S-91274A111 M3 x 25 mm ASTM B117, DIN 912, ISO 4762 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Class 12.9 rating and 170,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc-flake coating, extending service life in harsh industrial environments.
• High hardness for wear resistance with Rockwell C37 hardness, maintaining thread integrity and drive features through repeated use.
• Precise hex socket drive engagement using a 2.5 mm hex key, allowing for high torque application and reducing the risk of stripping.
• Optimized partial threading (18 mm thread length on a 25 mm screw) for secure fastening in tapped holes while minimizing thread damage.
• International standard compliance with ISO 4762 and DIN 912, ensuring interchangeability and reliability in global engineering projects.
• Environmental regulation adherence with RoHS 3 and REACH compliance, making them suitable for regulated industries and sustainable procurement.

Professional Applications & Engineering Value

This M3 socket head cap screw is engineered to solve critical fastening challenges in high-vibration and heavy-load environments. The zinc-flake-coated alloy steel construction provides an exceptional barrier against rust and chemical exposure, significantly outperforming standard plating in automotive, machinery, and outdoor equipment applications. Its Class 12.9 strength class and precise metric coarse thread (M3 x 0.5 mm) ensure that the screw maintains clamp load under dynamic stresses, preventing joint failure. The partially threaded design allows the unthreaded shank to act as a precision pilot, reducing cross-threading in CNC machined components and aluminum assemblies. By combining high tensile strength with superior corrosion protection, this fastener delivers long-term reliability in demanding industrial settings, from production jigs to robotic arms.

Specification Summary & Compliance

This socket head cap screw features an M3 x 0.5 mm metric coarse thread with a Class 5g6g thread fit for precise engagement and consistent clamping force. Manufacturing and quality adhere to ISO 4762 and DIN 912 dimensional standards, while corrosion resistance is validated per ASTM B117 testing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets current environmental and safety requirements for industrial components.