S-92981A789 M5 ASTM A108 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability – Alloy steel construction with Rockwell C32 hardness ensures long-lasting performance in demanding industrial environments.
• Superior Corrosion Resistance – Black oxide finish provides reliable protection against rust and wear, extending service life.
• Precise Alignment & Stability – 25mm shoulder length with tight tolerance (±0.25mm) enables accurate component positioning and reduces vibration.
• High Load Capacity – Tensile strength of 140,000 psi supports heavy-duty applications without failure.
• Easy Installation & Removal – Hex socket drive (3mm) and knurled head offer secure grip and efficient tool engagement.
• Reliable Thread Performance – Class 5g6g thread fit with coarse M5x0.8 metric threading ensures consistent fastening and resistance to loosening.
• Broad Industry Compliance – Meets ASTM A108, RoHS 3, and REACH standards for safe, regulated use in global markets.

Professional Applications & Engineering Value

This M5 shoulder screw is engineered to address critical alignment and wear challenges in precision machinery, automation systems, and assembly jigs. The alloy steel core, combined with a black oxide finish, resists corrosion and mechanical stress, making it ideal for environments exposed to oils, moisture, or high cyclic loads. The 25mm shoulder length with minimal tolerance variation provides a stable bearing surface, preventing lateral movement and reducing bushing wear in rotating assemblies. With its coarse metric thread and hex socket drive, it ensures quick, secure fastening in tight spaces, streamlining maintenance and reducing downtime in industrial applications.

Specification Summary & Compliance

This shoulder screw features precise dimensional control, including a shoulder diameter tolerance of -0.072 to -0.01 mm and length tolerance of 0 to 0.25 mm. Threads conform to Class 5g6g fit under metric standards, ensuring reliable engagement. Manufacturing adheres to ASTM A108 specifications, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety.