S-97768A319 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 18-8 stainless steel and black oxide finish for extended service life in harsh environments
- Precise component alignment ensured by the knurled head and Class 3A thread fit, reducing assembly errors
- High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Easy installation and removal with hex socket drive and standard UNC coarse threads requiring minimal torque
- Dimensional stability from Rockwell B55 hardness and tight shoulder tolerances for consistent performance
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use
- Versatile shoulder design providing reliable bearing surfaces for rotating parts and precision mechanisms
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw with black oxide finish addresses critical challenges in precision assembly and motion control systems. The 1/4"-20 UNC coarse thread and Class 3A thread fit ensure secure fastening with minimal cross-threading risk, while the knurled socket head provides superior grip during installation. Engineers specify these shoulder screws for applications requiring exact component spacing and rotational stability, such as in conveyor systems, robotic arms, and precision machinery. The combination of 70,000 psi tensile strength and corrosion-resistant properties makes it ideal for industrial environments where both mechanical stress and environmental factors are concerns, eliminating premature fastener failure and reducing maintenance intervals.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision. Features include 1/4"-20 UNC coarse threads, 7/16" thread length, and shoulder diameter tolerance of -0.004" to -0.002". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries worldwide.
