S-97832A275 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing in demanding applications.
• Precise alignment and positioning ensured by the 3/8" shoulder diameter with tight tolerances, minimizing part movement and assembly errors.
• Secure and easy installation with a knurled hex socket head and 3/16" drive, providing excellent grip and reducing tool slippage.
• Consistent thread engagement due to Class 3A fit and 1/4"-20 UNC coarse threads, ensuring vibration resistance and long-term fastening integrity.
• Durability and hardness with Rockwell B55 rating, resisting wear and deformation under repeated use.
• Regulatory compliance and reliability meeting ASME B18.3, RoHS 3, and REACH standards for safe, industrial-grade use worldwide.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and strength requirements in precision machinery, automation systems, and heavy-duty equipment. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for environments exposed to moisture, chemicals, or outdoor conditions, thereby extending service life and reducing downtime. The Class 3A thread fit and coarse UNC threads ensure secure fastening in high-vibration settings, such as in robotics, conveyor systems, and automotive assemblies. The knurled socket head with hex drive allows for efficient installation in confined spaces, while the precisely machined shoulder acts as a pivot or spacer, eliminating the need for additional components. This design minimizes assembly time, enhances structural stability, and supports consistent performance in industrial applications where reliability is paramount.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision and a thread length of 3/4". The shoulder diameter is 3/8" with tolerances of -0.004" to -0.002", and shoulder length is 1/2" with tolerances of -0.005" to 0.005", ensuring exact dimensional accuracy. It complies with ASME B18.3 manufacturing standards and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.