S-98273A110 4-40 x 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping efficiency – Cuts precise threads in pre-drilled holes, eliminating the need for separate tapping operations and reducing assembly time.
• Superior material strength – Made from 410 Stainless Steel for excellent corrosion resistance and durability in demanding industrial environments.
• Optimized drive engagement – Phillips No. 1 drive style provides secure tool engagement, minimizing cam-out and ensuring reliable installation.
• Broad material compatibility – Specifically engineered for use in brass, cast iron, and sheet metal, offering versatile application across different substrates.
• Precision blunt tip design – Facilitates easier starting and straighter thread alignment, reducing the risk of cross-threading and part damage.
• Full threading for maximum grip – Ensures consistent holding power along the entire 1/4" length, providing secure and vibration-resistant fastening.
• Regulatory compliance assurance – Meets RoHS 3 and REACH environmental standards, ensuring safety and suitability for regulated markets.

Professional Applications & Engineering Value

These 4-40 UNC thread cutting screws are engineered to solve common fastening challenges in metalworking and assembly. The coarse UNC thread and thread-cutting (Type 23/T) design enable them to form strong, clean threads in ductile materials like brass, cast iron, and sheet metal without pre-tapped holes. This eliminates tapping operations, speeding up production and reducing labor costs. The 410 Stainless Steel construction provides reliable corrosion resistance, essential for components exposed to moisture or harsh conditions. Combined with the Phillips pan head and blunt tip, these screws ensure easy installation with standard drivers and minimize the risk of material splitting or misalignment, making them ideal for high-volume manufacturing, HVAC systems, and electrical enclosures where precision and durability are critical.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with a Class 2A fit for standard tolerance applications. It is fully threaded with a right-hand direction and is designed for use with a No. 41 drill bit (0.096" diameter). Manufacturing and material compliance include adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they are free from hazardous substances and suitable for global industrial use.