VSCH-G VSCH-M VSCH-G/W VSCH-M/W Locking screw Locking screw Locking screw Locking screw with internal hexagon male thread G / DIN ISO 228 stud face form B thread: G1/8 - G1 1/2 with internal hexagon male thread M / DIN 13 stud face form B thread: M10x1 - M48x2 with internal hexagon male thread G / DIN ISO 228 stud face form E with Viton Seal soft ring thread: G1/8 - G1 1/2 with internal hexagon male thread M / DIN 13 stud face form E with Viton Seal soft ring thread: M10x1 - M48x2