S-90324A140 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and reducing replacement frequency.
• Precise alignment and smooth rotation ensured by the 1 1/2" shoulder with standard fit, minimizing component wear.
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, providing reliable fastening under heavy loads.
• Secure, non-slip installation thanks to the knurled socket head and 3/16" hex drive, allowing for high torque application.
• Reliable left-hand threading with Class 3A fit for applications requiring reverse rotation security and vibration resistance.
• Compliance with strict environmental regulations, being RoHS 3 and REACH compliant for safe, global industrial use.
• Coarse UNC thread for quicker assembly and disassembly, enhancing maintenance efficiency.

Professional Applications & Engineering Value

This left-hand thread shoulder screw is engineered to address critical challenges in machinery and assembly lines where reverse-thread security is paramount. The 18-8 stainless steel material offers superior corrosion resistance, extending service life in moist or chemically aggressive settings. The 1 1/2" shoulder length provides a stable bearing surface, preventing axial movement and ensuring precise component alignment in rotating assemblies like pulleys, gears, and linkages. Combined with a Class 3A thread fit and knurled socket head, it delivers vibration-resistant fastening and easy installation with standard hex tools, reducing downtime in industrial fastener applications. Ideal for heavy-duty machinery, automation systems, and equipment requiring left-hand threading for safety, this screw enhances operational reliability and durability.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Dimensions include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/2" (tolerance: -0.005" to 0.005"), ensuring consistent performance. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industries.