S-90910A911 M1.8 x 4 mm ASME B18.3.4M Stainless Steel Button Head Torx Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• Enhanced torque transmission and strip resistance from the T5 Torx drive, ensuring secure fastening and reduced tool wear
• High mechanical strength with 100,000 psi tensile strength and Rockwell B96 hardness for reliable performance under load
• Precise and secure thread engagement due to Class 4g6g thread fit and coarse 0.35 mm pitch, minimizing cross-threading risks
• Low-profile, rounded button head design provides a finished appearance and reduces snagging in compact assemblies
• Full threading along the 4 mm length ensures maximum grip and uniform stress distribution in thin materials
• Compliance with international standards including ASME B18.3.4M, RoHS 3, and REACH for guaranteed quality and safety

Professional Applications & Engineering Value

This M1.8 metric screw is engineered to address critical challenges in precision assembly, such as space constraints and exposure to corrosive elements. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical attack, making it suitable for electronics, medical devices, and outdoor equipment. The T5 Torx drive offers superior torque control compared to traditional drives, reducing the risk of cam-out and damage to the screw head during high-torque applications. With its fully threaded design and coarse thread pitch, it ensures rapid installation and strong holding power in brittle or thin substrates. These features make it an ideal industrial fastener for applications demanding reliability, repeatability, and compliance with stringent industry regulations.

Specification Summary & Compliance

This screw features a metric M1.8 x 0.35 mm thread with Class 4g6g tolerance for precise fit, and is fully threaded over its 4 mm length. It conforms to ASME B18.3.4M for dimensional accuracy and mechanical properties. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets environmental and safety standards for hazardous substances.