S-99154A306 2-56 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
• Enhanced assembly precision due to the precisely machined shoulder (3/32" diameter, 1/4" length) for accurate component alignment and reduced wear.
• High-strength performance offering a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable load-bearing in demanding applications.
• Space-saving low-profile socket head allows for installation in tight spaces while providing a secure slotted drive for easy torque application.
• Consistent and reliable fastening ensured by the Class 2A thread fit and coarse UNC thread, promoting smooth engagement and vibration resistance.
• Compliance with global standards including RoHS 3 and REACH, ensuring material safety and environmental responsibility for international supply chains.
• Right-hand thread design for standard installation procedures, improving efficiency in high-volume assembly operations.

Professional Applications & Engineering Value

This 2-56 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for applications in electronics, machinery, and automotive components where environmental factors are a concern. The low profile socket head design minimizes protrusion, allowing for compact designs without compromising on drive security. The precise shoulder fit acts as a pivot or bearing surface, reducing wear on mated parts and maintaining alignment under dynamic loads. This combination of high tensile strength and coarse UNC threads ensures reliable performance in vibratory environments, offering long-term value by minimizing maintenance and replacement costs in industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder diameter is 3/32" with a tolerance of -0.001" to 0", and the shoulder length is 1/4" with a tolerance of 0" to 0.002", ensuring precise assembly. It is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting sustainable industrial practices.