N1 (1.854mm) N2 (2.184mm) N3 (2.515mm) N4 (2.845mm) N5 (3.175mm) N6 (3.505mm) N8 (4.166mm) N10 (4.826mm) 1/4 (6.35mm) 5/16 (7.938mm) 3/8 (9.525mm) 7/16 (11.113mm) 1/2 (12.70mm) 5/8 (15.875mm) 3/4 (19.050mm)

3/32 (2.381mm) 1/8 - 3.175mm 5/32 (3.969mm) 3/16 (4.763mm) 1/4-6.35mm 5/16 -7.938mm 7/16-11.113mm 3/8-9.525mm 1/2-12.700mm 5/8-15.875mm 3/4-19.050mm 7/8-22.225mm 1''-25.4mm 1"1/4-31.750mm 1"1/2-38.10mm 1"3/4-44.450mm 2"-50.800mm 2"1/4-57.150mm 2"1/2-63.500mm 2"3/4-69.850mm 3"-76.200mm 3"1/4-82.500mm 3"1/2-88.900mm 3"3/4-95.250mm 4"-101.800mm 4"1/2-114.300mm 5"- 127mm 5"1/2-139.700mm 6" - 152.400mm

UNC (STANDARD) UNF (PAS FIN)