Metric Sizes 12.9 ISO 7379 Shoulder Socket Head Cap Screw with Black Oxide Plating
Metric ISO 7379 Shoulder Socket Head Cap Screws
Class 12.9 Black Oxide Precision Fasteners
Metric ISO 7379 shoulder socket head cap screws, Class 12.9 with black oxide plating, are high-strength precision fasteners designed for applications requiring exact alignment, controlled motion, and superior load-bearing performance. Manufactured to ISO 7379 dimensional standards, these metric shoulder screws provide consistent interchangeability and reliable performance in demanding mechanical assemblies.
Class 12.9 Alloy Steel Strength
Engineered for High Load and Wear Resistance
Produced from high-grade alloy steel and heat treated to property class 12.9, these shoulder screws offer exceptional tensile strength, hardness, and fatigue resistance. The unthreaded shoulder is precision-ground to tight tolerances, allowing it to function as a bearing surface, axle, spacer, or pivot point. This design ensures that shear loads are carried by the shoulder rather than the threads, extending fastener life and protecting mating components.
Black Oxide Plating Benefits
Dimensional Accuracy and Professional Finish
Black oxide plating is a controlled chemical conversion coating that enhances surface durability without altering critical dimensions. This makes it ideal for shoulder screws, where precise shoulder diameter and length are essential. The finish reduces friction, improves wear resistance, and minimizes glare, while providing mild corrosion protection when used with proper lubrication or oiling.
Functional Design Advantages
Precision Alignment and Controlled Motion
The socket head design allows for high-torque installation using a hex key, making these fasteners suitable for compact assemblies with limited clearance. Metric ISO 7379 shoulder socket head cap screws are commonly used where smooth rotation, accurate spacing, or guided movement is required, delivering repeatable performance in dynamic applications.
Applications and Industries
Trusted Across Precision Manufacturing
Metric Class 12.9 shoulder screws with black oxide finish are widely used in automation equipment, industrial machinery, tooling and fixtures, robotics, automotive systems, and manufacturing assemblies. Available in a wide range of metric shoulder diameters, shoulder lengths, and thread sizes, these fasteners provide engineers and maintenance professionals with a reliable solution for high-precision, high-strength fastening requirements.
When strength, accuracy, and durability are critical, ISO 7379 black oxide shoulder socket head cap screws deliver dependable, professional-grade performance.