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# surface finish

## surface finish

(OP)
looking for info on the heidelberg hatch system of surface finish, the symbols look like upside down triangles.
i am trying to convert it to microinches,micrometers or the "N" roughness grade numbers. i believe 3 triangles = 32 microinch finish. a chart would be helpful

### RE: surface finish

Triangles give a rather broad range of surface finishes.  Their equivalents are as follows:

1 Triangle = 500 m inch  = N10=12.5   m meters
= 250 m inch  = N9 = 6.3   m meters
2 Triangles= 125 m inch  = N8 = 3.2   m meters
=  63 m inch  = N7 = 1.6   m meters
3 Triangles=  32 m inch  = N6 = 0.8   m meters
=  16 m inch  = N5 = 0.4   m meters
=   8 m inch  = N4 = 0.2   m meters
4 Triangles=   4 m inch  = N3 = 0.1   m meters
=   2 m inch  = N2 = 0.05  m meters
=   1 m inch  = N1 = 0.025 m meters

Each Triangle encompasses a range of surface finishes.  Two triangles are used to denote a surface finish from 125 micro inches to anything over 32 micro inches.

### RE: surface finish

Can someone assist me in in identifying the finish required by a single triangle and the symbol Rz25

### RE: surface finish

Rz25 means the specifies the mean surface finish is 25 m meters, or 1000 m inch.

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