S-8077A676 1/4"-28 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 extended service life.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in demanding applications.
- Precise shoulder fit and alignment with controlled diameter and length tolerances, ensuring accurate component positioning.
- Enhanced durability and wear resistance from the black oxide finish and Rockwell B79 hardness, reducing maintenance needs.
- Secure, non-slip fastening facilitated by the knurled socket head and hex drive, allowing for high-torque installation.
- Fine UNF thread (Class 3A) provides superior vibration resistance and a tighter seal compared to coarse threads.
- Full compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 1/4"-28 UNF fine thread and Class 3A fit deliver excellent vibration resistance, preventing loosening in dynamic systems like robotics, automotive fixtures, and conveyor equipment. The 3/8" shoulder length and precise diameter tolerances allow for accurate pivoting, spacing, and alignment of components such as gears, bearings, and linkages, reducing wear and misalignment. The black oxide finish on the corrosion-resistant 316 stainless steel enhances durability in moist or chemical-exposed environments, making it a reliable choice for food processing, marine, and chemical industry applications where both strength and corrosion resistance are paramount.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A tolerance for high precision, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and a shoulder length of 1/8" (tolerance: -0.005" to 0.005"). It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring it is free from hazardous substances and suitable for global industrial use.
