S-91273A787 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 18-8 stainless steel with a black oxide finish, this screw offers superior protection against rust and wear in harsh industrial environments.
• High Tensile and Shear Strength: With a tensile strength of 70,000 psi and minimum shear strength of 35,000 psi, it ensures reliable performance under heavy mechanical loads.
• Precision Shoulder for Accurate Alignment: The 25mm shoulder with tight diameter tolerance provides stable, concentric positioning for components like gears and pulleys, reducing vibration and misalignment.
• Secure and Easy Installation: The knurled socket head with a 2 mm hex drive allows for firm grip and efficient torque application, minimizing slippage during assembly.
• Durable Thread Design: Class 5g6g thread fit with a coarse 0.7mm pitch ensures quick, secure fastening and resistance to loosening in high-vibration applications.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, making it safe for use in various industries without harmful substances.
• Versatile Industrial Use: Ideal for machinery, automotive, and electronics where precision, strength, and corrosion resistance are critical for long-term operation.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to address common industrial challenges such as component misalignment and corrosion-induced failure. Made from 18-8 stainless steel and coated with a black oxide finish, it provides excellent resistance to moisture and chemicals, extending service life in demanding settings like assembly lines or outdoor equipment. The 25mm shoulder length and precise diameter tolerance ensure accurate alignment in rotating parts, reducing wear and maintenance costs. With a hex drive and knurled head, it allows for easy installation in tight spaces, while the coarse thread and high tensile strength prevent stripping under stress. Ideal for precision engineering applications, this screw enhances reliability in machinery, robotics, and automotive systems where durability and compliance with standards like RoHS are essential.

Specification Summary & Compliance

This shoulder screw adheres to metric system standards with an M4 x 0.7mm coarse thread and Class 5g6g thread fit for precise engagement. Shoulder dimensions include a diameter of 4 mm with a tolerance of -0.04 to -0.01 mm and a length of 25 mm with a tolerance of 0 to 0.25 mm, ensuring consistent performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.