S-92981A776 M2 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Superior Alignment and Precision: Class 5g6g thread fit ensures tight tolerances for accurate positioning in assemblies, reducing misalignment and improving product reliability.
• High Tensile Strength and Durability: Alloy steel construction with 140,000 psi tensile strength and Rockwell C32 hardness provides exceptional resistance to wear and mechanical stress in demanding applications.
• Corrosion Resistance and Longevity: Black oxide finish offers enhanced protection against rust and oxidation, extending the screw's service life in harsh industrial environments.
• Secure and Easy Installation: Hex socket drive (1.5 mm) and knurled head design allow for firm grip and straightforward torque application, minimizing slippage and installation time.
• Consistent Shoulder Performance: Precise shoulder diameter (3 mm) and length (30 mm) with standard fit ensure stable support and smooth rotation in pivoting or spacing components.
• Broad Compatibility and Compliance: Meets ASTM A108 specifications and is RoHS 3 and REACH compliant, ensuring safe use in various industrial sectors without regulatory concerns.
• Optimized for High-Stress Applications: Coarse pitch (0.4 mm) metric threading and right-hand thread direction provide strong holding power and quick assembly in vibration-prone settings.

Professional Applications & Engineering Value

This M2 shoulder screw is engineered to address critical challenges in precision machinery, such as maintaining alignment in rotating assemblies and reducing wear in high-load interfaces. The alloy steel material and black oxide finish combine to deliver robust corrosion resistance and durability, ideal for environments exposed to moisture or chemicals. With a Class 5g6g thread fit and coarse 0.4mm pitch, it ensures secure fastening in applications like automotive controls, electronic enclosures, and industrial robots, where vibration resistance and repeatable positioning are essential. The knurled socket head and hex drive facilitate easy installation in tight spaces, enhancing efficiency while the precise shoulder dimensions support accurate bearing or bushing mounting, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional tolerances, including a shoulder diameter tolerance of -0.072 to -0.01 mm and length tolerance of 0 to 0.25 mm, with a Class 5g6g thread fit per metric standards for consistent performance. It conforms to ASTM A108 manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.