S-8077A276 7/8"-9 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
- Exceptional corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments
- Precise component alignment ensured by Class 3A thread fit and standard shoulder fit for reduced assembly time and improved accuracy
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
- Secure, non-slip installation with knurled socket head and 5/8" hex drive for reliable torque transmission
- Durable coarse threading using 7/8"-9 UNC threads that resist loosening under vibration and heavy loads
- Consistent dimensional accuracy with tight shoulder diameter and length tolerances for repeatable positioning
- Full regulatory compliance meeting ASME B18.3 standards and environmental directives including RoHS 3 and REACH
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish enhances surface durability and provides an additional layer of corrosion protection, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. The Class 3A thread fit and precisely machined shoulder with knurled socket head ensure secure fastening and accurate alignment of rotating components, bushings, and linkages. With a 70,000 psi tensile strength and coarse UNC threading, it maintains integrity under high stress and vibrational forces, reducing maintenance needs and downtime in industrial assembly lines, automotive jigs, and material handling systems.
Specification Summary & Compliance
This shoulder screw features 7/8"-9 UNC coarse threads with Class 3A fit for superior thread engagement. Shoulder dimensions include a diameter of 1 1/4" (tolerance: -0.004" to -0.002") and length of 1 1/2" (tolerance: -0.005" to 0.005"). Manufactured to ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use in global markets.
