S-91259A112 5/16"-18 ASME B18.3, ASTM A574 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 durability and corrosion resistance with a black oxide finish, ideal for harsh industrial environments.
- High tensile and shear strength (140,000 psi tensile, 84,000 psi shear) ensures reliable performance under heavy loads.
- Precise alignment and smooth rotation provided by the 4-1/2" shoulder with tight diameter and length tolerances.
- Secure, non-slip installation with a knurled socket head and hex drive for easy torque application.
- Consistent, reliable threading with Class 3A fit and coarse UNC threads for quick assembly and vibration resistance.
- Robust material performance from alloy steel with Rockwell C32 hardness for long-term wear resistance.
- Broad compliance and safety meeting ASME B18.3 standards and RoHS 3/REACH regulations for quality assurance.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and strength challenges in precision machinery, such as in automated assembly systems, robotic linkages, and rotating shaft applications. The 4-1/2" shoulder length with minimal tolerances ensures exact component positioning, reducing wear and misalignment. Combined with the 5/16"-18 UNC coarse thread and Class 3A fit, it offers quick, secure fastening that withstands vibrations and dynamic loads. The black oxide finish enhances corrosion resistance, while the knurled socket head allows for easy, high-torque installation in confined spaces. Ideal for industries requiring high-strength, precision shoulder screws, this fastener delivers consistent performance in demanding environments.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a shoulder diameter of 3/8" with a tolerance of -0.004" to -0.002" and a shoulder length of 4-1/2" with a tolerance of -0.005" to 0.005". The thread is 5/16"-18 UNC with a Class 3A fit for high accuracy. It complies with ASME B18.3 specifications, RoHS 3 (2015/863/EU), and REACH (EC 1907/2006) standards, ensuring quality and environmental safety.
