S-8077A844 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 extended service life.
- Enhanced thread reliability with Class 3A fit, ensuring precise engagement and reduced risk of cross-threading in assembly.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding, high-stress applications.
- Secure, non-slip fastening from the knurled head and hex socket drive, providing a firm grip during installation and removal.
- Durable, wear-resistant surface with black oxide finish that adds corrosion protection and a professional appearance.
- Accurate positioning and alignment due to the precisely machined shoulder with controlled diameter and length tolerances.
- Broad industry compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global regulatory acceptance.
Professional Applications & Engineering Value
This 1/4-20 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 316 stainless steel material provides excellent resistance to chemicals and moisture, making it suitable for marine, chemical processing, and outdoor applications. The black oxide finish enhances surface durability and reduces galling, while the Class 3A thread fit ensures reliable, vibration-resistant connections. The knurled head and hex drive design facilitate easy installation in tight spaces, reducing assembly time and improving maintenance efficiency. Ideal for use in pivots, spindles, and rotating assemblies, this screw delivers consistent performance under high shear and tensile loads, minimizing downtime and replacement costs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A precision tolerance for secure fit. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and shoulder length is 13/32" with a tolerance of -0.005" to 0.005". It complies with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to international safety and environmental standards.
