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  • Union Butterfield 1528(UNC)/1528(UNF)/1528(UNS) High-Speed Steel Hand Tap, Uncoated (Bright) Finish, Round Shank with Square End
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Union Butterfield 1528(UNC)/1528(UNF)/1528(UNS) High-Speed Steel Hand Tap, Uncoated (Bright) Finish, Round Shank with Square End

Available in multiple versions

7 customer reviews

Price: $3.07 - $21.00
Product Specifications
Brand Name Union Butterfield
Material Type High Speed Steel
Finish Types Uncoated (Bright)
Shank Type Round With Square End
UNSPSC Code 27112806

The Union Butterfield 1528(UNC)/1528(UNF)/1528(UNS) uncoated, high-speed steel hand threading... Read full product description



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Product Features

  • Hand threading tap with straight flutes cuts threads in through holes and blind holes
  • Machine-screw tap sizes, in frequent demand for many industries and products
  • Available in UNC (Unified Coarse), UNF (Unified Fine) or UNS (Unified Special) right-hand thread options for different applications
  • High-speed steel is compatible with a variety of materials
  • Uncoated (bright) tools have no additional surface treatment or coating, for use on a broad range of materials

Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B004J4VUMU
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (7 customer reviews)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

The Union Butterfield 1528(UNC)/1528(UNF)/1528(UNS) uncoated, high-speed steel hand threading tap has straight flutes and a round shank with a square end, and is used to create machine-screw sized right-hand threads in a range of materials. It is available in three different ANSI thread specification standards: UNC (Unified Coarse), UNF (Unified Fine), or UNS (Unified Special). The straight flutes are suitable for threading through holes (extending through the workpiece) and blind or bottoming holes (with only one opening). Machine-screw sizes are used frequently in many industries and products.

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 provides an economical alternative to coated tools. The round shank with square end makes it suitable for hand or power-driven applications. 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 1528(UNC) series, taps that are machine-screw size 1 have two flutes; sizes 2 through 6 are available in two or three flutes; sizes 8 and 10 are available with two, three, or four flutes; and size 12 has 4 flutes. In the 1528(UNF) series, taps that are sizes 0 and 1 have two flutes; sizes 2, 3, and 4 have three flutes; sizes 5 and 6 are available in two and three flutes; size 8 has four flutes; size 10 is available in two, three, and four flutes; and size 12 has four flutes. UB 1528(UNS) taps are available in size 4, with three flutes. Taps in these series are available with a variety of chamfers. This tap conforms to ANSI standards and can create threads to a depth 1 ½ times its diameter. It 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.

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.


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

Size: #6-40 Verified Purchase
I have been a Precision Machinist for forty years. This tap is fine for limited use. If you foresee a need for a more durable high usage tap, I would recommend a Cobalt, coated tap. Like driving a car, you need to use it with caution and proper technique. Or it will surely bite you, and break.
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Size: #8-32 Verified Purchase
I use this hand tap for acrylic pieces. It stays sharp when using on a softer material. Softer materials tend to produce larger fragements, channels could be slight larger to compensate for this.
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By W. Wiencke on November 24, 2012
Size: #3-48 Verified Purchase
It snapped after doing the second hole.

Naturally it could be my error but I've been tapping holes for quite a while and generally use a tapping jig and watch for any distortion.
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Size: #3-48 Verified Purchase
It was just what I expected. It worked well, and was a good price.
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