For using different threaded components together

PART #                THREAD         DIA.      HT.          A         
R20-6-SOA           1/4"-20        1.0"       1.0"        6mm
R20-8-SOA           1/4"-20        1.0"       1.0"        8mm
R20-10-SOA         1/4"-20        1.0"       1.0"      10mm
R20-12-SOA         1/4"-20        1.0"       1.0"      12mm

PART #               THREAD        DIA.      HT.          A            
R20-516-SOA       1/4"-20         1.0"       1.0"    5/16"-18
R20-38-SOA         1/4"-20         1.0"       1.0"     3/8"-16
R8-14-SOA             M8          25mm     25mm     1/4"-20