S-8077A629 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 and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, heavy-duty performance.
- Precise Class 3A thread fit ensures tight tolerances and secure fastening in demanding applications.
- Knurled socket head with hex drive provides enhanced grip and easy installation, reducing assembly time.
- Compliance with ASME B18.3 standards guarantees consistent quality and interchangeability in engineering assemblies.
- RoHS 3 and REACH compliant for safe use in regulated industries without hazardous substances.
- Durable Rockwell B79 hardness ensures long-lasting wear resistance and minimal deformation under load.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The 1/4-20 UNC coarse thread with Class 3A fit provides reliable engagement in high-vibration settings, reducing the risk of loosening. The black oxide finish enhances corrosion resistance, making it suitable for applications in chemical processing, marine environments, and outdoor machinery. Its knurled socket head and hex drive facilitate quick assembly and disassembly, improving maintenance efficiency. With a robust shoulder diameter of 3/8" and precise tolerances, it ensures accurate alignment in pivoting mechanisms, bearings, and linkages, delivering consistent performance in industrial fasteners for automation, aerospace, and heavy equipment sectors.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, featuring a Class 3A thread fit for precise dimensional accuracy. The UNC coarse thread with a 1/4-20 size and 3/4" length ensures compatibility with standard components. Shoulder dimensions include a diameter of 3/8" with tight tolerances (e.g., -0.004" to -0.002") and a length of 1" (±0.005"), supporting reliable fits. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.
