S-91273A785 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Made from 18-8 stainless steel with a black oxide finish, this screw withstands harsh industrial environments, reducing replacement frequency and maintenance costs.
• High Tensile and Shear Strength: With a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi, it provides reliable performance in demanding, high-stress applications.
• Precision Shoulder for Accurate Alignment: The 16mm shoulder with a tight diameter tolerance ensures precise component location and smooth rotational movement in assemblies.
• Secure and Stripping-Resistant Drive: The knurled hex socket head and 2 mm hex drive offer superior grip and torque transmission, minimizing the risk of tool slippage and head damage.
• Reliable Thread Engagement: The Class 5g6g thread fit on the M4 x 0.7mm coarse thread provides consistent, secure fastening with excellent vibration resistance.
• Broad Industrial Compliance: Meets RoHS 3 and REACH regulations, ensuring safety and environmental standards for use in various global markets and sensitive applications.
• Optimized for Durability: A Rockwell B55 hardness rating ensures the screw maintains its form and function under repeated use and mechanical stress.

Professional Applications & Engineering Value

This M4 shoulder screw is engineered to solve critical alignment and durability challenges in industrial applications. The precision-machined 16mm shoulder acts as a dependable pivot or axle, ensuring components like gears, pulleys, and linkages are perfectly positioned without misalignment. Manufactured from 18-8 stainless steel and finished with a protective black oxide coating, it resists corrosion and wear in environments exposed to moisture, chemicals, and operational stress. The Class 5g6g thread fit and coarse 0.7mm pitch provide robust, vibration-resistant connections, while the knurled socket head allows for high-torque installation in confined spaces. This combination of high tensile strength and precise dimensional control makes it an ideal precision shoulder bolt for machinery, automotive assemblies, and electronic enclosures where reliability is non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to metric system specifications with an M4 thread size, 0.7mm coarse pitch, and a Class 5g6g thread fit ensuring precise ISO-compliant tolerances. The shoulder diameter tolerance is -0.04 to -0.01 mm, and the shoulder length tolerance is 0 to 0.25 mm for accurate assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free from hazardous substances and suitable for regulated industrial use.