S-97768A330 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 and black oxide finish, ideal for harsh industrial environments.
- Precise component alignment ensured by the 2-1/2" shoulder length with tight tolerances for reliable assembly.
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
- Secure, vibration-resistant fastening due to Class 3A thread fit and coarse UNC threads for quick installation.
- Easy installation and removal with hex drive socket and knurled head for improved grip and torque application.
- Durability and wear resistance from Rockwell B55 hardness, extending service life in mechanical assemblies.
- Regulatory compliance and reliability meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured use.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The 18-8 stainless steel construction, combined with a black oxide finish, provides superior resistance to rust and corrosion, making it suitable for environments exposed to moisture or chemicals. The 2-1/2" shoulder length with minimal tolerances ensures accurate positioning of moving parts, such as gears and pulleys, reducing misalignment and wear. With 1/4"-20 UNC coarse threads and Class 3A fit, it offers quick assembly and high clamping force, ideal for applications in automotive, aerospace, and manufacturing where vibration resistance and strength are paramount. The hex drive socket and knurled head enhance handling efficiency, saving time in maintenance and production cycles.
Specification Summary & Compliance
This shoulder screw features precise dimensional accuracy, including a Class 3A thread fit for tight tolerances 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 quality in industrial use.
