S-90298A633 5/16"-18 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 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Precise component alignment through the 2-1/4" shoulder with tight ±0.005" length tolerance for reliable assembly
- High-load bearing capability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure installation and removal via hex drive socket and knurled head design preventing tool slippage
- Reliable thread engagement with Class 3A thread fit ensuring consistent fastening performance
- Industry-standard compatibility meeting ASME B18.3 specifications for interchangeability
- Environmental compliance with RoHS 3 and REACH regulations for safe usage in regulated industries
Professional Applications & Engineering Value
This stainless steel shoulder screw delivers exceptional engineering value in precision machinery and industrial equipment where alignment accuracy and corrosion resistance are critical. The 5/16"-18 UNC coarse thread with Class 3A fit provides superior thread engagement in metal components, while the precisely machined shoulder maintains exact positioning of rotating parts, pulleys, and gears. The passivated finish on the 18-8 stainless steel material significantly enhances corrosion resistance in demanding environments, extending service life. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable performance under vibration and load stress, making it ideal for automation systems, conveyor equipment, and precision manufacturing applications where component misalignment can cause operational failures.
Specification Summary & Compliance
Manufactured to exact ASME B18.3 specifications with Class 3A thread fit for superior dimensional accuracy. The shoulder maintains tight tolerances with diameter controlled within -0.001" to 0.001" and length within -0.005" to 0.005". This socket head shoulder screw features 5/16"-18 UNC coarse thread configuration with right-hand thread direction. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across various industrial sectors.
