pointed taps.
Taps produce internal threads in previously formed holes and can be used in machines (such as drill presses) or with hand tools. Common types of taps include hand taps, spiral point taps, spiral flute taps, thread forming taps, and pipe taps. Hand taps (straight-flute taps) collect chips in the straight flutes of the tool; spiral point taps push chips through holes ahead of the tool; and spiral flute taps pull chips back from the tip of the tool, up and out the hole. Thread forming taps, also known as cold forming taps, press rather than cut to create threads in a drilled hole, and no chips are created. Pipe taps create threads in pipes and pipe fittings. Each thread type designates a thread profile and each type is identified with an abbreviation. In the U.S. and Canada, the Unified Thread Standard is the dominant thread type, including UNC (Unified Coarse), UNF (Unified Fine), and NPT (National Pipe Taper) threads, among others.
Precision Dormer manufactures cutting tools under the following brands: Precision Twist, Dormer, and Union Butterfield. The company has locations around the world, and provides tools adhering to ANSI, NAS, and DIN standards.
- Union Butterfield
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