GB/T 6170 Thread Specification M1.6~M64, Performance Grade 6/8/10, Tolerance Grade A (d ≤ 16mm)/Grade B
The most commonly used hex nut, with a thickness of about 0.8d (thread diameter), is used in conjunction with bolts/screws. A-level high precision, used when d ≤ 16mm; B-class is used for larger specifications. Surface treatment can include galvanizing, blackening, hot-dip galvanizing, etc. Widely used for connecting various types of machinery, buildings, and equipment.
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