S-8077A278 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
- Superior corrosion resistance in harsh environments due to 316 stainless steel construction with black oxide finish
- Precise component alignment with consistent shoulder diameter and length tolerances for reliable assembly
- High mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Secure installation and removal with knurled socket head and 5/8" hex drive preventing tool slippage
- Reliable thread engagement with Class 3A thread fit ensuring tight, vibration-resistant connections
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for restricted substance control
Professional Applications & Engineering Value
This heavy-duty shoulder screw solves critical alignment challenges in industrial machinery, automation systems, and precision equipment. The 316 stainless steel material provides exceptional resistance to chemicals, saltwater, and industrial atmospheres, while the black oxide finish enhances corrosion protection and reduces galling. The Class 3A thread fit and precisely controlled shoulder dimensions ensure components maintain perfect alignment under vibration and load, preventing misalignment-induced wear. With 70,000 psi tensile strength, it withstands extreme mechanical stresses in robotics, conveyor systems, and manufacturing equipment where precision shoulder alignment is critical for operational reliability and reduced maintenance intervals.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit for superior thread engagement. Shoulder diameter tolerance: -0.004" to -0.002"; shoulder length tolerance: -0.005" to 0.005". Features UNC coarse threads (7/8"-9) for rapid assembly and Rockwell B79 hardness for durability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
