S-90311A165 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments.
- Vibration-resistant secure locking provided by the nylon patch thread locker, maintaining clamp load from -50°F to 250°F.
- High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
- Precise alignment and smooth rotation enabled by the standard shoulder with controlled diameter and length tolerances.
- Easy installation and removal using the 5/32" hex socket drive and knurled head for improved grip.
- Reliable thread engagement with Class 3A fit and 1/4"-20 UNC coarse thread for quick assembly and high fatigue resistance.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety.
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 nylon patch thread locker effectively prevents loosening under vibration and thermal cycling, ensuring long-term joint integrity in dynamic environments. Its 1/4"-20 UNC coarse thread with Class 3A fit provides excellent fatigue resistance and rapid installation, while the precisely machined shoulder acts as a pivot, bearing surface, or locator, eliminating the need for separate spacers. The knurled socket head enhances tool grip, reducing slippage during torque application. Ideal for industrial applications requiring corrosion resistance, dimensional stability, and reliable locking, this component delivers consistent performance in robotics, conveyor systems, and electronic enclosures.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and a shoulder diameter tolerance of -0.004" to -0.002". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both precision and regulatory adherence for global industrial use.
