S-97768A439 3/8"-16 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 black oxide finish, ideal for harsh industrial environments
- Exceptional mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications
- Precision shoulder control with tight diameter tolerance (-0.004" to -0.002") ensuring accurate alignment and reduced assembly vibration
- Enhanced grip and torque application through knurled head texture and hex drive design for secure installation
- Reliable thread engagement with Class 3A UNC coarse threads providing superior fastening security
- Broad compliance coverage meeting ASME B18.3 standards while being RoHS 3 and REACH compliant for global applications
- Optimized shoulder length (1 7/8") with minimal tolerance variation for consistent spacing and positioning
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw with black oxide finish addresses critical engineering challenges in precision assemblies. The 1/2" shoulder diameter with tight tolerance control provides exact locating and alignment in machinery, robotics, and automation equipment, eliminating bushing requirements and reducing component count. The Class 3A UNC thread fit ensures vibration resistance in dynamic applications, while the knurled socket head facilitates secure tool engagement during installation. With 70,000 psi tensile strength, this industrial shoulder bolt maintains structural integrity under heavy loads, making it ideal for pivoting mechanisms, gear assemblies, and precision manufacturing equipment where dimensional stability and corrosion resistance are paramount.
Specification Summary & Compliance
This 3/8"-16 UNC shoulder screw features precision Class 3A thread fit with coarse thread spacing for optimal engagement. The shoulder maintains tight diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005") for consistent performance. Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring suitability for regulated industries and international markets.
