... OQC, QA.4) supply special screws, nuts, bolts, rivets,studs,washers,standoffs,spacers,pins, shafts,and standard PEM,RAF electronic hardware & components ... OQC, QA.4) supply special screws, nuts, bolts, rivets,studs,washers,standoffs,spacers,pins, shafts,and standard PEM,RAF electronic hardware & ... Surface: plain, black, phosphate, zinc, hot dip galvanizing, dacromet, etc male-female standoff