Common sizes (diamond height) include: 1/8”, 3/16”, 1/4”, 5/16", 3/8”, 1/2”, 5/8”, 3/4”, 1”. Logo is available in sharp face full character, low stress full character (round), low stress dot character, and sharp face dot character.
APIQ stands for American Petroleum Institute Quality. The American Petroleum Institute is one of the largest U.S. trade association's for the oil and natural gas industry. A company has to be certified by the API in order to stamp their products with this logo.
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