S-97832A278 1/4"-20 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 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
- Precise alignment and smooth rotation ensured by the 3/8" diameter shoulder with tight tolerance control
- Secure, non-slip fastening thanks to the knurled socket head design and Class 3A thread fit
- Easy installation and removal with standard hex drive and right-hand UNC coarse threads
- Long-term reliability backed by Rockwell B55 hardness and compliance with ASME B18.3 standards
- Environmentally responsible manufacturing with full RoHS 3 and REACH compliance
Professional Applications & Engineering Value
This 1/4"-20 shoulder screw is engineered to solve critical alignment and rotational challenges in precision machinery, automated assembly systems, and heavy-duty industrial equipment. The 18-8 Stainless Steel material provides excellent corrosion resistance, reducing maintenance in humid or chemically aggressive environments. Its 3/8" shoulder diameter with controlled tolerances ensures precise component positioning, preventing misalignment and wear in rotating assemblies. The knurled socket head offers superior grip for high-torque applications, while the Class 3A UNC thread fit guarantees secure fastening under vibration and dynamic loads. Ideal for use in robotics, conveyor systems, and precision instruments, this shoulder screw delivers consistent performance where dimensional accuracy and durability are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A fit for high-precision applications, and a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002". The shoulder length is 3/4" with tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards.
