S-91273A565 1/4"-20 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 18-8 stainless steel 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.
- Precision Class 2A thread fit guarantees smooth assembly and secure fastening in demanding applications.
- Knurled head and hex drive design provides excellent grip and easy installation with standard tools, minimizing slippage.
- Durable Rockwell B55 hardness offers long-lasting wear resistance and maintains thread integrity over repeated use.
- RoHS 3 and REACH compliance ensures environmental safety and meets global regulatory standards for industrial components.
- Coarse UNC threads enable quick engagement and are less prone to clogging in dirty or high-vibration settings.
Professional Applications & Engineering Value
This black oxide 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly jigs. The 3/8" shoulder length provides accurate alignment and acts as a pivot or bearing surface, reducing wear on connected parts. With a 1/4"-20 UNC coarse thread and Class 2A fit, it ensures rapid installation and secure holding in high-vibration environments, such as robotics and conveyor systems. The combination of 70,000 psi tensile strength and corrosion-resistant finish extends service life, minimizing downtime and maintenance costs in demanding industrial applications.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for precise tolerance. Key dimensions include a shoulder diameter of 1/4" with tolerance from -0.004" to -0.002", and shoulder length of 5/8" with tolerance from -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.
