The A-810 friction lock control is similar to the A-800 control but with 1/4-28 threaded end (non-swiveling). With Teflon™ liner. Travel: 3-3/8". The 1-1/4" dia. solid knob is available in black or blue (blue knob has smooth profile, not FAA style). 1/2" panel thread. Lengths are measured from under panel nut to end of threaded shaft with knob pushed in.
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No, these controls are not FAA Approved. There are some A-800 controls that are FAA Approved for installation in Cessna aircraft.
The threaded end of the A-810 throttle controls are 1/4-28 thread. You can confirm this by measuring the diameter of the threads. If it measures 1/4 then it is correct, if it measures .19 then that would mean that it would be 10-32. brbr In this case it should measure .25.