S-91746A974 1/4"-28 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a knurled round head for secure grip without tools in tight spaces.
• Superior corrosion resistance from 18-8 Stainless Steel, ideal for harsh or washdown environments.
• High-strength reliability with 80,000 psi tensile strength and Rockwell B83 hardness for demanding applications.
• Precise, secure fastening due to Class 2A thread fit and 1/4"-28 UNF fine threading, minimizing loosening from vibration.
• Full-length threading ensures maximum engagement and adjustability along the entire 1/2" length.
• Regulatory compliance with RoHS 3 and REACH, making it safe for various industrial and electronic uses.
• Dual drive option featuring both a thumb head and slotted drive for flexible installation methods.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Thumb Screw is engineered to solve common industrial challenges where tool-less access, corrosion resistance, and vibration resistance are critical. The knurled round head and narrow profile allow for quick adjustments in confined panels, machinery guards, and electronic enclosures. Its fine UNF threading and Class 2A fit provide a tight, reliable seal that resists loosening under dynamic loads, making it ideal for assembly lines, OEM equipment, and maintenance kits. The material’s innate durability ensures long service life, reducing replacement frequency and downtime in corrosive or high-moisture environments.

Specification Summary & Compliance

This thumb screw adheres to UNF thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is fully threaded and features a right-hand thread direction. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial and consumer applications.