Includes martensitic stainless steel alloy nuts of 1/4 in. All markings shown for all grades of A1. When nuts are machined from bar stock, the nut must additionally be marked with the letter . The letters H and M indicated heat treated nuts. Properties shown are those of coarse and 8- pitch thread heavy hex nuts.
Heavy hex nuts a194 grade 6. Designation: A194/A194M – 11. 6.3.2 Grade 1 and 2 nuts made by hot forging or by machining from. Hardness numbers are Brinell Hardness. All nuts shall bare the manufactures identification mark. Nuts shall be legibly on one face to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing serfaces is not permitted unless agreed upon between manufacturer and purchaser. Nut coated with zinc have an asterisk (*) maked after the grade symbol. Nuts coated cadmium shall have a plus sign (+) marked after the grade symbol. Other less common grades exist but are not listed.
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December 2016
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