S-91829A309 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Precise component alignment ensured by the smooth shoulder with tight diameter tolerance (-0.001" to 0") for reduced vibration and wear
• Reliable thread engagement with Class 2A UNC coarse threads providing consistent fastening and easy assembly
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Versatile drive options with combined socket and slotted head for flexible installation in confined spaces
• Stable shoulder support featuring precise length tolerance (0" to 0.002") for accurate positioning of rotating components
• Compliance with industrial safety standards including RoHS 3 and REACH for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw delivers exceptional engineering value in precision mechanical assemblies where component alignment and rotational stability are critical. The 18-8 stainless steel construction with passivated finish provides superior resistance to corrosion and chemical exposure, making it ideal for manufacturing equipment, automation systems, and industrial machinery operating in demanding conditions. The precisely machined shoulder diameter with tight tolerance control ensures minimal clearance between moving parts, reducing vibration and preventing premature wear in bearings, gears, and linkages. With its Class 2A thread fit and 70,000 psi tensile strength, this heavy-duty fastener maintains clamping force under significant loads while the combination socket/slotted drive offers installation flexibility in space-constrained applications.

Specification Summary & Compliance

This precision shoulder screw features 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent engagement. Critical dimensions include shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002" for precise component positioning. Manufactured from 18-8 stainless steel with passivated finish, the fastener delivers 70,000 psi tensile strength and Rockwell B55 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current industrial safety and environmental standards.