S-91746A840 4-40 x 1" Thumb 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.
• Effortless manual tightening and loosening thanks to the knurled round head design, providing excellent grip without tools.
• High tensile strength of 80,000 psi ensures reliable fastening under load, reducing the risk of failure in demanding applications.
• Rockwell B85 hardness offers excellent durability and resistance to wear, maintaining performance over repeated use.
• Precise 4-40 UNC coarse threading with Class 2A fit allows for quick assembly and secure engagement in various materials.
• Fully threaded 1" length provides consistent holding power along the entire screw, enhancing versatility in different thicknesses.
• Compliance with RoHS 3 and REACH regulations ensures safety and environmental responsibility, meeting global standards for industrial components.

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw is engineered to address common industrial challenges, such as frequent adjustments and exposure to corrosive elements. The knurled round head with a narrow profile enables quick, tool-free operation in tight spaces, reducing assembly time and minimizing the need for additional tools. Its 4-40 UNC coarse thread and Class 2A fit ensure reliable engagement in metals, plastics, and composites, preventing cross-threading and enhancing connection integrity. With a fully threaded design and high tensile strength, it provides consistent clamping force in applications like electronics enclosures, machinery panels, and laboratory equipment, where durability and ease of use are critical. The slotted drive offers compatibility with standard screwdrivers for added flexibility, making it a versatile choice for maintenance and production lines.

Specification Summary & Compliance

This thumb screw features precise 4-40 UNC coarse threading with a Class 2A thread fit for accurate dimensional tolerance, ensuring smooth installation and secure fastening. Manufactured from 18-8 stainless steel, it meets industry standards for strength and corrosion resistance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety requirements for industrial components.