S-91259A132 3/4"-10 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 load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications.
- Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A fit ensuring consistent, vibration-resistant connections in critical assemblies.
- Enhanced durability from Rockwell C32 hardened alloy steel, resisting wear and deformation under heavy loads.
- Secure installation and removal with a 1/2" hex drive and knurled head for improved grip and torque application.
- Accurate alignment and spacing due to the precision-machined shoulder with tight diameter and length tolerances.
- Broad industry compliance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality and safety assurance.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical alignment and high-load challenges in industrial machinery, automation systems, and heavy equipment. The alloy steel construction, hardened to Rockwell C32, provides exceptional strength to withstand dynamic forces and repetitive stress, reducing the risk of fastener failure. The black oxide finish offers reliable corrosion protection, essential for environments exposed to moisture or chemicals. With a Class 3A thread fit and precise UNC coarse threads, it ensures quick assembly and maintains clamp load under vibration, making it ideal for pivots, shafts, and rotating components. The knurled socket head and hex drive facilitate easy installation in confined spaces, enhancing efficiency in maintenance and production lines.
Specification Summary & Compliance
This shoulder screw features a 3/4"-10 UNC Class 3A thread with coarse spacing for robust engagement, and a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precise fit. Manufactured in compliance with ASME B18.3 and ASTM A574 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence for global industrial use.
