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Union Butterfield 1587(UNC)/1587(UNF)/1588(UNF)1588(UNF) High-Speed Steel Spiral Flute Tap, High-Helix, Uncoated (Bright) Finish, Round Shank with Square End

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Product Specifications
Surface Coating
Uncoated (Bright)
Shank Type
Round With Square End
Material Type
High Speed Steel
UNSPSC Code
27112806
Brand Name
Union Butterfield

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Currently showing 1-20 of 36 Next 16 »
Thread Size Thread Type Manufacturer Series # Chamfer Type Number of Flutes Shank Diameter Length of Threads Overall Length Pitch Diameter Limit Mfr Part # ASIN

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Currently showing 1-20 of 36 Next 16 »
#3-48 UNC 1587(UNC) Plug 2 0.141" 0.5" 1.8125" H2 1010885 B003JY6BAW yes $28.60 Buy Options
#3-48 UNC 1587(UNC) Bottoming 2 0.141" 0.5" 1.8125" H2 1010886 B003JY6BBG yes $28.60 Buy Options
#4-40 UNC 1587(UNC) Bottoming 2 0.141" 0.5625" 1.875" H2 1010888 B003JY6BD4 yes $23.95 Buy Options
#4-40 UNC 1587(UNC) Plug 2 0.141" 0.5625" 1.875" H2 1010887 B003JY6BCA yes $23.95 Buy Options
#5-40 UNC 1587(UNC) Plug 2 0.141" 0.625" 1.9375" H2 1010889 B003JY6BE8 yes $5.77 Buy Options
#5-40 UNC 1587(UNC) Bottoming 2 0.141" 0.625" 1.9375" H2 1010890 B003JY6BES yes $17.26 Buy Options
#6-32 UNC 1587(UNC) Plug 2 0.141" 0.6875" 2" H3 1010891 B003JY6BFM yes $15.96 Buy Options
#6-32 UNC 1587(UNC) Bottoming 2 0.141" 0.6875" 2" H3 1010892 B003JY6BG6 yes $18.95 Buy Options
#8-32 UNC 1587(UNC) Plug 3 0.168" 0.75" 2.125" H3 1010895 B003JY6BGQ yes $18.95 Buy Options
#8-32 UNC 1587(UNC) Bottoming 3 0.168" 0.75" 2.125" H3 1010896 B003JY6BHK yes $15.65 Buy Options
#10-24 UNC 1587(UNC) Plug 3 0.194" 0.875" 2.375" H3 1010897 B003JY6B7K yes $18.95 Buy Options
#10-24 UNC 1587(UNC) Bottoming 3 0.194" 0.875" 2.375" H3 1010898 B003JY6B8Y yes $18.95 Buy Options
#10-32 UNF 1587(UNF) Plug 3 0.194" 0.875" 2.375" H3 1010899 B003JY6BIE yes $20.45 Buy Options
#10-32 UNF 1587(UNF) Bottoming 3 0.194" 0.875" 2.375" H3 1010900 B003JY6BJ8 yes $15.72 Buy Options
#12-24 UNC 1587(UNC) Plug 3 0.22" 0.9375" 2.375" H3 1010901 B003JY6B9I yes $15.02 Buy Options
#12-24 UNC 1587(UNC) Bottoming 3 0.22" 0.9375" 2.375" H3 1010902 B003JY6BA2 yes $18.65 Buy Options
1/4"-20 UNC 1588(UNC) Plug 3 0.255" 1" 2.5" H3 1010398 B003JY6BL6 yes $20.45 Buy Options
1/4"-20 UNC 1588(UNC) Bottoming 3 0.255" 1" 2.5" H3 1010399 B003JY6BLQ yes $20.45 Buy Options
1/4"-28 UNF 1588(UNF) Plug 3 0.255" 1" 2.5" H3 1010400 B003JY6BS4 yes $20.45 Buy Options
1/4"-28 UNF 1588(UNF) Bottoming 3 0.255" 1" 2.5" H3 1010401 B003JY6BSY yes $15.76 Buy Options

Key Features

  • Spiral flute tap design pulls chips back from the tip of the tool and out of the hole to prevent clogging
  • Spiral flutes for creating threads in blind holes
  • Higher helix angle improves chip removal
  • Available in UNC (Unified Coarse) or UNF (Unified Fine) right-hand thread options for different applications
  • Round shank with square end helps to minimize rotation in the tool holder

Product Description

The Union Butterfield 1587(UNC)/1587(UNF)/1588(UNC)/1588(UNF) uncoated, high-speed steel spiral flute tap has a round shank with a square end and a high-helix design, and is used to create right-hand threads in a range of materials with strength in brass, bronze, aluminum and unalloyed magnesium. It is available in two different ANSI thread specification standards: UNC (Unified Coarse) and UNF (Unified Fine). The spiral flutes of this tap pull chips back from the tip of the tool, up and out the hole to prevent clogging; the higher helix angle (52 degrees) further improves chip removal. These characteristics make the tap suitable for blind or bottoming holes .

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 provides 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 1587(UNC)/1587(UNF) series, taps with machine-screw sizes of 3 to 6 have two flutes, and machine-screw sizes 8 to 12 have three flutes. In the 1588(UNC)/1588(UNF) series, all taps have three flutes. In both series taps are available with a variety of chamfers. This tap conforms to ANSI standards and can create threads to a depth 2 ½ times its diameter. The 1588(UNC)/1588(UNF) series tap 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 that resist loosening, as in aerospace applications. The 1587(UNC)/1587(UNF) series tap is suitable for the ANSI 3B tolerance class.

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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