Re: Tap Drill Sizes

Posted by greywynd on March 18, 2005 at 00:13:01 from (216.209.119.152):

In Reply to: Taps/Easy outs posted by greywynd on March 17, 2005 at 09:42:40:

When I started this post, I was thinking more about the easy out/broken bolt/tap subject from a day or 2 ago. Seems like I started something, and there's a bit more I felt I should add, especially for those of you learning about this stuff from the basics.

When you go to drill a hole that you want to thread, there is a specific size of drill required depending on the thread size (diameter) and pitch (TPI, or threads per inch on standard imperial threads).

I'm sure that most of you have done a bit of wrenching on the tractor, or car, or whatever, and have realized that most bolt sizes can be either a fine, or coarse thread. The tap drill sizes for those 2 taps WILL be a different size. There is a whole bunch of math you can do to figure out the size, but, the easiest way is to look it up in a tap drill chart. If you go to an industrial supplier, they often have these charts available for you, often free. Get one, and make use of it. I also found a good one on the net, the link is below. If you only have a basic set of drills, here's another bit of advice....when you go to buy a tap of a certain size, buy a couple of the right size drills for that tap, and keep them all together. That way you won't have to look it up each time, and they be together when you need them.

Another thing that I would recommend that you guys get, is a variety of 'centre drills'. These are little short stubby drills with a small pilot on them, and they are designed to start a hole for the drill to follow. Tired of having a drill wander around when you go to drill a hole? Centre punch it, then use a centre drill to get started. They are strong enough that they won't generally break if you put some sideways pressure on it to get a hole started where you want it.

Mark

• tap drill chart

Follow Ups:

Post a Followup Name: E-Mail: Hide: Yes No Hiding your address protects you from spam generators but allows you to receive email response notifications. Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]