S-8077A311 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 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
- Enhanced wear resistance and reduced light reflection thanks to the durable Black Oxide finish
- High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
- Precise component alignment and rotation enabled by the 2 1/4" shoulder with standard fit
- Secure, non-slip installation with a knurled socket head and 1/4" hex drive for high-torque applications
- Reliable, precision threading with a 3/8"-16 UNC coarse thread and Class 3A fit for superior engagement and vibration resistance
- Guaranteed quality and safety through compliance with ASME B18.3, RoHS, and REACH standards
Professional Applications & Engineering Value
This 3/8"-16 UNC shoulder screw is engineered to solve critical alignment and durability challenges in industrial assemblies. The 316 Stainless Steel material provides exceptional resistance to corrosion and pitting, making it ideal for marine, chemical processing, and food-grade equipment. The 2 1/4" shoulder length acts as a precise pivot, bearing surface, or locator, eliminating the need for separate spacers or bushings and reducing assembly complexity. Combined with the Black Oxide finish, it offers improved lubricity and wear resistance. The socket head with hex drive and knurled texture ensures a secure grip during high-torque installation, preventing cam-out and reducing the risk of fastener failure in high-vibration environments like machinery, automotive jigs, and conveyor systems.
Specification Summary & Compliance
This shoulder screw features a 3/8"-16 UNC thread with a Class 3A fit for high-precision engagement. The shoulder diameter is 1/2" with a tight tolerance of -0.004" to -0.002", and the shoulder length is 2 1/4" with a tolerance of -0.005" to 0.005" for consistent performance. It is manufactured to ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
