S-91259A319 7/8"-9 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 shear strength for reliable performance in demanding applications.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder fit for minimal play and vibration resistance.
- Easy installation and removal with the 5/8" hex drive and knurled head for secure tool grip and high-torque applications.
- Robust durability from alloy steel construction and Rockwell C32 hardness, resisting wear and deformation under stress.
- Wide compatibility with 7/8"-9 UNC coarse threads and right-hand threading, meeting ASME B18.3 standards for interchangeability.
- Environmental and regulatory compliance with RoHS 3 and REACH, ensuring safe use in global markets.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in high-stress machinery and precision equipment. The black oxide finish provides enhanced corrosion resistance, ideal for environments exposed to moisture or chemicals. With a Class 3A thread fit and coarse UNC thread, it offers secure fastening and reduced risk of loosening in vibrating systems. The knurled head and hex drive facilitate easy installation in confined spaces, while the precise shoulder diameter and length ensure accurate alignment in assemblies like rotating shafts, pivots, and guides. Its high tensile strength makes it suitable for heavy-duty applications in automotive, aerospace, and industrial machinery, where reliability and longevity are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It features a 7/8"-9 UNC coarse thread and right-hand direction, ensuring compatibility with standard components. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety regulations for industrial use.
