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Common fastening set for industrial and construction use.
Thread Specifications and Performance Grades
The thread specification range for hex bolts is M1.6~M64, which can be fully threaded. Performance grades include 5.6, 8.8, 9.8, 10.9, A2-70, A4-70, A2-50, A4-50, CU2, CU3, AL4, etc. Among them, Grade A is suitable for bolts with a diameter of d = 1.6mm~24mm and a length of l ≤ 10d or l ≤ 150mm, while Grade B is suitable for bolts with a diameter greater than 24mm or a length exceeding the above range.
Nominal Diameter and Thread Dimensions
Taking an M8 stainless steel hex bolt as an example, its actual shank outer diameter is 7.76~7.972mm. The thread major diameter, pitch diameter, and minor diameter can be calculated according to the standard. Bolts of different diameters correspond to different head sizes and wrench specifications, which can be selected with reference to the standard size table.
Bolt Length and Marking Method
The length of a hex bolt is usually expressed as the nominal length. For example, for a fully threaded M12×80mm bolt with grade 8.8, Grade A, the marking is GB/T5783 M12X802. The length can be chosen according to design requirements and the standard preferred length table.
Hexagon bolt sets are complete fasteners assembled in accordance with standards, consisting of bolts of grades 4.8/8.8/10.9/12.9, nuts of grades 4/6/8/10/12, flat washers and spring washers. They fall into three categories: external hexagon, internal hexagon and high-strength types, featuring high installation efficiency and reliable anti-loosening performance.
Coating: zinc, black oxide, HDG, dacromet ,ect
