I need some help tracking down a good Decimal Equivalent Chart wall poster; the kind that many machine shops have.
While I've already have memorized most of the course-thread tap and close-fit tolerances for #4 through 1/4-20, it would be nice to have a good wall poster with all the tap, close-fit, free-fit information on it, as well as the decimal/letter/number drill size equivalents.
Bonus points if it has separate hole diameter information for tapping softer materials at 75% and harder materials at 50% thread, as well as information like the minor and major diameter information for common screw sizes. Even more bonus points if it also has the above for imperial
and metric, although if you find a good secondary poster with just metric information that's fine.
While I love Machinery's Handbook, just having a quick wall reference could save a lot of time.
