Mirror Finish/Buff
1 to 4 Ra

The finest mirror finish. Used mainly for finishing parts where cosmetic appearance is critical.
(Equivalent to a 1200 grit or better polish)

Light Finish/Buff
10 Ra

Close to a mirror polish but with less shine. Typically used on molds that produce cosmetically finished parts.
(Equivalent to 600 to 1200 grit polish)

600 Grit Paper
10 Ra

The highest finish before the buffing process. Mostly used on highly cosmetic parts that are to be chrome plated or painted.

400 Grit Paper
10 Ra

Close to a 600 grit paper finish, but with a deeper directional pattern. Less shine than a 600-paper finish.

320 Grit Paper
14/15 Ra

Close to a 400 grit paper finish, but with a deeper directional pattern. Less shine than a 400-paper finish. It is typically referred to as a #4 pharmaceutical finish.

240 Grit Paper
< 32 Ra

Close to a 320 grit paper finish, but with a deeper directional pattern. Less shine than a 320-paper finish. This finish is also sometimes called a #4 pharmaceutical finish.

180/150 Grit Paper
33/50 Ra

Close to a 240 grit paper finish, but with a deeper directional pattern. Less shine than a 240-paper finish. This is sometimes referred to as a #4 sanitary finish.

100/120 Grit Paper
50/70 Ra

Close to a 180/150 grit paper finish, but with a deeper directional pattern. Less shine than a 180/150-paper finish. It is sometimes referred to as a #3 Architectural finish.

60/80 Grit Paper
80/100 Ra

Close to a 100/120 grit paper finish, but with a deeper directional pattern. Less shine than a 100/120-paper finish. It is also called a #2 Satin finish.

36 Grit Paper
150 + Ra

The deepest and roughest finish used to remove gating, parting lines and mill scale from metal plates, bars, tubes and castings. Usually this operation is not a finish operation as much as it is a processing operation used to prepare a part for either machining or to meet drawing requirements. It's also known as a #1 finish.