S-97345A493 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for long-lasting performance in harsh industrial environments
• Precise component alignment through Class 3A thread fit ensuring tight tolerances and reliable assembly
• Enhanced torque transmission with 5/16" shoulder diameter providing stable bearing surfaces for rotating components
• Secure installation and removal using hex socket drive design with knurled head for improved grip during handling
• High mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Fine thread engagement with 1/4"-28 UNF configuration offering superior vibration resistance and load distribution
• Regulatory compliance assurance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

Engineered for precision machinery and industrial equipment, these 316 stainless steel shoulder screws provide critical solutions for alignment-sensitive applications. The Class 3A thread fit ensures minimal backlash in assemblies where positional accuracy is paramount, while the fine UNF threads deliver superior resistance to vibrational loosening in dynamic systems. The knurled socket head design facilitates installation in confined spaces common in manufacturing equipment, robotics, and precision instruments. With exceptional corrosion resistance from 316 stainless steel, these shoulder screws maintain dimensional stability and mechanical integrity in challenging environments including chemical processing, marine applications, and food processing equipment where moisture and corrosive agents are present.

Specification Summary & Compliance

This precision shoulder screw features Class 3A thread fit with UNF fine thread specification (1/4"-28) and maintains tight shoulder diameter tolerance of -0.004" to -0.002". Manufactured in compliance with ASME B18.3 standards, the fastener demonstrates full conformance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The component achieves Rockwell B79 hardness and 70,000 psi tensile strength, ensuring reliable performance across industrial applications requiring precision alignment and durable fastening solutions.