S-8077A675 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
- Exceptional corrosion resistance from 316 stainless steel and black oxide finish, ideal for harsh industrial environments.
- High tensile and shear strength (70,000 psi and 35,000 psi minimum) for reliable performance under heavy loads.
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening in critical assemblies.
- Knurled socket head provides superior grip and prevents tool slippage during installation.
- Standardized shoulder dimensions with tight tolerances for accurate alignment and smooth rotational movement.
- Compliance with ASME B18.3 guarantees consistent quality and interchangeability in professional applications.
- RoHS 3 and REACH compliant for safe use in regulated industries and global markets.
Professional Applications & Engineering Value
This 1/4"-28 UNF shoulder screw is engineered to address common challenges in precision machinery and assembly. The 316 stainless steel construction, combined with a black oxide finish, provides outstanding resistance to corrosion and chemicals, making it suitable for marine, chemical processing, and outdoor equipment. The Class 3A thread fit and fine UNF threading ensure minimal backlash and secure fastening in high-vibration environments, such as robotics, automotive systems, and aerospace components. The knurled socket head allows for easy, torque-efficient installation with standard hex tools, reducing assembly time and improving workplace safety. Its robust shoulder design acts as a precise pivot or spacer, maintaining alignment in rotating parts and reducing wear in demanding industrial fasteners applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNF fine threading (1/4"-28) for high precision. Shoulder diameter and length tolerances are tightly controlled (e.g., diameter: -0.004" to -0.002") to ensure consistent performance. Manufactured in compliance with ASME B18.3 standards, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
