This is for a brand new  #924-315
Brass 5/16x24 Thread
Prop Spinner Nut with a 1" hex.
Heavy Weight is approx 88.5 gr -- 3.1 oz
A fairly common size, is used mostly on .60 and larger size engine --- Check your engine.

This is the size used mostly on .60 (10cc) and larger glow engines. Like RJL K.61, Kraft .61, Forster 99, Some Larger Fox, Webra, and others.

Check our store listings for
different thread and hex sizes.

THE CHART BELOW SHOWS THE OTHER SIZES MADE BY MECOA K&B MFG