Hydraulic stops on a cub loboy

Dave H (MI) · Dec 29, 2010

Since the inserts and helicoils made the cost of the replacement part look positivly cheap, I felt pretty comfortable trying to fix this thing on my own. Apparently the thumb screw on the sliding stop had been turned in too hard at some point because the threaded insert was gone leaving a big hole that needs to be small enough for a 10-24 thumb screw. I made my own insert. I tapped out the body of the stop with a 3/8 tap. Screwed in a 3/8 bolt as tight as I could. Cut the bolt off and ground it flush. Now I need to drill a hole in the center that I can tap with a 10-24 tap. Would anyone know what size drill to use so that I don't make it too large? 10-24 threads are pretty fine. Not a lot of margin for error.

Jim Becker · Dec 29, 2010

If you google "drill tap size chart" you find several sources for the right answer, which is a #25 drill. It usually is marked on the tap, but might be pretty small on a 10-24.

Here is one chart:
http://www.boltdepot.com/fastener-information/us-tap-drill-size.aspx

Janicholson · Dec 29, 2010

It is a number drill size 25. That is pretty much the answer. 9/64th is .1406" 5/32 is .1562" and the size needed is .1495" (which is #25 drill.)
There is no room for error on this (really, I thread this size often, and different is bad. Ude tap majic brand fluid on the tap. Jim

ScottyHOMeY · Dec 30, 2010

Dave Im on baord with with Jim. If you can scare up a #25, that's the way to go. That's a small screw with a fine thread, in a soft metal -- you want the right size drill to leave yourself as much thread as possible to suit the purpose.

You can usually find them at a local industrial supplier if you have somebody like a local version of McMaster-Carr that supplies the building/mechanical/welding trades. It's definitely not something Spars, Rubberguts & Co. would carry.

Dave H (MI) · Dec 30, 2010

Many thanks Jim, Scotty and all! I will make a couple stops today and see what I can scare up. This is something that I can wait on until I can find the right drill.

Hydraulic stops on a cub loboy

Dave H (MI)

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Jim Becker

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Janicholson

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ScottyHOMeY

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Dave H (MI)

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