A hex head screw is a fastener with a hexagonal head. It requires a wrench or socket wrench for installation.
Classification by Head Structure:
External Hex Head Screws: The head is hexagonal, requiring a wrench or socket wrench for installation, such as M10-1.5 X 20. Low cost, suitable for general mechanical connections.
Internal Hex Head Screws: The head is concave hexagonal, requiring an internal hex wrench, such as M4-0.7 X 6. Can apply higher torque, used in tight spaces.
Classification by Thread Type:
Fully Threaded: The entire threaded section of the screw is threaded, such as 316 stainless steel fully threaded bolts. Suitable for applications requiring even force distribution, such as mechanical fastening.
Partially Threaded: Partially threaded section of the screw, suitable for applications requiring length adjustment or positioning.
Classification by Functional Design
Hole/Slotted Type: Head with holes or slots for anti-loosening or locking, such as small hexagonal head bolts with holes. Suitable for applications requiring anti-loosening or locking, such as bridges and transportation.
Flanged Type: Head with a flange face to increase the pressure-bearing area, such as hexagonal head flange bolts. Suitable for industrial equipment requiring high preload or anti-loosening performance.
Classification by Material
Carbon Steel/Stainless Steel: Such as A2-70 stainless steel hexagonal bolts. General purpose, such as in the construction industry. Corrosion resistant, such as in the automotive and marine industries.
High-Temperature Alloy: Such as GH1015 high-temperature resistant bolts, used in high-temperature environments such as chemical and power industries.