S-97768A373 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 strength of 70,000 psi ensures reliable performance under heavy loads and reduces risk of fastener failure.
- Precise Class 3A thread fit provides smooth assembly and secure fastening, minimizing play in critical applications.
- Knurled head design offers improved grip for manual adjustments and prevents slippage during installation.
- Standard hex drive compatibility allows for easy installation and removal with common tools, saving time on the assembly line.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for global use.
- Durable Rockwell B55 hardness maintains thread integrity and shoulder dimensions over repeated use, extending service life.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and high-stress fatigue. The 1/4"-20 UNC coarse thread and Class 3A fit ensure quick, secure fastening in machinery, automotive, and aerospace assemblies, reducing installation time and improving reliability. The knurled head and hex drive facilitate easy handling in tight spaces, while the 1 1/2" shoulder length provides precise pivot points or spacing in rotating components. Ideal for applications requiring high tensile strength and corrosion resistance, this screw minimizes maintenance and enhances operational efficiency in demanding environments.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for precise tolerance, a shoulder diameter of 3/8" with tight tolerance, and lengths of 3/4" (thread) and 1 1/2" (shoulder). It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safety and environmental standards are upheld.
