S-93395A172 M2.5 x 4 mm DIN 7991 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life.
• High-strength fastening with a tensile strength of 70,000 psi, ensuring reliable performance in demanding mechanical assemblies.
• Precise and secure installation via the 1.5 mm hex drive, providing excellent torque transfer and reducing the risk of tool slippage.
• Optimized thread engagement with a coarse thread pitch and Class 6g thread fit, enabling quicker assembly and robust holding power.
• Flush and clean finish due to the standard 90° countersink flat head, which sits neatly in tapered seats for a smooth surface profile.
• Full threading along the 4 mm length for maximum grip and uniform stress distribution across the entire fastened joint.
• Compliance with international standards including DIN 7991, RoHS 3, and REACH, ensuring product safety and regulatory acceptance.

Professional Applications & Engineering Value

Engineered for precision and durability, these M2.5 metric flat head screws in 316 stainless steel address critical challenges in industrial settings, such as corrosion in marine, chemical, or outdoor applications. The passivated finish enhances surface integrity, while the coarse thread spacing and Class 6g thread fit facilitate rapid, secure installations—minimizing assembly time and preventing cross-threading. Ideal for machinery, electronics, and automotive components, the fully threaded design and hex drive ensure consistent clamping force and ease of maintenance, making them a reliable choice for engineers seeking long-term performance and compliance with DIN 7991 specifications.

Specification Summary & Compliance

This screw features a Metric M2.5 x 0.45 mm coarse thread with a Class 6g tolerance for precise fit, a head diameter of 5 mm (tolerance: -0.3 to 0 mm), and a length of 4 mm. It conforms to DIN 7991 manufacturing standards and is verified to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations.