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Class	Commercial designation grade	* Typical machining operations	* Typical materials	Typical cuts
Class	Commercial designation grade	* Typical machining operations	* Typical materials	Low speed	Tool feed
1	C-1	Heavy duty roughing cuts by turning milling, shaping and planing under favorable machining conditions	Low hardness- gray cast iron, metal that generate short chips, non-ferrous metals, low tensile strength steel, stainless steel, non-metallic materials	Low	Coarse
2	C-2	Semi-roughing and general purpose machining by turning, milling, shaping, planning, and boring	Gray cast irons having hardnesses up to Rockwell C 20 non-ferrous metals, titanium metals, high temperature steel alloys, monel, bronze, alloys, brasses	Medium	Medium
3	C-3	Semi-finishing and finishing cuts by turning, milling, drilling, boring, and broaching	Gray cast irons over Rockwell C 20 hardness, malleable iron and modular iron that generates short chips, hardened steel, silicon aluminum alloys, titanium metals, plastics, hard rubber, fiberglass	Medium �to high	Medium �to high
4	C-4	Finishing cuts, precise dimension control, and best surface finishes by turning, boring, and milling	Very hard gray iron castings and chilled castings harder than Rockwell C 60, high silicon aluminum alloys, hardened steel, highly abrasive plastics, phenolic laminates, ceramics	High	Fine
5	C-5	Heavy duty roughing cuts by turning, rolling, shaping, and �planing under unfavorable machining conditions	Carbon and alloy steel, steel castings with cored sections, cavities, sand inclusions, malleable iron that generates relatively long chips	Medium �to low	Medium �to low
6	C-6	Semi-roughing and general purpose machining by turning, milling, shaping and planing	Carbon and alloy steels, steel castings, malleable iron that generates relatively long chips	Medium	Medium
7	C-7	Semi-finishing and finishing cuts by turning, milling, threading and boring	Carbon and alloy steels, steel castings, stainless steels, malleable and modular irons that generate relatively large chips	Medium �to high	Medium �to high
8	C-8	Fine finishing cuts, fine surface finishes, and precise dimension control by turning and boring. Precise threading by high speed, single point threading machines	Carbon and alloy steels, steel castings	High	Fine

Note: �Typical operations� and �Typical materials� are listed in the approximate order of decreasing frequency of usage, i.e. most frequent applications are listed first followed by less frequent applications.