S-97832A288 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance provided by 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, designed to withstand significant mechanical loads without failure.
• Precise alignment and secure positioning enabled by the 3/8" shoulder diameter with tight manufacturing tolerances, reducing assembly errors.
• Superior grip and easy installation from the knurled socket head and hex drive, allowing for efficient torque application and reduced tool slippage.
• Reliable thread engagement with Class 3A thread fit and 1/4"-20 UNC coarse thread, ensuring secure fastening in demanding applications.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing product quality and environmental safety.
• Durable material hardness rated at Rockwell B55, providing excellent wear resistance and extended service life.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 18-8 stainless steel material offers superior corrosion resistance, making it ideal for environments exposed to moisture, chemicals, or extreme temperatures. The 3/8" shoulder diameter with precise tolerances ensures accurate component positioning, reducing vibration and misalignment in assemblies. Combined with the 1/4"-20 UNC coarse thread and Class 3A thread fit, it provides reliable fastening in high-stress applications such as rotating shafts, pivots, and bearing supports. The knurled socket head enhances grip during installation, improving efficiency and safety in maintenance operations. This design delivers consistent performance, minimizing downtime and maintenance costs in industrial applications.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision and reliable engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 2" with a tolerance of -0.005" to 0.005", ensuring exact dimensional accuracy. It is manufactured in compliance with ASME B18.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.