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Union Butterfield 1590(UNC)/1590(UNF)/1591(UNC)/1591(UNF) High-Speed Steel Spiral Flute Tap, Heavy-Duty, Black Oxide Finish, Round Shank with Square End

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Product Specifications
Surface Coating
Steam Oxide
Shank Type
Round With Square End
Pitch Diameter Limit
H3
Material Type
High Speed Steel
UNSPSC Code
27112806
Brand Name
Union Butterfield

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Currently showing 1-20 of 34 Next 14 »
Thread Size Thread Type Manufacturer Series # Chamfer Type Number of Flutes Shank Diameter Length of Threads Overall Length Mfr Part # ASIN

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Currently showing 1-20 of 34 Next 14 »
#6-32 UNC 1590(UNC) Plug 2 0.141" 0.6875" 2" 1010937 B003JY6C0Q yes $12.67 Buy Options
#6-32 UNC 1590(UNC) Bottoming 2 0.141" 0.6875" 2" 1010938 B003JY6C1K yes $13.04 Buy Options
#6-40 UNC 1590(UNF) Plug 2 0.141" 0.6875" 2" 1010939 B003JY6C6K yes $12.67 Buy Options
#6-40 UNC 1590(UNF) Bottoming 2 0.141" 0.6875" 2" 1010940 B003JY6C7E yes $12.67 Buy Options
#8-32 UNC 1590(UNC) Plug 2 0.168" 0.75" 2.125" 1010941 B003JY6C2E yes $13.04 Buy Options
#8-32 UNC 1590(UNC) Bottoming 2 0.168" 0.75" 2.125" 1010942 B003JY6C2Y yes $13.04 Buy Options
#8-36 UNF 1590(UNF) Bottoming 2 0.168" 0.75" 2.125" 1010944 B003JY6C8S yes $12.67 Buy Options
#8-36 UNC 1590(UNF) Plug 2 0.168" 0.75" 2.125" 1010943 B003JY6C7Y yes $13.04 Buy Options
#10-24 UNC 1590(UNC) Plug 3 0.194" 0.875" 2.375" 1010945 B003JY6BXY Usually ships in 1 to 2 months $12.67 Buy Options
#10-24 UNC 1590(UNC) Bottoming 3 0.194" 0.875" 2.375" 1010946 B003JY6BY8 Usually ships in 1 to 2 months $13.04 Buy Options
#10-32 UNC 1590(UNF) Plug 3 0.194" 0.875" 2.375" 1010947 B003JY6C3I yes $13.58 Buy Options
#10-32 UNC 1590(UNF) Bottoming 3 0.194" 0.875" 2.375" 1010948 B003JY6C4M yes $13.93 Buy Options
#12-24 UNC 1590(UNC) Bottoming 3 0.22" 0.9375" 2.375" 1010950 B003JY6BZW yes $12.39 Buy Options
#12-24 UNC 1590(UNC) Plug 3 0.22" 0.9375" 2.375" 1010949 B003JY6BZC yes $12.39 Buy Options
#12-28 UNC 1590(UNF) Plug 3 0.22" 0.9375" 2.375" 1010951 B003JY6C4W yes $14.47 Buy Options
#12-28 UNC 1590(UNF) Bottoming 3 0.22" 0.9375" 2.375" 1010952 B003JY6C5Q yes $12.39 Buy Options
1/4"-20 UNC 1591(UNC) Bottoming 3 0.255" 1" 2.5" 1010954 B003JY6CBK yes $13.54 Buy Options
1/4"-20 UNC 1591(UNC) Plug 3 0.255" 1" 2.5" 1010953 B003JY6CAQ Usually ships in 1 to 2 months $13.54 Buy Options
1/4"-28 UNF 1591(UNF) Plug 3 0.255" 1" 2.5" 1010955 B003JY6CHY yes $13.54 Buy Options
1/4"-28 UNF 1591(UNF) Bottoming 3 0.255" 1" 2.5" 1010956 B003JY6CII yes $7.41 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
  • Black oxide finish improves lubricity, resists corrosion, and helps prevent buildup
  • Heavy-duty design is suitable for tougher materials
  • Available in UNC (Unified Coarse) or UNF (Unified Fine) right-hand thread options for different applications

Product Description

The Union Butterfield 1590(UNC)/1590(UNF)/1591(UNC)/1591(UNF) high-speed steel heavy-duty spiral flute tap has a round shank with a square end and a black oxide finish, 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 40-degree spiral flutes on this tap pull chips back from the tip of the tool up and out the hole to prevent clogging. This characteristic makes the tap suitable for blind or bottoming holes (with only one opening). The heavy-duty design (slower helix angle, large core diameter, and wider flute throat) makes it suitable for tougher materials in which average- or fast-spiral designs perform marginally. The black oxide finish of this tool will not chip. It improves lubricity, resists corrosion, and helps to prevent buildup and welding on the cutting edge of the tool.

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. 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 1590(UNC)/1590(UNF) series, taps with machine-screw sizes 6 and 8 have two flutes; machine-screw sizes 10 and 12 have three flutes. In the 1591(UNC)/1591(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. It is suitable for the ANSI 3B tolerance class: 3B produces close-tolerance fasteners that resist loosening, 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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