S-99607A214 4-40 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Easy Handling: Knurled round head with flared collar design provides superior manual tightening and loosening without tools, reducing assembly time.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel, offering reliable performance in humid or corrosive industrial environments.
• High Strength and Durability: With a tensile strength of 80,000 psi and Rockwell B85 hardness, it withstands heavy-duty applications and repeated use.
• Precise Thread Fit for Secure Fastening: Class 2A thread fit ensures consistent engagement and vibration resistance in UNC coarse threaded assemblies.
• Full Threading for Maximum Engagement: Fully threaded 3/4" length allows for adjustable depth and secure holding across various material thicknesses.
• Compliance with Environmental Standards: RoHS 3 and REACH compliant, ensuring safe use in regulated industries and global markets.
• Wide Industrial Compatibility: 4-40 UNC coarse thread spacing is ideal for quick assembly in electronics, machinery, and equipment panels.

Professional Applications & Engineering Value

This 4-40 UNC thumb screw is engineered to address common industrial challenges such as frequent adjustments and exposure to harsh conditions. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for outdoor equipment, marine applications, and chemical processing units where moisture and chemicals are present. The knurled round head with a flared collar offers a secure grip, enabling quick manual operations in tight spaces—ideal for access panels, electronic enclosures, and prototyping setups. Its coarse thread spacing and fully threaded design ensure fast installation and reliable holding power, reducing the risk of stripping in soft materials. By combining high tensile strength and precise Class 2A thread fit, this screw minimizes loosening from vibrations, enhancing safety and longevity in dynamic industrial environments.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufacturing specifications include a thread size of 4-40, coarse spacing, and full threading over a 3/4" length, providing reliable performance in accordance with industrial fastening requirements.