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  • Union Butterfield 1534NE(UNC)/1534NE(UNF) High-Speed Steel Spiral Point Tap, Uncoated (Bright) Finish, Round Shank with Square End, Plug Chamfer
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Union Butterfield 1534NE(UNC)/1534NE(UNF) High-Speed Steel Spiral Point Tap, Uncoated (Bright) Finish, Round Shank with Square End, Plug Chamfer

Available in multiple versions


Price: $8.98 - $71.60
Product Specifications
Brand Name Union Butterfield
Material Type High Speed Steel
Finish Types Uncoated (Bright)
Chamfer Type Plug
Shank Type Round With Square End
UNSPSC Code 27112806

The Union Butterfield 1534NE(UNC)/1534NE(UNF) uncoated, high-speed steel spiral point tap has ... Read full product description



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Product Features

  • Spiral point tap pushes chips ahead of tool to reduce clogging
  • Spiral point tap and straight flutes for cutting threads in through holes
  • Extension tap is extra-long for extended reach
  • Non-relieved design for applications requiring close gauging fits, for manual feed rate applications, or for use on older equipment
  • Plug chamfer for easier starting and correct perpendicular alignment

Product Details


Product Description

The Union Butterfield 1534NE(UNC)/1534NE(UNF) uncoated, high-speed steel spiral point tap has a non-relieved design, straight flutes, and an extended 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 “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 has concentric threads without pitch diameter relief. It is recommended for applications requiring close gauging fits and in older equipment or manual feed rate applications where the feed rate control is not sufficient for a relieved-style tap. The extra-long shank of this tool is designed for extended reach. The 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 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 1534NE(UNC) tap series, machine-screw sizes 4 to 10 and nominal diameters 1/4” to 5/16” have two flutes, and 3/8” to 1/2” have three flutes. In the 1534NE(UNF) series, machine-screw size 10 and nominal diameters 1/4” to 5/16” have two flutes, and 3/8” to 1/2” have three flutes. All taps in these series have plug chamfers. This tap conforms to ANSI standards and can create threads to a depth 2 ½ times its diameter. It is suitable for the ANSI 3B tolerance class: 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. 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.


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