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Union Butterfield 1785NR High-Speed Steel Spiral Point Tap, Non-Relieved Style, Uncoated (Bright) Finish, Round Shank with Square End

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Product Specifications
Manufacturer Series #
1785NR
Surface Coating
Uncoated (Bright)
Shank Type
Round With Square End
Pitch Diameter Limit
6H
Material Type
High_speed_steel
Thread Type
Metric
Brand Name
Union Butterfield

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Thread Size Chamfer Type Number of Flutes Shank Diameter Length of Threads Overall Length Mfr Part # ASIN

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Currently showing 1-19 of 19
M1.6-0.35 Plug 2 0.141" 0.3125" 1.625" 1012890 B003JY6H2E 1 $20.13 Buy Options
M2-0.4 Taper 2 0.141" 0.4375" 1.75" 1012891 B003JY6H60 1 $19.34 Buy Options
M2.3-0.4 Plug 2 0.141" 0.4375" 1.75" 1012892 B003JY6H6K 1 $15.86 Buy Options
M2.5-0.45 Bottoming 2 0.141" 0.5" 1.8125" 1012893 B003JY6H74 1 $15.86 Buy Options
M2.6-0.45 Plug 2 0.141" 0.5" 1.8125" 1012894 B003JY6H7O 1 $15.86 Buy Options
M3-0.5 Plug 2 0.141" 0.625" 1.9375" 1012896 B003JY6H92 1 $12.55 Buy Options
M3.5-0.6 Plug 2 0.141" 0.6875" 2" 1012897 B003JY6H9M 1 $10.90 Buy Options
M4-0.7 Plug 2 0.138" 0.75" 2.125" 1012898 B003JY6HA6 1 $10.90 Buy Options
M4.5-0.75 Plug 2 0.194" 0.875" 2.375" 1012899 B003JY6HAQ 1 $10.90 Buy Options
M5-0.8 Plug 2 0.194" 0.875" 2.375" 1012900 B003JY6HBA 1 $10.90 Buy Options
M6-1 Taper 2 0.255" 1" 2.5" 1012901 B003JY6HC4 3 $10.90 Buy Options
M7-1 Plug 2 0.318" 1.125" 2.7188" 1012902 B003JY6HCY 1 $12.55 Buy Options
M8-1.25 Bottoming 2 0.318" 1.125" 2.7188" 1012903 B003JY6HDI Temporarily out of stock. Order now and we'll deliver when available. $10.97 Buy Options
M10-1.5 Plug 3 0.381" 1.25" 2.9375" 1012904 B003JY6H2Y 1 $14.19 Buy Options
M12-1.75 Plug 3 0.367" 1.6563" 3.375" 1012905 B003JY6H3I 1 $19.85 Buy Options
M14-2 Plug 3 0.429" 1.6563" 3.5938" 1012906 B003JY6H4C 1 $25.11 Buy Options
M16-2 Plug 3 0.48" 1.8125" 3.8125" 1012907 B003JY6H56 1 $29.64 Buy Options
M18-2.5 Plug 3 0.542" 1.8125" 4.0313" 1012908 B003JY6H5Q 3 $11.88 Buy Options
M20-2.5 Plug 3 0.652" 2" 4.4688" 1012909 B003JY6H8I 1 $46.75 Buy Options

Key Features

  • Spiral point tap pushes chips ahead of tool to reduce clogging
  • Spiral point with straight flutes for cutting threads in through holes
  • Non-relieved design for applications requiring close gauging fits, for manual feed rate applications, or for use on older equipment
  • Produces ANSI standard right-hand threads in metric sizes
  • Plug chamfer for easier starting and correct perpendicular alignment

Product Description

The Union Butterfield 1785NR uncoated, high-speed steel spiral point tap has a non-relieved design, straight flutes with a plug chamfer, and a round shank with a square end, and is used to create right-hand threads in a range of materials. This tool produces ANSI standard threads in metric 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). The non-relieved design of this series has concentric threads without pitch diameter relief. 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 1785NR tap series, taps with nominal diameters of 1.6 mm to 8 mm have two flutes and those with diameters of 10 mm to 20 mm have three flutes. All taps in this 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 6H tolerance class: 6H is used for a normal length of thread engagement and medium tolerance quality.

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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