S-97768A345 1/4"-20 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 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and stress.
- Precision Class 3A thread fit and UNC coarse threading provide secure, vibration-resistant fastening in demanding applications.
- Rockwell B55 hardness offers enhanced durability and wear resistance for extended service life.
- Knurled head and hex drive design allows for easy installation and removal, even in tight spaces.
- Standard shoulder fit and diameter ensures consistent alignment and smooth rotation in assemblies.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The 18-8 stainless steel material combined with a black oxide finish provides superior resistance to rust and corrosion, making it suitable for humid or chemically aggressive settings. Its 1/4"-20 UNC coarse threads and Class 3A fit ensure minimal backlash and reliable clamping force, reducing the risk of loosening under vibration. The knurled socket head and hex drive facilitate quick assembly and disassembly, saving time in maintenance-intensive applications like conveyor systems, robotic arms, and mounting fixtures. With a robust 70,000 psi tensile strength, it supports high-stress operations, enhancing the longevity and reliability of your equipment.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a 1/4"-20 UNC thread with Class 3A fit and a shoulder diameter tolerance of -0.004" to -0.002". It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
