S-90311A177 5/16"-18 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
- Vibration-resistant locking: Permanent nylon patch thread locker ensures secure fastening, preventing loosening under dynamic loads from -50° to 250°F.
- Superior corrosion resistance: 316 stainless steel construction offers excellent durability in harsh, corrosive industrial environments.
- High-strength performance: With 70,000 psi tensile strength and 35,000 psi shear strength, it reliably handles heavy-duty mechanical stresses.
- Precision alignment and pivoting: The 2" shoulder with standard fit provides accurate component location and smooth rotational movement.
- Easy installation and removal: Hex socket drive and knurled head allow for secure tool grip and efficient torque application.
- Reliable thread engagement: Class 3A thread fit with 5/16"-18 UNC coarse threads ensures consistent, high-quality connections.
- Compliant and safe: Meets ASME B18.3 specifications and is RoHS 3/REACH compliant for global regulatory acceptance.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to solve critical challenges in precision machinery, automation systems, and assembly jigs. The 2" shoulder length acts as a precise spacer or pivot, eliminating misalignment in rotating parts like conveyor rollers or robotic arms. Its nylon patch thread locker provides permanent resistance to vibration-induced loosening, essential in high-cycle equipment. The coarse UNC threads and Class 3A fit enable quick assembly with reliable clamping force, while the knurled socket head ensures tool access in confined spaces. Ideal for industrial applications demanding corrosion resistance and structural integrity, it reduces maintenance downtime and enhances operational safety.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precise tolerance, a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002", and shoulder length of 2" with tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and material quality.
