S-90324A144 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Precise alignment and secure positioning thanks to the 2" shoulder length with tight manufacturing tolerances
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Reliable left-hand thread engagement with Class 3A fit ensuring vibration resistance and secure fastening
• Easy installation and removal with knurled socket head and 3/16" hex drive preventing tool slippage
• Enhanced durability with Rockwell B55 hardness providing excellent wear resistance
• Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance

Professional Applications & Engineering Value

This high-precision shoulder screw is engineered to solve critical alignment challenges in industrial machinery and equipment. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or outdoor elements. The 2" shoulder length with tight diameter and length tolerances ensures precise component positioning in assemblies requiring accurate shaft alignment or rotational guidance. The left-hand UNC coarse threads offer reliable fastening in applications where right-hand threads might loosen due to rotational forces, while the Class 3A thread fit guarantees consistent engagement and vibration resistance. The knurled socket head with hex drive enables secure tool engagement during installation, even in confined spaces or high-torque scenarios commonly encountered in manufacturing, automation, and heavy equipment applications.

Specification Summary & Compliance

This shoulder screw features 5/16"-18 UNC left-hand coarse threads with Class 3A fit for precision engagement. The shoulder maintains tight tolerances with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured from 18-8 stainless steel with Rockwell B55 hardness, the fastener delivers 70,000 psi tensile strength and 35,000 psi minimum shear strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets and restricted substance requirements.