O-ring sealing surfaces(maximum surface roughness)(Bores)

O-ring sealing surfaces, including all gr ooves and bores, shall have a maximum surface roughness
average value (R a) of 1,6 mm (63 micro inches) for static O-rings and 0,8 mm (32 micro inches) for the surface against which dynamic O-rings slide.

Bores shall have a minimum 3mm (0,12 in) radius or a minimum 1,5 mm (0,06 in) chamfered lead-in for static O-rings and a minimum 2 mm (0,08 in) chamfered lead -in for dynamic O-rings.

Chamfers shall have a maximum angle of 30°.