S-91259A156 4-40 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 strength and durability with 140,000 psi tensile strength and Rockwell C32 hardness, ensuring reliable performance in high-stress applications.
- Precise alignment and smooth rotation thanks to the 1/8" diameter shoulder with tight tolerances, reducing wear and improving machinery accuracy.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Easy installation and removal with a hex socket drive (5/64"), allowing for secure tightening in confined spaces.
- Wide compatibility and secure fastening due to 4-40 UNC coarse threads and Class 3A fit, providing vibration resistance and quick assembly.
- Compliance with rigorous standards including ASTM A574, RoHS 3, and REACH, ensuring safety and environmental responsibility.
- Cost-effective maintenance from the alloy steel construction, offering long-term reliability and reduced downtime.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies. Its 4-40 UNC coarse threads and Class 3A fit ensure a secure, vibration-resistant connection, ideal for applications like pivots, spacers, and rotating components in automotive, aerospace, and manufacturing equipment. The black oxide finish enhances corrosion resistance, while the smooth 1/8" shoulder diameter provides exact alignment, minimizing friction and wear. With high tensile strength and hardness, it supports heavy loads and repetitive motion, reducing the risk of failure and maintenance costs in demanding environments.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It meets ASTM A574 specifications for high-strength alloy steel, ensuring consistent quality. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and regulatory requirements in global markets.
