2006 = 2.006 inches.Ī variety of alloys to suit all applications. "22-" Prefix: The 4-digit part number is the actual O.D. of the seat is increased by the press fit for aluminum heads - 0.007 inches. "21-" Prefix: The 4-digit part number is the cutter size as above. ![]() of the seat is increased by the press fit for cast iron heads - between 0.0045 and 0.006 inches. "20-" Prefix: The 4-digit part number is the cutter size. Also, all seats have a fully finished inside diameter to assist gas flow and swirl. Q, N, and S series inserts are individually cast and have a true radius on the lead-in edge to facilitate the press fit. A cobalt-based alloy used in a very limited range of specialized applications where additional abrasion resistance is necessary. ![]() Our austenitic (non-magnetic) nickel-based alloy designed for natural gas, LPG, propane, and other extreme heat applications.ĭenoted by the suffix "N". All 20- and 21- prefixes without a suffix are cast in Q material. Our high-chrome alloy designed for unleaded fuels which enables Rockwell Rc40 hardness combined with easy machinability.įeatures excellent resistance to high temperature corrosion in applications to 1150☏.
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