R 83931 Klass 5 (~8.8) UNC

R 83931 Klass 5 (~8.8) UNF

ASME B 18.2.1 UNF Klass 5 (~8.8) ZN

R 83931 Klass 5 (~8.8) ZN UNC

R 83931 Klass 8 (~10.9) UNC

R 83931 Klass 8 (~10.9) UNF