S-94361A551 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in demanding industrial environments.
• High Strength & Durability: Alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength ensures reliable performance under high stress.
• Precision Shoulder Fit: 40mm shoulder length with tight tolerance (0 to 0.25 mm) and 10mm diameter for accurate alignment and reduced assembly play.
• Secure & Easy Installation: Hex socket drive (5mm) and knurled head offer excellent grip and torque transmission, minimizing slippage.
• Consistent Thread Performance: Class 5g6g thread fit with M8x1.25 coarse right-hand threads ensures smooth engagement and vibration resistance.
• Broad Industrial Compliance: Meets RoHS 3 and REACH regulations, making it suitable for global manufacturing and engineering applications.
• Versatile Metric Design: Standard metric thread (M8) and socket head profile enable compatibility with a wide range of machinery and components.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The alloy steel core, enhanced by a black oxide finish, combats corrosion and extends service life in harsh conditions like automotive, robotics, and machinery. The 40mm shoulder length with minimal tolerance provides a stable bearing surface, reducing wear on mating parts and ensuring precise rotational or linear motion. Combined with a Class 5g6g thread fit and coarse M8x1.25 threads, it offers quick assembly and reliable holding power, minimizing loosening from vibrations. Ideal for jigs, pivots, and gear assemblies, this screw delivers consistent performance where exact positioning and high tensile strength are paramount.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M8x1.25 coarse thread and Class 5g6g thread fit for precise engagement. The shoulder diameter is 10 mm with a tolerance of -0.072 to -0.01 mm, and shoulder length is 40 mm with a 0 to 0.25 mm tolerance. It is manufactured from alloy steel with a black oxide finish, Rockwell C32 hardness, and 140,000 psi tensile strength. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(a) and REACH (EC 1907/2006) compliant, ensuring it meets environmental and safety regulations for industrial use.