S-97345A645 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• High-strength performance offering 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications.
• Precise Class 3A thread fit ensures reliable, vibration-resistant fastening and consistent assembly quality.
• Knurled hex socket head provides enhanced grip for easy installation and removal, even in tight spaces.
• Durable Rockwell B79 hardness maintains structural integrity under repeated stress and wear.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety.
• Accurate shoulder dimensions with controlled tolerances for precise alignment and smooth rotational movement in assemblies.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in high-performance industrial applications, such as machinery, automation systems, and precision instruments. The 1/4-20 UNC coarse thread and Class 3A fit provide exceptional resistance to loosening under vibration, while the knurled hex socket head allows for secure torque application in confined areas. Its corrosion-resistant material ensures longevity in moist or chemical-exposed environments, reducing maintenance needs. The precisely machined shoulder acts as a reliable pivot or spacer, facilitating accurate component alignment and minimizing wear. Ideal for shoulder mounting solutions requiring robust tensile and shear strength, this screw delivers consistent performance in demanding engineering contexts.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with a Class 3A fit for high precision, and shoulder dimensions including a diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 11/16" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and reliability in industrial use.