... spacers,pins, shafts,and standard PEM,RAF electronic hardware & components.5) used in many industries: electronic, computer, automobile, machinery, ... ,pins, shafts,and standard PEM,RAF electronic hardware & components.5) used in many industries: electronic, computer, automobile, machinery, ... . Grades: SAE J429 Gr. 2, Gr5 , Gr.8, class 5, class 6, class 10, etc.3. Surface: plain, black, phosphate, zinc, ...