Why would a metric pitch be a part of an inch, when the system is … metric? Metric tap size M6X1 simply means the tap has a 6 mm maximum diameter and there is 1 thread per 1 mm. Another example, M20x2. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Guides Blog Products Contact Us. The differences are: Coarse theads have fewer threads per inch than fine threads.
Coarse threads are more common, and more shops will have coarse taps. Coarse threads are less likely to cross-thread, or jam because the screw is inserted at an angle. Screws with fine threads are slightly stronger. It is generally used for thin-walled parts and parts with higher anti vibration requirements.
It has unique advantages in some rough operation applications that require quick assembly or disassembly and are easy to produce corrosion and damage.
Application of UNF Unified fine thread The UNF thread has smaller pitch than the UNC thread with the same nominal specification, higher thread strength, smaller space occupation size and better self-locking performance. The formula for working out the OD of a number thread is: x 0. As with other thread series', there are both standard coarse and fine thread pitches, as well as specials as you've discovered.
I have no idea who came up with this system or why, and I'm too lazy to look it up now. Any ideas, anyone? Google it. There are only a couple of places that sell the tap. I have bought a couple,,,spendy,,,,,can't remember where I bought though. Originally Posted by Jim Denney. I have new tiny 00 size taps and dies and 14 was still common when I was young. Schrader valves are about as old as "balloon" tires and have a finer than NF pitch because of the thin wall of the valve body.
Note that the Fine series has over ridden the UN fixed designation. Disclaimer: This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. To purchase a copy visit an Authorized Reseller.
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