5/16" Dia.
1" 0.312"-0.318" 0.062" Rockwell C43 10,800 lbs ASME B18.8.2 50 98296A939 6.28 50 90692A757 8.22
Breaking strength of 5/16 roll pin (McMaster-Carr) Breaking strength is breaking strength, brittle or not.
The stock pin, .25 Dia, even if it's 120,000 psi shear strength, (which it ain't) yields at around 5900 Lbs. Also, the fact there is little or no radius at the step, it has a stress riser built in.
If the roll pins is considered technically brittle:
Brittle, in the strength of materials world, does not necessarily mean it has lower strength. Mostly it connotates to higher strength.
I think what Jerry is getting at is that a roll pin has a specific function, which doesn't include the way it is being used here specifically. However, once the shifter arm is in its saddle and the spring, cup and retainer hood is on, isn't its only function is to keep the assembly together and centered? The shifting action seems to be not connected to these roll pins or guides.
