S-91259A354 1 1/8"-7 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 load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications.
- Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
- Precise alignment and reduced wear with a Class 3A thread fit and controlled shoulder diameter/length tolerances for consistent assembly.
- High torque application capability enabled by the 7/8" hex drive and knurled head for secure, non-slip installation.
- Robust material integrity from alloy steel with Rockwell C32 hardness, ensuring durability and resistance to deformation.
- Wide compatibility with 1 1/8"-7 UNC coarse threads and right-hand threading, suitable for various machinery and equipment.
- Regulatory compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for safe, global use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in industrial assemblies, such as misalignment and component wear. The 1 1/2" shoulder length with tight tolerances (-0.005" to 0.005") ensures precise positioning of parts like gears and pulleys, reducing vibration and extending machinery life. The black oxide finish provides an added layer of corrosion resistance, ideal for environments exposed to moisture or chemicals. With a coarse UNC thread and Class 3A fit, it offers quick installation and high clamping force, making it perfect for heavy-duty applications in automotive, aerospace, and manufacturing sectors. The socket head design with a 7/8" hex drive allows for easy access in confined spaces, enhancing assembly efficiency.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, ensuring dimensional accuracy with a Class 3A thread fit for superior engagement. Key tolerances include shoulder diameter (-0.004" to -0.002") and shoulder length (-0.005" to 0.005"), guaranteeing precise fits in assemblies. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in restricted substance-sensitive applications.
