BSW MACHINE SCREW 2A, M/M MACHINE SCREW 2A , BA MACHINE SCREW 2A, SM MACHINE 2A, UNC MACHINE SCREW 2A, UNF MACHINE SCREW 2A WOOD SCREW SIZE M/M TYPE DIN WOOD SCREW DIN TYPE SQUARE AND HEX LAG SCREWS WOOD SCREW ASA TYPE TAPPING SCREW SIZE tapping thread rolling die