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Bottoming Taps are for hand and machine operation and commonly used in smaller shops or DIY that prefer “one tap fits all” approach. It is a High Speed Steel (HSS) industrial quality straight flute tap made for Alpha
Features / Benefits: The straight flute is the standard style of tap and is available in 3 types: Taper, Intermediate and Bottom, all 3 are suitable for a range of different tapping applications. As this basic tap will give acceptable performance in most materials and for medium sized production runs, it is usually the most economical tap to use. It can be especially beneficial when cutting short chipping material such as cast iron. A straight flute tap can be used in through or blind holes. Tap is made to 2N tolerances for optimum thread fit that balances fastener performance, manufacturing, economy and convenience
Ideal for: Steel, Aluminium, Copper, Brass, Not recommended for Stainless Steel
Also known as: 1st Tap
What is the difference between Taps?:
- Taper: 8 - 10 leads of thread used for starting a thread
- Intermediate: Less tapered, 4 - 5 leads, used to follow a Taper tap or for restoring threads
- Bottoming: Very little taper 1 1/2 - 2 1/2 leads, so will cut a new thread to the bottom of a blind hole, but the lack of taper makes starting a new thrad difficult
Manufactured in: EU
Cutting Fluid: When drilling into ferrous metals we recommend the use of a cutting fluid or compound to aid in the efficiency of the tap and to prolong its working life. We recommend Alpha CDT cutting fluid (Code ATL005)
Thread Pitch (Imperial):TPI stands for “threads per inch” which literally means the number of threads within each inch on a screw, a bolt, or a fastener. To determine the TPI of a screw, you simply count the number of threads contained within an inch of length. If the screw is less than an inch count upto ½” and x by 2
Difference between UNC v BSW Threads: UNC and BSW have the same thread per inch value, except for the 1/2" size. Theoretical it would be possible to interchange them as they have the same amount of threads per inch. However due to the difference in thread angle, the connection would not be as strong as when using the proper combinations
Specifications: Every effort has been made to ensure all specifications on our site are accurate and to the relevant standard, they should only be used as a guide. If you see any problems or wish to query something, please contact us
Additional Information: Click on the PDF for additional information
Photos: All photos are for illustration purpose only. Actual product may vary due to product enhancement
Updating our site: If you see any problems with any of our specifications or you require additional information please contact us
Disclaimer: Technical data and specifications were researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Fasteners Galore is not responsible for any loss, claim or damages arising therefrom. In developing this information, Fasteners Galore has made a determined effort to present it accurately
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Product	Hand Tap
Product Type	Bottoming Tap
Tap Type	Straight Flute
Tap Thread Size	5/16"
System of Measurement	Imperial
Thread Direction	Right Hand
Closest Size in mm	M8 (8mm)
Size x Pitch	5/16" x 18 TPI UNC
Thread Pitch	18 TPI
Thread Type	UNC / BSW - Coarse
Length L	72mm
Tapping Drill Size	6.60mm
Drive Square	4.90mm
Chamfer	Bottoming
Packaging	Supplied in a Plastic Pack
Material	High Speed Steel
Country of Origin	Europe
Standard	ISO529
Brand	Alpha
MPN	UNCHB516
UPC	9342386038989
Delivery	Free Shipping
Package Quantity	1