S-95150A131 1/4"-28 Thumb Nuts

Key Features & Benefits at a Glance

• Excellent corrosion resistance thanks to passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments.
• Superior hand-tightening capability provided by the knurled round head, allowing for secure installation and removal without tools.
• Enhanced load distribution and stability from the integrated flange design, which helps prevent surface damage and loosening under vibration.
• Precision fine threading (1/4"-28 UNF) with a Class 2B fit for smooth, reliable engagement and consistent clamping force.
• Durable and wear-resistant performance due to the fully threaded, right-hand design, suitable for repeated adjustments.
• Wide industrial compliance with REACH and RoHS 3 standards, making it safe for regulated applications.
• Convenient collar dimensions (15/32" diameter) offer a comfortable and secure grip for efficient manual operation.

Professional Applications & Engineering Value

This heavy-duty thumb nut is engineered to solve common assembly challenges in industrial settings where tool-free access and corrosion resistance are critical. The passivated 18-8 stainless steel material provides excellent protection against rust and chemical exposure, making it ideal for outdoor equipment, marine hardware, and food processing machinery. The flanged design increases the bearing surface, reducing point stress and preventing damage to softer materials. Combined with the knurled head texture, it ensures a firm grip even with greasy hands, speeding up maintenance and reducing downtime. The 1/4"-28 UNF fine thread offers superior vibration resistance compared to coarse threads, maintaining clamp load in dynamic applications. This nut delivers reliable, repeatable performance for panel fastening, adjustable fixtures, and access panels where quick disassembly is required.

Specification Summary & Compliance

This thumb nut features a 1/4"-28 UNF fine thread with a Class 2B thread fit for consistent engagement and precision. The threading is right-hand and fully threaded for maximum strength. Manufacturing adheres to standard UNF (Unified National Fine) specifications. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring it is free from hazardous substances for safe use in various industrial sectors.