S-91185A845 5/16"-18 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual tightening and loosening with the multi-lobe acetal plastic head, providing superior grip without tools in frequent adjustment applications.
• Excellent corrosion resistance due to the 18-8 stainless steel construction, ensuring long-term reliability in various industrial environments.
• Robust and reliable thread engagement from the UNC coarse thread with Class 3A fit, offering high precision and reduced cross-threading risks.
• Durable, non-marring head made from black acetal plastic, protecting surfaces from damage during hand operation.
• Versatile temperature performance with a head temperature range of 32° to 180° F, suitable for many indoor and controlled environments.
• Full threading along the 1 1/4" length allows for adjustable fastening depth and secure holding across a wider range of material thicknesses.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and acceptability in global markets.

Professional Applications & Engineering Value

This 5/16"-18 thumb screw is engineered to solve common challenges in industrial assembly and maintenance where tool-less operation and durability are critical. The 18-8 stainless steel body provides inherent corrosion resistance, making it ideal for equipment in humid or washdown environments. The multi-lobe acetal plastic head offers a secure, comfortable grip for operators, reducing hand fatigue during repeated adjustments on panels, clamps, or access doors. Its UNC coarse threading and Class 3A thread fit ensure quick installation and high reliability, minimizing the risk of stripping in softer materials or pre-tapped holes. Fully threaded and right-hand designed, this screw delivers consistent clamping force and is widely used in electronics, machinery, and fixture applications requiring frequent, manual access.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for precise, high-quality engagement. The screw is fully threaded and right-hand direction. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for use in regulated industries.