ORIGINAL: center of the universe
I need a spinner nut for one of my planes but I do not understand the measurements given by tower hobbies
for example
SPECS Shaft Size: 1/4-28
Weight: 4oz
Diameter: 1"
Length: 1.5"
(
http://www2.towerhobbies.com/cgi-bin...8&I=LXL715&P=K )
what is 1/4-28 in metric and is this both the shaft diameter and lenght?
also
SPECS Shaft Size: 8x1.25mm
Weight: 2oz
Diameter: 7/8"
(
http://www2.towerhobbies.com/cgi-bin...8&I=LXL736&P=K )
I'm guessing that the eight is the diameter but what does 1.25mm describe?
The engine I need this for has a 6.2mm diameter and without the prop and all it´s 32.8
in length, what would that be in that system?
(also I know the links to those nuts isn´t maby what fits the engine but they are examples)
¼ - 28 is a standard SAE thread, with a quarter inch shaft diameter and 28 threads per inch. No metric nut will fit those threads.
M8 x 1.25 is a Metric standard for an 8mm diameter shaft. The thread pitch is 1.25 mm per thread.
Are you sure that 6.2mm shaft isn't actually a quarter inch? There are thread pitch gauges made in metric and SAE, with which you can determine the threads.
Good luck,
Dave Olson