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What are Fine Thread Socket Head Cap Screws DIN 912 / ISO 12474?
Fine thread socket head cap screws are metric fasteners featuring a cylindrical head and an internal hex drive, also known as an Allen drive. They are designed for installation with a matching hex key or Allen bit and are commonly used in tapped holes where a strong, compact fastening solution is required. Compared with standard coarse-thread socket head cap screws, fine-thread versions have a smaller thread pitch, providing more threads per unit of length for applications requiring a specific fine-thread specification.
DIN 912 is the legacy German standard for socket head cap screws, while ISO 12474 covers metric fine-pitch hexagon socket head cap screws. These designations are useful when sourcing specialized fine-thread fasteners for machinery, equipment, and precision mechanical assemblies.
What material and finish are Fine Thread Socket Head Cap Screws made from?
These fine-thread socket head cap screws are manufactured from Class 12.9 high-strength steel with a black oxide finish. Class 12.9 steel provides high tensile strength and hardness for demanding mechanical fastening applications. Black oxide is a surface treatment that creates a dark, low-reflectivity appearance and offers limited corrosion protection. It is commonly selected for machinery, tooling, and mechanical assemblies where a black finish is desirable and enhanced corrosion resistance is not the primary requirement.
Why choose Class 12.9 Black Oxide Fine Thread Socket Head Cap Screws?
Class 12.9 black oxide fine-thread socket head cap screws are ideal for applications requiring high-strength fastening with a specific fine-thread pitch. Fine threads differ from standard coarse threads and may be necessary for specialized equipment, existing threaded holes, or assemblies designed around a particular thread specification. The internal hex drive supports installation in confined spaces, while the high-strength steel construction makes these fasteners suitable for demanding mechanical applications. The black oxide finish provides a traditional dark appearance often preferred for tooling and industrial equipment.
Where are Black Oxide Fine Thread Socket Head Cap Screws commonly used?
Black oxide fine-thread socket head cap screws are commonly used in precision machinery, machine tools, automation systems, robotics, fixtures, jigs, instrumentation, industrial equipment, and specialized mechanical assemblies. They are also useful in OEM manufacturing, maintenance, and repair applications where a particular fine-thread specification is required. Their combination of Class 12.9 steel, compact socket head design, and fine metric thread makes them a valuable option for engineers, machinists, and manufacturers sourcing specialized fasteners. The black oxide finish is especially suitable for tooling and equipment where a dark, low-reflectivity appearance is preferred.
