S-91327A223 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant performance with permanent nylon patch thread locker that maintains integrity across -50° to 250°F temperature ranges
• Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Precision alignment capability with Class 3A thread fit ensuring exact mating with components and reduced assembly tolerance issues
• Enhanced installation control via knurled socket head design providing positive grip and torque transmission during tightening
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding load applications
• Reliable shoulder positioning with precise 3/4" shoulder length maintaining consistent component spacing and rotational stability
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global manufacturing and environmental requirements

Professional Applications & Engineering Value

Engineered for precision rotational and linear motion systems, this 1/2"-13 UNC shoulder screw solves critical alignment challenges in industrial machinery, automation equipment, and bearing assemblies. The 18-8 stainless steel construction combined with passivated finish provides exceptional corrosion resistance in manufacturing environments where chemical exposure or moisture is present. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms, preventing loosening under continuous vibration in power transmission systems and robotic actuators. With Class 3A thread fit precision and knurled socket head design, installers achieve accurate component positioning while maintaining torque control during assembly. The 3/4" shoulder length ensures precise axial spacing in pulley systems, gear assemblies, and rotating shafts, reducing wear and maintaining operational accuracy.

Specification Summary & Compliance

This shoulder screw features Class 3A thread fit with UNC coarse threading (1/2"-13) and maintains dimensional accuracy with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to industry standards for socket head shoulder screws with hex drive (1/4") compatibility. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.