What thread!?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=189876
Printed Date: 10 Sep 2025 at 9:59am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: What thread!?
Posted By: INV3RSE
Subject: What thread!?
Date Posted: 04 Aug 2022 at 4:59am
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Hi everyone I need to order a tap and dye set to clean up a few bolts and holes on my ED-40 Trouble is I’m not sure if the thread and don’t want to get the wrong size! Anyone know if they are BSW or UNF or UNC? Thanks 😊 |
Replies:
Posted By: Gary
Date Posted: 04 Aug 2022 at 5:16am
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My guess for that era would be UNC. If you could obtain P/N's for the particular bolts from an ED-40 Parts Catalog, they could be compared to a North American built Allis. Gary |
Posted By: steve(ill)
Date Posted: 04 Aug 2022 at 8:58am
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we sent a LOT of equipment to England during WW II....... Due to that , they started converting a lot of manufacturing to UNC instead of British Standard.... "SOME" companies were slow to conform, buy many did...... I would get a couple 3/8 and 1/2 inch bolts and "test fit" them in specific holes that you know are good, to confirm the size. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 04 Aug 2022 at 9:04am
also, wire brush the head and look at the markings... Many British bolts were marked by their manufacture as BW or UNC .... or manufacturer letters. ------------- Like them all, but love the "B"s. |
Posted By: INV3RSE
Date Posted: 04 Aug 2022 at 11:45am
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Thanks guys great reply’s here. Not sure why I didn’t think this before but Iv just had a look through the literature and sure enough almost every bolt is shown as UNF or UNC. Thanks for the help everyone 😊 
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