S-99607A238 1/4"-28 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Superior manual operation with knurled round head and flared collar design for enhanced grip and tool-free tightening
• Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-lasting performance
• Precise thread engagement with Class 2A fit and UNF fine threads ensuring secure, vibration-resistant fastening
• Full threading capability providing maximum thread contact and consistent clamping force along the entire 3/8" length
• Regulatory compliance meeting RoHS 3 and REACH standards for environmentally conscious manufacturing operations
• Optimized dimensions with 37/64" head diameter and flared collar design for comfortable handling and improved torque application

Professional Applications & Engineering Value

This 1/4"-28 UNF thumb screw delivers exceptional engineering value in applications requiring frequent access or adjustment, such as electrical enclosures, machinery guards, and access panels. The 18-8 stainless steel construction provides superior corrosion resistance, eliminating rust concerns in humid or chemical-exposed environments. The knurled head texture combined with the flared collar design ensures positive grip even with gloved hands, solving the common industrial problem of slippage during manual operation. The fully threaded configuration and UNF fine thread pattern maintain consistent clamping pressure while resisting vibration-induced loosening. These features make this thumb screw particularly valuable for maintenance-intensive equipment where quick, reliable fastening is essential for operational efficiency and safety compliance.

Specification Summary & Compliance

This thumb screw features precision Class 2A thread fit with 1/4"-28 UNF fine threads and right-hand thread direction, manufactured to standard inch system specifications. The product maintains dimensional accuracy with 0.25" thread diameter and 3/8" length for consistent performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met for industrial applications.