S-90311A184 3/8"-16 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
- High-strength performance offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Secure vibration-resistant locking provided by the nylon patch, maintaining fastener integrity from -50° to 250° F without loosening.
- Precise Class 3A thread fit ensures consistent engagement and reduces the risk of cross-threading during assembly.
- Easy installation and removal with a standard hex socket drive and knurled head for improved grip and torque application.
- Accurate shoulder positioning with controlled diameter and length tolerances for stable component alignment.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNC coarse thread and Class 3A fit provide rapid assembly with high repeatability, minimizing production downtime. The integral shoulder acts as a precise pivot or spacer, reducing wear on moving parts, while the nylon patch thread locker secures the joint against vibrations and thermal cycling. Its hex socket head with knurling allows for efficient torque transfer in confined spaces, making it a reliable choice for industrial shoulder bolt applications requiring durability, corrosion resistance, and consistent performance under stress.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit per UNC standards, with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precise dimensional control. Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free of restricted substances and safe for use in regulated industries.
