S-99607A212 4-40 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior manual grip with knurled head texture for slip-resistant handling during frequent adjustments
• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable load-bearing
• Precision thread engagement through Class 2A UNC coarse threads ensuring consistent fastening performance
• Enhanced stability with flared collar design preventing over-tightening and improving alignment
• Full-threaded convenience allowing installation at any point along the 1/2" length
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for industrial applications requiring repeated manual adjustments, this 4-40 UNC thumb screw solves common operational challenges in electronics, machinery, and instrumentation. The 18-8 stainless steel composition provides inherent corrosion resistance, eliminating degradation in humid or chemical-exposed environments. The knurled round head with flared collar delivers maximum torque application without tools, while the coarse UNC threads enable rapid installation and removal. Ideal for access panels, calibration devices, and modular assemblies, this screw maintains structural integrity under vibration and load cycles thanks to its 80,000 psi tensile strength.

Specification Summary & Compliance

This fully threaded thumb screw maintains Class 2A thread fit tolerances per UNC standards with 4-40 coarse threading. Manufacturing adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring hazardous substance restrictions are met. Dimensional accuracy includes 1/2" length, 19/64" head diameter, and 15/64" collar diameter with right-hand thread orientation.