S-8077A658 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 and black oxide finish, ideal for harsh industrial environments
- High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Precise thread engagement via Class 3A fit and UNC coarse thread, ensuring reliable fastening and vibration resistance
- Easy installation and removal with hex socket drive and knurled head for improved grip during assembly
- Accurate shoulder positioning with controlled diameter and length tolerances for consistent component alignment
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety
- Durable construction with Rockwell B79 hardness, providing long-term performance in mechanical assemblies
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with black oxide finish is engineered to address critical challenges in precision machinery, automation systems, and industrial equipment. The Class 3A thread fit and UNC coarse thread design prevent loosening under vibration, while the knurled head and hex socket drive facilitate quick installation in confined spaces. The shoulder diameter and length with tight tolerances ensure accurate alignment of moving parts, reducing wear and maintenance costs. Ideal for rotational assemblies, pivoting mechanisms, and corrosion-prone environments, this fastener delivers reliable performance where dimensional stability and chemical resistance are paramount.
Specification Summary & Compliance
This shoulder screw adheres to inch system measurements with a 1/4"-20 UNC thread and Class 3A thread fit for high precision. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory conformity for industrial use.
