S-91259A574 1/4"-20 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 demanding applications.
- Superior corrosion resistance provided by the black oxide finish, extending service life in harsh industrial environments.
- Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening.
- Enhanced grip and handling from the knurled head texture, allowing for easier installation and removal even in tight spaces.
- High durability and wear resistance due to alloy steel construction and Rockwell C32 hardness, minimizing deformation under stress.
- Wide compatibility with standard 5/32" hex drive tools, facilitating quick assembly and maintenance.
- Regulatory peace of mind with compliance to ASME B18.3, ASTM A574, RoHS 3, and REACH standards for safe, quality-assured use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical alignment and pivot point challenges in industrial machinery, automation systems, and precision equipment. The 1/4"-20 UNC coarse thread with Class 3A fit provides excellent resistance to loosening under vibration, while the black oxide finish offers reliable protection against rust and corrosion in humid or abrasive conditions. The shoulder diameter and length, held to tight tolerances, ensure precise component positioning, reducing wear and misalignment in rotating assemblies. Ideal for use in robotic arms, conveyor systems, and fixture jigs, this screw delivers consistent performance where high tensile strength and dimensional accuracy are paramount for operational reliability.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards for precise dimensional control. Manufacturing follows ASME B18.3 and ASTM A574 specifications, ensuring consistent quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substance restrictions.
