Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts
Salvage

Community
Discussion Forums
Project Journals
Your Stories
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

  
Tractor Talk Discussion Board

Re: Old..Tap/drill guide

[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by Dave_Id on April 04, 2007 at 18:06:16 from (70.112.233.145):

In Reply to: Old..Tap/drill guide posted by Keith-OR on April 04, 2007 at 10:22:47:

The simplest yet is the old rule of thumb, tap drill size equals the diameter minus the pitch. 1/4-20, 20 threads per inch. 1 divided by 20 equals .050. So .250-.05 equals .200 inch which is about 13/64s. Works for every thread.

Replies:



Add a Reply

:
:
: :

:

:

:

: 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 ]

Home  |  Forums  |  Order Support


Today's Featured Article - Reflections of the Fifties - by "Country" Elliott. I remember rowing up in the 1950�s in a small, rural town in northwestern New Jersey. The closest town to ours was only 3 miles away, and there were seven dairy farms in the areas of these two country towns. We had 5 acres, and because my Dad was a salesman and not a dairy farmer, he let the Bockovens, who owned the Willow Tree Dairy farm most of our land. ... [Read Article]

Latest Ad: 1 SD Gibson, 1 D Model needs rear end assembled and installed, 1 D Model needs minor repairs, extra parts [More Ads]

Copyright © 1997-2026 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy