When your build demands strength, precision, and reach, these fasteners deliver without compromise. Made from hardened alloy steel, these grade 12.9 hex socket cap screws are designed for high-load applications where standard screws fall short. The extended length range makes them ideal for deep assemblies, structural fastening, and demanding mechanical work. Clean black finish, exact threading, and reliable torque performance make them a workshop essential.
Key Features
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Premium DIN912 hex socket cap screw design for professional-grade fastening
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Grade 12.9 alloy steel offers exceptional tensile strength and wear resistance
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Extra-long length options from 4mm up to 150mm
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Precision allen head screw bolt for secure torque and reduced cam-out
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Black finish for corrosion resistance and a clean industrial look
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Wide size range: M2, M2.5, M3, M3.5, M4, M5, M6, M8
Why Choose Our Grade 12.9 Cap Screws
Compared to lower-grade fasteners, these hex socket cap screws handle higher loads, vibration, and repeated tightening without deforming. The extended length options reduce the need for spacers or workarounds, giving you stronger, cleaner assemblies that last.
Perfect For
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Mechanical and industrial assemblies
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CNC machines, robotics, and automation
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Automotive and motorcycle components
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Engineering projects and professional workshops
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DIY builds requiring long, high-strength fasteners
Product Specs
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Material: High-strength alloy steel
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Grade: 12.9
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Standard: DIN912
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Head Type: Hex socket cap
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Drive Type: Allen / hex
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Length Range: 4–150mm
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Finish: Black
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Application: long allen screw fastening
Build Stronger from the Start
Choose fasteners that match the demands of serious work. Experience the strength, precision, and flexibility these grade 12.9 steel screws bring to every project—order the size and length you need today.
