S-90298A825 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing maintenance costs.
• Exceptional load-bearing capacity with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for reliable performance under high stress.
• Precise alignment and reduced wear thanks to the 7" shoulder with controlled diameter tolerance, ensuring smooth operation in pulley and pivot applications.
• Secure, non-slip installation provided by the knurled socket head and 5/16" hex drive, allowing for high torque application without tool slippage.
• Guaranteed thread reliability with Class 3A fit and 1/2"-13 UNC coarse thread, offering excellent resistance to vibration loosening.
• Enhanced durability and hardness at Rockwell B55, providing long service life and resistance to deformation in demanding applications.
• Broad regulatory compliance including ASME B18.3, RoHS, and REACH, ensuring product safety and suitability for global markets.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load challenges in industrial machinery. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for environments exposed to moisture or chemicals. The long, precision-machined 7" shoulder acts as a sturdy axle or pivot point, reducing bushing wear and maintaining exact component positioning in assemblies like conveyor systems, robotic arms, and printing equipment. The coarse UNC thread and Class 3A fit ensure a secure, vibration-resistant fastening, while the knurled socket head allows for high-torque installation with standard hex keys, streamlining maintenance and assembly processes.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with a Class 3A fit for precise thread engagement. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 7" with a tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.