S-97768A317 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
- Superior corrosion resistance with black oxide finish on 18-8 stainless steel, ideal for harsh industrial environments
- Precise alignment and smooth rotation ensured by the 1-1/4" shoulder length with tight diameter tolerance
- High tensile strength of 70,000 psi and Rockwell B55 hardness for reliable performance under heavy loads
- Secure installation and removal with 5/32" hex drive and knurled head for enhanced grip
- Accurate thread engagement with Class 3A fit and 1/4"-20 UNC coarse threads for quick assembly
- Compliance with ASME B18.3 standards ensures consistent quality and interchangeability
- Environmentally safe with RoHS 3 and REACH compliance, meeting global regulatory requirements
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The 18-8 stainless steel construction, combined with a black oxide finish, provides excellent resistance to rust and wear, extending service life in demanding conditions. The 1-1/4" shoulder length with minimal tolerance variations ensures precise component positioning, reducing misalignment and vibration issues. Featuring a 1/4"-20 UNC thread with Class 3A fit, it offers reliable fastening in applications such as pivots, shafts, and bearing mounts, where consistent performance and easy maintenance are essential. The socket head with hex drive allows for efficient installation in confined spaces, making it a versatile solution for engineers seeking durability and precision.
Specification Summary & Compliance
This shoulder screw adheres to tight dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". The threads conform to Class 3A fit and UNC coarse spacing, ensuring reliable engagement. It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
