S-8077A634 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 environments and chemical exposure.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Precision Class 3A thread fit ensures tight, secure fastening with minimal backlash and improved assembly accuracy.
- Enhanced durability and wear resistance from the black oxide finish, which also reduces galling and provides a sleek, low-glare appearance.
- Easy installation and removal with a hex socket drive and knurled head for improved grip and torque application.
- Accurate shoulder dimensions with tight tolerances for consistent alignment and spacing in assemblies.
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial settings, such as corrosion from moisture, chemicals, and saltwater environments. The black oxide finish not only enhances corrosion protection but also reduces friction during installation, preventing seizing. With a 1/4"-20 UNC coarse thread and Class 3A fit, it provides reliable, vibration-resistant connections in machinery, automotive, and aerospace components. The precision-machined shoulder ensures accurate pivot points and alignment in rotating assemblies, reducing wear and maintenance costs. Ideal for applications requiring high tensile strength and long-term reliability, this screw supports efficient production and reduces downtime.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise threading. Dimensions include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 9/32" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe and sustainable use.
