S-90278A504 M4 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise component alignment ensured by the accurately machined shoulder with tight diameter tolerance (-0.025 to 0 mm)
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing
• Secure, tamper-resistant installation using the 2.5 mm hex socket drive for flush mounting in confined spaces
• Consistent thread engagement with Class 6g metric coarse threads (M4x0.7) for vibration resistance
• Extended service life due to the smooth, durable shoulder surface reducing wear on mating parts
• Environmental regulation compliance meeting RoHS 3 and REACH standards for global supply chain integration

Professional Applications & Engineering Value

This precision shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial assemblies. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, while the 18mm shoulder length with precise tolerances acts as a reliable axle or spacer in machinery, eliminating misalignment in rotating parts like gears, linkages, and bearings. The M4 coarse thread and Class 6g thread fit ensure rapid, secure fastening in high-vibration environments, reducing maintenance downtime. Its socket head hex drive allows for compact tool access, making it ideal for automated equipment, conveyor systems, and precision instruments where space and reliability are paramount.

Specification Summary & Compliance

This M4 shoulder screw features a 5mm thread length with Class 6g thread fit per metric standards, and a shoulder diameter tolerance of -0.025 to 0 mm with shoulder length tolerance of 0 to 0.05 mm for precise assembly. Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring adherence to international environmental and safety regulations.