S-97345A588 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 chemical exposure
• Precise component alignment ensured by Class 3A thread fit and standard shoulder fit for reduced assembly play
• High mechanical reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Secure installation and removal facilitated by hex socket drive and knurled head for enhanced grip
• Optimized for rapid assembly using coarse UNC threads that resist loosening under vibration
• Consistent dimensional accuracy maintained through ASME B18.3 compliance and tight shoulder tolerances
• Environmental and regulatory safety with full RoHS 3 and REACH compliance for global industrial use

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw delivers critical performance in precision assemblies where alignment, corrosion resistance, and mechanical strength are paramount. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments like robotics, conveyor systems, and packaging machinery. The knurled socket head allows for tool-friendly installation while the precisely machined shoulder provides reliable locating and pivoting functions in jigs, fixtures, and rotating mechanisms. Manufactured to ASME B18.3 specifications, it eliminates play and misalignment, reducing wear and maintenance costs in industrial fastener applications.

Specification Summary & Compliance

Thread specifications: 1/4"-20 UNC with Class 3A tolerance. Shoulder diameter: 5/16" with tolerance of -0.004" to -0.002". Shoulder length: 1 1/4" with tolerance of -0.005" to 0.005". Material hardness: Rockwell B79. Compliant with ASME B18.3 standard. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.