S-98704A710 1/4"-28 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a knurled acetal plastic head for secure grip in high-vibration environments
• Precise thread engagement due to Class 3A fine thread fit, reducing the risk of cross-threading in assembly
• Corrosion-resistant performance from 18-8 stainless steel construction, ideal for harsh industrial settings
• Space-saving low-profile design allows installation in tight or restricted-access applications
• Dual-drive versatility with both thumb-operated head and 3/16" hex drive for torque application flexibility
• Reliable temperature tolerance from 32° to 180°F, maintaining integrity across various operating conditions
• Full-threaded shank ensures consistent clamping force distribution along the entire fastener length

Professional Applications & Engineering Value

This low-profile thumb screw combines 18-8 stainless steel durability with a knurled acetal plastic head to solve common assembly challenges. The 1/4"-28 UNF fine threading and Class 3A thread fit provide superior resistance to vibrational loosening in machinery, electronic enclosures, and precision instruments. The fully threaded design ensures maximum thread contact in thin materials, while the temperature-resistant acetal head remains functional in environments ranging from freezing to moderate heat. Engineers specify this thumb screw for applications requiring frequent adjustments without tools, where corrosion resistance and consistent clamping force are critical.

Specification Summary & Compliance

Manufactured to precise Class 3A thread tolerances with 1/4"-28 UNF fine threading and full thread engagement. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in industrial and electronic applications worldwide.