S-91327A302 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Permanent vibration resistance with nylon patch thread locking that maintains secure fastening in temperatures from -50° to 250°F
- Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
- Precision thread engagement with Class 3A thread fit ensuring reliable, consistent assembly and reduced risk of cross-threading
- Easy installation and removal featuring a standard hex socket drive (5/32") and knurled head for improved grip during torque application
- Accurate component alignment through precisely machined shoulder with controlled diameter and length tolerances
- Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This 1/4"-20 UNC shoulder screw with nylon patch locking technology addresses critical industrial challenges where vibration loosening and misalignment compromise machinery reliability. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance for applications in manufacturing equipment, automotive assemblies, and outdoor machinery. The Class 3A thread fit ensures precise engagement in high-cycle production environments, while the integrated shoulder maintains accurate component positioning in rotating mechanisms and bearing mounts. Engineered to withstand extreme temperature fluctuations from -50° to 250°F, this socket head shoulder screw delivers reliable performance in precision instruments, conveyor systems, and industrial robotics where dimensional stability and vibration resistance are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit and UNC thread form (1/4"-20). Shoulder diameter tolerance: -0.004" to -0.002", shoulder length tolerance: -0.005" to 0.005". Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread locking system utilizes permanent nylon patch technology validated for industrial temperature ranges.
