DIN913/GB77 12.9 Grade Set Screw Hex Socket Headless Flat End Fastener M2.5-M16

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12.9 grade DIN913/GB77 hex socket set screws are high-strength headless fasteners engineered with a flat end, available in M2.5-M16 metric sizes. As precision industrial fasteners, they comply with both DIN913 and GB77 standards, delivering exceptional torque capacity and reliable fastening performance for machinery, equipment, and precision assemblies.

Crafted from 12.9 grade alloy steel, the screws offer superior hardness and wear resistance, making them ideal for heavy-duty applications that require strong, vibration-resistant connections. The headless design ensures a flush fit without protrusions, avoiding interference with moving parts or adjacent components—critical for mechanical and automotive installations.

The hex socket drive enables secure tool engagement and precise torque control, while the flat end provides stable load distribution and tight contact with workpieces, preventing slippage during operation. Suitable for engineers, manufacturers, and maintenance professionals, these set screws are widely used in securing gears, pulleys, shafts, and other rotating parts, where consistent fastening integrity is essential.

Core Features & Advantages

12.9 Grade High Strength: Superior hardness and wear resistance for heavy-duty industrial use.
Dual Standard Compliance: Meets DIN913 and GB77 standards for dimensional accuracy and reliability.
Headless Flat End Design: Flush fit, no protrusions, and stable load distribution for mechanical components.
Hex Socket Drive: Secure tool grip and precise torque control for seamless installation.
Broad Size Range: M2.5-M16 covers diverse small to large-duty fastening needs.

Key Specifications

Material: 12.9 Grade Alloy Steel
Standards: DIN913, GB77
Drive Type: Hex Socket
Design: Headless, Flat End Set Screw
Sizes: M2.5-M16
Applications: Machinery, Gears, Pulleys, Shafts, Automotive, Precision Assemblies
Performance: High-Torque, Wear-Resistant, Vibration-Resistant, Flush-Mount