S-90324A156 3/8"-16 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Precise alignment and smooth rotation ensured by the standard shoulder fit with controlled diameter and length tolerances.
• Enhanced torque application and grip from the knurled socket head and 1/4" hex drive, reducing tool slippage.
• Reliable left-hand threading with Class 3A fit and UNC coarse thread for secure fastening in specialized assemblies.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe and sustainable use.
• Durable performance backed by Rockwell B55 hardness, maintaining integrity under repeated stress.

Professional Applications & Engineering Value

This left-hand thread shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and rotating assemblies where reverse threading prevents loosening from rotational forces. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for food processing, marine, and chemical exposure applications. The knurled socket head with a 1/4" hex drive ensures maximum torque transmission and easy installation in confined spaces. Its Class 3A thread fit and precisely machined shoulder (1/2" diameter, 3/4" length) guarantee accurate component alignment and reduced wear, offering long-term reliability in high-vibration environments. This screw is a trusted solution for OEMs and maintenance teams seeking durable, compliant fasteners for industrial equipment.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of 1/2" (-0.004" to -0.002") and shoulder length of 3/4" (-0.005" to 0.005"). It is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for global industrial use.