S-91054A466 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance – TiCN coating on 18-8 stainless steel provides superior wear and chemical resistance, extending service life in harsh environments.
• Precise Shoulder Alignment – A 1/8" diameter shoulder with tight tolerance ensures accurate component positioning and reduces assembly misalignment.
• High Tensile Strength – Rated at 70,000 psi, this screw withstands heavy loads and mechanical stress without failure.
• Reliable Thread Engagement – Class 2A UNC coarse threads offer consistent fastening and ease of installation in industrial applications.
• Secure Hex Drive Operation – 5/64" hex socket drive allows for high torque application and prevents stripping during tightening.
• Consistent Hardness – Rockwell B55 hardness ensures the screw maintains its shape and performance under repeated use.
• Compliance with Environmental Standards – Meets RoHS 3 and REACH regulations, making it suitable for global industrial and electronic applications.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 1/8" diameter shoulder with precise fit tolerance ensures components like gears, bearings, and linkages are accurately positioned, minimizing vibration and wear. Made from 18-8 stainless steel and finished with a TiCN coating, it resists corrosion and abrasion in demanding environments such as machinery, automotive, and electronics. The coarse UNC threads and Class 2A fit provide reliable fastening, while the hex socket drive enables efficient installation in confined spaces. Ideal for applications requiring high tensile strength and long-term reliability, this screw reduces maintenance needs and enhances operational safety.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.002" to 0") and shoulder length of 3/4" (tolerance: 0" to 0.003"), ensuring precise assembly. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial use without hazardous substances.