Alloys 'Q' Series:
Our high-chrome alloy designed for unleaded fuels which enables Rockwell Rc40 hardness combined with easy machinability.
Features excellent resistance to high temperature corrosion in applications to 1150°F. All 20- and 21- prefixes without a suffix are cast in Q material.
'N' Series:
Our austenitic (non-magnetic) nickel-based alloy designed for natural gas, LPG, propane, and other extreme heat applications.
Denoted by the suffix 'N'. Rockwell Rc45 and hot hardness to 1600°F.
'S' Series:
Our stellite series. A cobalt-based alloy used in a very limited range of specialized applications where additional abrasion resistance is necessary. Rockwell Rc53. Denoted by the suffix 'S'.
Engineered Advantages:
Q, N, and S series inserts are individually cast and have a true radius on the lead-in edge to facilitate the press fit. Also, all seats have a fully finished inside diameter to assist gas flow and swirl.
Sizes
'20-' Prefix: The 4-digit part number is the cutter size. 1562 = 1.562' or 1-9/16' cutter. Actual O.D. of the seat is increased by the press fit for cast iron heads - between 0.0045 and 0.006 inches.
'21-' Prefix: The 4-digit part number is the cutter size as above. Actual O.D. of the seat is increased by the press fit for aluminum heads - 0.007 inches.
'22-' Prefix: The 4-digit part number is the actual O.D. 2006 = 2.006 inches.
Qualcast engine manual
QUALCAST 25.4CC PETROL GRASS TRIMMER £ 0.60 – £ 19.99 Inc VAT. QGTP25 – BC260A – SAN: ZA. QGTP25 – BC260A Manual.
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