GB/T 898-1988 Double end studs b1=1.25d-type B is a high quality, high strength mechanical connection, widely used in a variety of occasions requiring high strength connection.
Type B stud is especially suitable for heavy loads and high-strength connections, and its 1.25d design parameters guarantee sufficient strength and stability during tightening.
In terms of materials, GB/T 898-1988 stud b1=1.25d(Type B) is usually made of carbon steel, grade 8.8, hardness range between HRC22 and 34, and the surface treatment is generally coated with colored zinc to increase its corrosion resistance and beauty.