S-90079A670 1/2"-13 x 3 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual torque application with a 1 1/4" knurled head for superior grip and easy hand-tightening without tools
• High tensile strength and durability with 70,000 psi tensile strength and Rockwell B84 hardness for reliable performance in demanding environments
• Secure and precise coarse threading using 1/2"-13 UNC Class 2A threads for quick assembly and vibration resistance
• Corrosion-resistant black-oxide steel construction providing long-lasting protection and reduced maintenance in industrial settings
• Extended tip design for easier alignment and initial engagement in assembly applications
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use across various industries
• Partially threaded shank offering optimal clamping force distribution for secure fastening

Professional Applications & Engineering Value

This black-oxide steel thumb screw delivers exceptional engineering value through its knurled head design and coarse UNC threading, specifically addressing industrial fastening challenges. The 1/2"-13 thread size with Class 2A fit ensures precise engagement and vibration resistance in machinery, equipment panels, and access covers. The extended tip facilitates quick alignment and installation, reducing assembly time in maintenance operations. With 70,000 psi tensile strength and Rockwell B84 hardness, it withstands repeated adjustments and high-stress applications without deformation. The black-oxide surface treatment provides corrosion resistance, making it ideal for industrial environments where durability and reliability are paramount for thumb screw applications requiring manual operation and frequent access.

Specification Summary & Compliance

This thumb screw features 1/2"-13 UNC coarse threads with Class 2A thread fit for standard industrial applications. Manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel and REACH (EC 1907/2006) compliance. The partially threaded design extends 2 3/4" with a 3 1/2" overall length, while the extended tip measures 0.25" in length and 25/64" in diameter for precise engagement.