FERROUS & NON-FERROUS METALS
Stambaugh Metal, Inc. . Ph: 717.632.5957 . Fax: 717.632.9502
SPECS
Stambaugh Metal has the capabilities to meet many industry standards and engineering specifications as listed on the Finish Surface Cross Reference Guide below. Since there are many variables such as raw materials, pressure applied to the parts, and differences in machines, the charts below can only approximate the conversion.
Metal Polishing Specifications
Finish Surface Cross Reference Guide
RMS
(Micro-Inch)
RMS
(Micron)
RA
(Micron-Inch)
RA (Micron)
Grit Size

# Finish Designation

80
2.03
71
1.8
80
#3 Finish
This is a polished finish obtained by finishing the metal with an 80 to 100 grit abrasive, generally used as a semi-final finish. This is often used for architectural components and food processing/kitchen equipment.
58
47
1.47
1.2
52
42
1.32
1.06
120
150
#4 Finish
This finish is a general purpose, polished bright finish. The final finish is generally done with abrasives having a particle size of 120 to 150 grit, following the initial grinding with coarser abrasives. The finish is often used for architectural wall panels and kitchen equipment.
#6 Finish
This is a soft (dull) satin finish, with lower reflectivity than the #4 finish. This finish is produced by brushing the #4 finish on the material, using a medium abrasive and oil. This finish is often used in architectural and ornamental applications where a higher luster is not desired. It is often used with stainless steel furniture.
34
17
14
0.86
0.43
0.36
30
15
12
0.76
0.38
0.3
180
240
320
#8 Finish
The most reflective finish commonly produced on sheet, also known as mirro or polished, this is the highest reflective finish available. It is produced by polishing with successively finer abrasives, then buffing with very fine buffing compounds or rouges. The surface is essentially free of grit lines from the preliminary grinding operations, though, at certain angles, some may still be visible. This finish is used primarily for decorative purposes such as architectural parts, small mirrors and reflectors. This is also the finish one would choose to plate over.
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