Q: What does the R in example AN525-10R24 screw stand for? Are all AN525 screws the high tensile strength of 125,000b?
The R stands for Recessed (Phillips) Head Steel Screw.
Steel Spec: High Tensile Strength of 125,000 PSI
Alloy Spec: High Tensile Strength of 62,000 PSI
Q: Are these AN525 washers stainless steel?
No, these are made of cadmium plated steel.
Q: Are these rustproof? Or at least resistant?
The AN525-832R4 are cad plated, which would resist rust until it eventually wears off.
Q: What nylock type nuts would fit these?
AN365-832A