S-8077A824 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
- Exceptional corrosion resistance with 316 stainless steel and black oxide finish, ideal for harsh industrial environments
- High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads
- Precise Class 3A thread fit provides superior engagement and vibration resistance in demanding applications
- Knurled head texture offers improved grip during manual installation and adjustments
- Standard hex drive compatibility (5/32") allows for easy installation with common tools
- Accurate shoulder positioning with controlled diameter and length tolerances for consistent assembly alignment
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with black oxide finish delivers exceptional durability in corrosive environments where standard fasteners fail. The Class 3A thread fit and UNC coarse threading provide secure fastening in high-vibration applications, while the precisely machined shoulder maintains accurate component alignment in assemblies requiring rotational or linear movement. Engineered to ASME B18.3 specifications, this socket head shoulder screw is ideal for precision machinery, automotive components, and industrial equipment where reliable shoulder positioning and corrosion resistance are critical. The combination of 70,000 psi tensile strength and Rockwell B79 hardness ensures long-term performance in demanding mechanical systems.
Specification Summary & Compliance
This shoulder screw features precision Class 3A thread fit with 1/4"-20 UNC coarse threads and right-hand thread direction. Critical dimensions include shoulder diameter of 5/16" (-0.004" to -0.002" tolerance) and shoulder length of 1-1/8" (-0.005" to 0.005" tolerance). The component meets ASME B18.3 manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
