Semi-circular cup head bolts have a cylindrical body and rounded end with a threaded top. These bolts are characterized by providing good grip when tightening and are suitable for use in areas where space is limited or difficult to reach due to their low profile head design.

Material: including carbon steel, alloy steel, stainless steel (such as 304, 316, 316L, etc.) and other materials, the specific selection depends on the working environment and application requirements.

Grade: The product grade is divided into A grade and B grade, as well as different mechanical properties grade (such as 4.8 grade, 8.8 grade, 10.9 grade,A2-70, etc.), these grades reflect the tensile strength, yield strength and other mechanical properties of the bolt. Different grades are suitable for different load bearing requirements and working environments.

Advantage:

The low profile head design allows the bolt to be used in applications where fastener space is limited. A bulge or fin under the cupped head prevents the bolt from turning in materials such as wood, providing additional holding power. Rounded design helps provide better grip on smooth surfaces. Easy to install and remove when used with a hex wrench. Due to their design, additional washers are usually not required, thus reducing costs.

Scope of 

application

Used for joining timber, especially where bolt heads need to be hidden or are difficult to reach in timber. For automotive repair and maintenance work, especially where a low profile head design is required. For maintenance of industrial machinery where a strong fastening force is required in a compact space.