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Union Butterfield 1585(UNC)/1585(UNF) High-Speed Steel Spiral Point Tap, Relieved Style, 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
Brand Name
Union Butterfield

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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 56 Next 20 »
1/4"-20 UNC 1585(UNC) Plug 2 0.255" 1" 2.5" H2 1010291 B003JY67P6 1 $10.21 Buy Options
1/4"-20 UNC 1585(UNC) Plug 3 0.255" 1" 2.5" H1 1010290 B003JY67OC 1 $10.39 Buy Options
1/4"-20 UNC 1585(UNC) Bottoming 2 0.255" 1" 2.5" H3 1010294 B003JY67QU 1 $11.11 Buy Options
1/4"-20 UNC 1585(UNC) Plug 3 0.255" 1" 2.5" H5 1010296 B003JY67TC 1 $12.64 Buy Options
1/4"-20 UNC 1585(UNC) Plug 2 0.255" 1" 2.5" H5 1010293 B003JY67S8 1 $10.85 Buy Options
1/4"-20 UNC 1585(UNC) Plug 3 0.255" 1" 2.5" H3 1010295 B003JY67RE 1 $10.52 Buy Options
1/4"-20 UNC 1585(UNC) Plug 2 0.255" 1" 2.5" H3 1010292 B003JY67PQ 1 $9.41 Buy Options
1/4"-28 UNF 1585(UNF) Plug 3 0.255" 1" 2.5" H4 1010303 B003JY68IC 2 $9.67 Buy Options
1/4"-28 UNF 1585(UNF) Plug 2 0.255" 1" 2.5" H4 1010300 B003JY68HS 1 $10.28 Buy Options
1/4"-28 UNF 1585(UNF) Plug 2 0.255" 1" 2.5" H3 1010299 B003JY68FU 1 $8.28 Buy Options
1/4"-28 UNF 1585(UNF) Plug 3 0.255" 1" 2.5" H2 1010302 B003JY68EQ 2 $10.77 Buy Options
1/4"-28 UNF 1585(UNF) Plug 2 0.255" 1" 2.5" H2 1010298 B003JY68DW Temporarily out of stock. Order now and we'll deliver when available. $7.72 Buy Options
1/4"-28 UNF 1585(UNF) Plug 2 0.255" 1" 2.5" H1 1010297 B003JY68CS 2 $11.12 Buy Options
1/4"-28 UNF 1585(UNF) Bottoming 2 0.255" 1" 2.5" H3 1010301 B003JY68GY 1 $12.33 Buy Options
5/16"-18 UNC 1585(UNC) Plug 2 0.318" 1.125" 2.7188" H1 1010304 B003JY67ZG 1 $11.40 Buy Options
5/16"-18 UNC 1585(UNC) Bottoming 2 0.318" 1.125" 2.7188" H3 1010308 B003JY681O 1 $11.84 Buy Options
5/16"-18 UNC 1585(UNC) Plug 2 0.318" 1.125" 2.7188" H5 1010307 B003JY683M 1 $10.82 Buy Options
5/16"-18 UNC 1585(UNC) Plug 3 0.318" 1.125" 2.7188" H3 1010309 B003JY682I 1 $11.98 Buy Options
5/16"-18 UNC 1585(UNC) Plug 2 0.318" 1.125" 2.7188" H3 1010306 B003JY680U 1 $9.39 Buy Options
5/16"-18 UNC 1585(UNC) Plug 2 0.318" 1.125" 2.7188" H2 1010305 B003JY6800 2 $10.77 Buy Options

Key Features

  • Spiral point tap pushes chips ahead of tool to reduce clogging
  • Spiral point tap with straight flutes for cutting threads in through holes
  • Relieved-style design reduces friction between tap and workpiece for reduced tool wear
  • Round shank with square end helps to minimize rotation in the tool holder
  • Available in UNC (Unified Coarse) and UNF (Unified Fine) right-hand thread options for different applications

Product Description

The Union Butterfield 1585(UNC)/1585(UNF) uncoated, high-speed steel spiral point tap has a relieved-style 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 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). Relieved-style design reduces the friction between tap and workpiece for longer tool life.

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 1585(UNC) and 1585(UNF) tap series, taps with 1/4” to 5/16” nominal diameters are available in two or three flutes, and those with 3/8” to 3/4” nominal diameters have three flutes. They are available with a variety of chamfers. These taps conform to ANSI standards and can create threads to a depth 2 ½ times their diameter. They are 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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