Posted by Billy NY on September 10, 2012 at 16:16:02 from (67.248.100.3):
Well, someone here ought to know these, here goes:
1.) Common grease zerk size for a typical pto universal joint, for some reason I can't match it up, the hexagonal portion of it measures 9/32, a 1/4-28 fitting will fit in the hole, and partially thread, then stop or you will gall the threads. I have one of these left on the shaft, the other must have flew out. At the threads it measured, 0.233" on the digital micrometer just below the hex and 0.19" at the last thread or bottom of thread. Thread pitch gauge appears to read 28 TPI, so it looks tapered has to be a common size right, NPT ? Tapered ? I did look on Lincoln's site, there is a nice reference .pdf file for fittings.
2.) What is the correct drill bit size for tapping a 5/16"-18 hole in steel, going to mount a rear work light so I can see better, just know I'll be out there on this old tractor at night.
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