S-90298A637 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
- Precision positioning capability with 3/8" shoulder diameter maintained within ±0.001" tolerance for accurate component alignment
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
- Secure fastening with optimal thread engagement through Class 3A thread fit and coarse 5/16"-18 UNC threading
- Easy installation and removal with hex drive socket and knurled head for improved grip during assembly
- Extended service life with robust shoulder length of 3 1/4" maintained within tight ±0.005" tolerance
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS and REACH
Professional Applications & Engineering Value
This high-precision shoulder screw delivers exceptional engineering value in applications requiring exact component positioning and reliable fastening. The 18-8 stainless steel construction combined with passivated finish provides outstanding corrosion resistance, making it suitable for machinery exposed to moisture, chemicals, or outdoor conditions. The 3/8" shoulder diameter with tight ±0.001" tolerance ensures precise alignment in precision positioning systems, while the Class 3A thread fit and coarse UNC threading prevent loosening under vibration in heavy-duty mechanical assemblies. The knurled head and hex drive design facilitate quick installation and maintenance, reducing assembly time in industrial manufacturing environments.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit with 5/16"-18 UNC coarse threading and features a shoulder diameter tolerance of -0.001" to 0.001" with shoulder length tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications and certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring both mechanical performance standards and environmental regulations are met for global industrial applications.
