S-90833A128 M8 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides reliable protection against rust and wear in demanding industrial environments.
• High Tensile Strength for Demanding Applications: Alloy steel construction with 140,000 psi tensile strength ensures secure, long-lasting fastening under high stress.
• Precision Alignment & Reduced Wear: 12mm shoulder length with standard fit offers accurate component positioning, minimizing misalignment and part wear.
• Secure & Easy Installation: Knurled, low-profile hex socket head with 5mm drive allows for firm tool grip and efficient tightening in confined spaces.
• Reliable Thread Performance: M8x1.25 coarse right-hand thread with Class 5g6g fit ensures easy assembly and consistent clamping force.
• Compliance with Global Standards: Meets RoHS 3 and REACH regulations, making it suitable for international markets and environmentally conscious operations.
• Optimized for Industrial Use: Rockwell C30 hardness and precise shoulder diameter tolerance (-0.072 to -0.01 mm) deliver consistent performance in machinery and assemblies.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical challenges in precision assemblies, such as aligning moving parts in machinery, reducing rotational friction, and preventing loosening under vibration. The alloy steel core, combined with a black oxide finish, resists corrosion and maintains integrity in harsh conditions, from manufacturing equipment to automotive systems. The low-profile hex socket head with knurling ensures secure tool engagement, speeding up installation while minimizing head protrusion. With a coarse thread pitch of 1.25mm and Class 5g6g thread fit, it offers quick assembly and reliable holding power, ideal for applications requiring repeated adjustments or high load-bearing capacity. This metric shoulder screw serves as a dependable fastener in robotics, conveyor systems, and precision instruments, where exact shoulder dimensions and material strength are crucial for operational safety and efficiency.

Specification Summary & Compliance

This shoulder screw adheres to metric thread standards with M8x1.25 coarse threads and Class 5g6g thread fit for precise tolerance. Key dimensional specs include a shoulder diameter tolerance of -0.072 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm, ensuring consistent fit in assemblies. Manufactured from alloy steel with Rockwell C30 hardness and 140,000 psi tensile strength, it meets rigorous performance criteria. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally regulated and industrial applications worldwide.