S-97345A638 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 316 stainless steel construction, ideal for harsh industrial and marine environments.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance in demanding applications.
- Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder fit, reducing installation errors.
- Secure, non-slip installation thanks to the knurled socket head and 3/16" hex drive, providing excellent grip during tightening.
- Durable, long-lasting performance from Rockwell B79 hardness, resisting wear and deformation under stress.
- Wide compatibility with 1/4"-20 UNC coarse threads, suitable for various machinery and equipment requiring right-hand threading.
- Regulatory compliance and safety meeting ASME B18.3 standards, RoHS 3, and REACH for use in regulated industries.
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 Class 3A thread fit and coarse UNC threads ensure tight, reliable fastening with minimal risk of loosening under vibration, while the knurled socket head with a 3/16" hex drive allows for secure installation in confined spaces. Its high tensile strength (70,000 psi) and corrosion-resistant material make it ideal for applications in chemical processing, marine hardware, and food manufacturing, where durability and hygiene are paramount. By providing consistent shoulder dimensions and right-hand threading, this screw simplifies assembly, reduces maintenance downtime, and enhances overall system reliability in industrial shoulder screw applications.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with precise dimensions including a Class 3A thread fit for superior accuracy. Key tolerances include shoulder diameter (-0.004" to -0.002") and shoulder length (-0.005" to 0.005"), ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible use in global markets.
