I don't know. I do know that the fastener that holds the blade on must be turned in the direction that the blade turns (when it's running) to take it off. Look to see which way the blade turns (you can tell by the cutting edges) and turn the fastener that direction to take it off. Think this through and you'll understand the applied physics behind this idea.
If you are talking about a fastener, it is 2" diameter, 16 threads per inch. This is considered an extra fine thread fastener.
Is a hub nut reverse thread
On the upper barrel, not including thread.
size threads per inch fit class
Metric fastener size designation nomenclature. As fully explained in ISO 965-1, Sect. 5, metric fastener size designations always begin with capital M or MJ followed by fastener nominal diameter and thread pitch, both in units of millimeters (mm), separated by the symbol "x", as follows. M10 x 1.5-6g-S means metric fastener thread profile M, fastener nominal size (nominal major diameter) 10 mm, thread pitch 1.5 mm, external thread tolerance class 6g, and thread engagement length group S ("short"). If referring to internal thread tolerance, "g" would be capitalized. A fit between threaded parts is indicated by internal thread tolerance class followed by external thread tolerance class separated by a slash; e.g., M10 x 1.5-6H/6g.
Left are reverse threaded.
No it is not reverse thread. The passenger side rear spindle is the reverse thread on 88-93 festivas.
Unless the type # is off the wall strange, it has a 1" diameter shaft, 1/4" keyway, the end is tapped to thread size 7/16 - 20, and length from mount to tip is 3 and 5/32".
Wall board screws. They have a course thread and a flat head.
A right-hand thread is a fastener, for example a screw, which is fastened by winding it (such as with a screwdriver) in a clockwise direction.
A grade denotes the mechanical properties of a screw - the materials used, size, direction of the thread and so on.
left hand thread