S-97768A378 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 black oxide finish, ideal for harsh industrial environments
- Exceptional load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Precise alignment and reduced wear thanks to Class 3A thread fit and controlled shoulder diameter/length tolerances
- Secure, non-slip installation with knurled head and 3/16" hex drive for reliable torque transmission
- Optimized for high-vibration environments through coarse UNC threading and right-hand thread direction
- Extended service life ensured by Rockwell B55 hardness and durable shoulder construction
- Regulatory compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial use
Professional Applications & Engineering Value
This black oxide shoulder screw delivers critical engineering solutions where precision alignment and rotational stability are paramount. The 18-8 stainless steel core provides excellent corrosion resistance in manufacturing, automation, and machinery applications, while the 1-3/4" shoulder length with tight tolerances ensures precise component spacing and reduced bearing wear. The coarse UNC thread maintains secure fastening in high-vibration equipment, and the knurled socket head with hex drive prevents tool slippage during installation. These shoulder screws are engineered to replace more complex bushing and bolt assemblies, simplifying design while providing reliable performance in pivots, linkages, and rotating mechanisms across industrial sectors.
Specification Summary & Compliance
This precision shoulder screw features 5/16"-18 UNC coarse threads with Class 3A thread fit for superior engagement. Critical dimensions include shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 1-3/4" (tolerance: -0.005" to 0.005") ensuring precise component alignment. Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these fasteners suitable for global industrial applications requiring certified components.
