S-91273A307 5/16"-18 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 construction, ideal for harsh environments and extended service life.
- Exceptional tensile strength of 70,000 psi ensures reliable load-bearing capacity and resistance to mechanical failure.
- Precision Class 2A thread fit guarantees consistent engagement and secure fastening in assembly applications.
- Knurled socket head with 5/32" hex drive provides enhanced grip and prevents tool slippage during installation.
- Rockwell B55 hardness offers excellent wear resistance, maintaining dimensional stability under stress.
- 3/4" shoulder length with tight tolerances enables accurate component alignment and acts as a pivot or shaft.
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global industrial markets.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 5/16"-18 UNC coarse thread with a Class 2A fit ensures quick assembly and reliable retention in high-vibration environments, such as machinery, automotive systems, and precision instruments. The 3/4" shoulder length provides a stable bearing surface for rotating parts, reducing wear and simplifying design. With a knurled socket head and hex drive, it allows for secure tool engagement, minimizing installation errors. Its high tensile and shear strength makes it suitable for demanding applications where failure is not an option, supported by corrosion-resistant properties for long-term performance.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/4" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated industrial use without hazardous substances.
