DIN913/GB77 M4-M12 Set Screw 12.9 Grade Fine Thread Flat End Headless Hex Socket Screw

12.9 Grade DIN913/GB77 set screws are high-strength industrial fasteners engineered as headless hex socket screws with fine threads and a flat end. Covering sizes M4 to M12, these precision tightening screws are designed for secure, concealed fastening in machinery, equipment, and mechanical assemblies, delivering exceptional holding power and stability.

Crafted to 12.9 high-strength standards, they boast superior hardness and tensile strength, ensuring reliable tightening even under heavy loads and vibration. The fine thread design provides precise adjustment and enhanced clamping force, while the flat end enables tight contact with workpieces, preventing slippage and ensuring consistent performance.

Compliant with both DIN913 and GB77 standards, these headless set screws guarantee consistent dimensional accuracy and compatibility with standard hex socket tools. Their headless design allows for concealed installation, avoiding protrusions that could interfere with surrounding components. Ideal for precision machinery, automotive parts, tooling, and industrial fixtures requiring secure, low-profile fastening.

Core Features & Advantages

12.9 High-Strength Grade: Outstanding hardness and tensile strength for heavy-load industrial applications.
Dual Standard Compliance: DIN913 & GB77 compatibility, ensuring universal reliability and tool 适配.
Fine Thread & Flat End: Precise adjustment, strong clamping force, and stable workpiece contact.
Headless Hex Socket Design: Concealed installation, no protrusions, and easy operation with standard tools.
M4-M12 Size Range: Covers medium to large precision fastening needs for machinery and fixtures.

Key Specifications

Grade: 12.9 High-Strength
Standards: DIN913, GB77
Drive Type: Hex Socket
Design: Headless, Fine Thread, Flat End, Set Screw
Sizes: M4 - M12 (M4, M6, M7, M8, M10, M12)
Applications: Precision Machinery, Automotive Parts, Industrial Fixtures, Tooling, Mechanical Assemblies
Performance: High Hardness, Strong Clamping Force, Anti-Slip, Concealed Fastening