S-91273A776 M3 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability and Corrosion Resistance: Crafted from 18-8 Stainless Steel with a Black Oxide finish, this screw offers superior protection against rust and wear in demanding industrial environments.
• Precise Shoulder Positioning: The 12mm shoulder length with a controlled tolerance ensures accurate component alignment and spacing, reducing assembly errors.
• High Mechanical Strength: With a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi, it provides reliable performance under high-stress conditions.
• Secure and Easy Installation: The knurled socket head with a 2 mm hex drive allows for a firm grip and prevents tool slippage, speeding up assembly.
• Consistent Thread Engagement: The M3x0.5 coarse thread with Class 5g6g fit ensures tight, reliable fastening and reduces the risk of cross-threading.
• Broad Regulatory Compliance: Meets RoHS 3 and REACH standards, making it suitable for global markets and environmentally conscious applications.
• Optimized Hardness for Longevity: A Rockwell B55 hardness rating ensures the screw maintains its form and function, resisting deformation over time.

Professional Applications & Engineering Value

This M3 shoulder screw is engineered to address critical challenges in precision assembly, such as maintaining exact part alignment and resisting mechanical fatigue. The 18-8 Stainless Steel construction, combined with a Black Oxide finish, provides excellent corrosion resistance, ideal for applications in machinery, automotive, and electronics where exposure to moisture or chemicals is common. The 12mm shoulder length acts as a precise spacer or pivot, eliminating the need for additional components and reducing overall assembly complexity. With a Class 5g6g thread fit and coarse thread pitch, it ensures quick and secure fastening in high-vibration environments, minimizing loosening. This makes it a reliable choice for industrial shoulder screw uses in jigs, fixtures, and rotating assemblies, where durability and dimensional accuracy are paramount.

Specification Summary & Compliance

This metric shoulder screw features precise dimensions, including a shoulder diameter of 3 mm with a tolerance of -0.04 to -0.01 mm and a shoulder length of 12 mm with a tolerance of 0 to 0.25 mm. The threads adhere to Class 5g6g fit standards for metric coarse threads, ensuring consistent performance. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for restricted substance-sensitive applications.