VDI 3400 Surface Finish – is a scale often used by German machine manufacturers and quite widely used in Spark and Wire Erosion (Verein Deutscher Ingenieure, the Society of German Engineers)

3400 30blood pressure hose

3400 30blood pressure

Facom 1/2" Drive Extra Long XZN (Triple Square) Bit Socket- M10 x 800mm (SV.8XL) - For XZN female drive fasteners. Non removable bit. Bright chrome finish with phosphate hardened tip. This 800mm (32") socket is used for transmission fasteners in tight spots.

Measurement of surface finishes is done with instruments called profilometers. Experience proves that measurement of surface finishes by comparison using a surface finish gauge does not give an error above 2 CH classes. The criteria of roughness are the Ra (Europe) – CLA (UK) – AA (USA) To obtain a grading of roughness, Charmilles has defined a CH scale, which is however cross referenced with the standards that are in common use.