S-91882A445 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual installation and removal with a large 1 1/4" diameter knurled round head for superior grip, even with gloves.
• Enhanced durability and corrosion resistance thanks to the black-oxide steel finish, extending service life in demanding environments.
• Reliable and robust fastening with a high 70,000 psi tensile strength and Rockwell B84 hardness to withstand significant loads.
• Quick and easy coarse threading with the 5/16"-18 UNC thread and Class 2A fit, ensuring faster assembly and reduced cross-threading risk.
• Versatile and secure hold provided by the fully threaded 1 1/2" length, offering maximum engagement in a wide range of material thicknesses.
• Confident use in regulated industries as the screw is fully compliant with RoHS 3 and REACH environmental and safety standards.
• Convenient raised head profile allows for easier finger-grasping compared to flat designs, improving ergonomics.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to solve common industrial challenges where tools are impractical or speed is essential. The coarse UNC thread and Class 2A fit enable rapid installation and disassembly in soft metals, wood, and plastics, minimizing production downtime. The knurled head texture provides a non-slip surface, ensuring a secure grip for operators in high-vibration environments or when wearing protective gloves. Its 70,000 psi tensile strength makes it a heavy-duty choice for securing access panels, machine guards, and jigs in manufacturing, maintenance, and assembly lines. The robust black-oxide finish offers a layer of protection against rust, making it suitable for use in electronics enclosures and outdoor equipment where occasional moisture exposure is a concern.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit, ensuring standard-compliant dimensional accuracy and reliable engagement. It is manufactured from steel and is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006) as of the latest substance list, confirming its adherence to strict environmental and safety regulations for industrial components.