S-93005A110 1/4"-20 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual operation with a large aluminum four-arm head for superior grip and torque application without tools
• Enhanced durability and corrosion resistance from the black-oxide steel finish, extending service life in demanding environments
• Reliable fastening strength with a high 70,000 psi tensile strength and Rockwell C40 hardness to withstand heavy-duty applications
• Quick and easy installation due to the coarse UNC thread and Class 2A fit, ensuring smooth engagement and time savings
• Secure and stable seating provided by the extended tip and collar design, improving alignment and vibration resistance
• Compliance with environmental standards, being RoHS 3 compliant, making them suitable for regulated industries
• Versatile partial threading allows for precise clamping force control on shafts or in adjustment mechanisms

Professional Applications & Engineering Value

These black-oxide steel thumb screws are engineered to solve common industrial fastening challenges, such as the need for tool-free assembly and disassembly in high-vibration or frequently adjusted equipment. The aluminum four-arm head offers excellent ergonomics, reducing operator fatigue during repeated use, while the coarse UNC 1/4"-20 thread with a Class 2A fit ensures quick, reliable threading into components without cross-threading risks. Ideal for applications in machinery, electronics enclosures, and prototyping, the partially threaded design and extended tip provide secure positioning on rods or in knurled inserts, enhancing stability in dynamic environments. This combination of high tensile strength and corrosion-resistant finish delivers long-term performance, minimizing maintenance and replacement costs in industrial settings.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and ease of assembly. It is manufactured from black-oxide steel with an aluminum head, featuring a right-hand thread, coarse spacing, and partial threading. Compliance includes RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel, ensuring environmental regulatory adherence for global industrial use.