S-99607A184 1/4"-20 x 3/8" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior grip and torque application with 37/64" knurled head for secure manual tightening without tools
- Excellent corrosion resistance thanks to 18-8 stainless steel construction for long service life in harsh environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance under load
- Precise thread engagement with UNC coarse thread and Class 2A fit ensuring consistent fastening in industrial applications
- Full-length threading provides maximum holding power along the entire 3/8" length
- Flared collar design offers improved bearing surface and prevents over-tightening
- Environmental compliance with RoHS 3 and REACH regulations for safe use across regulated industries
Professional Applications & Engineering Value
This 1/4"-20 thumb screw delivers exceptional value in applications requiring frequent adjustments or tool-less operation. The 18-8 stainless steel construction provides superior corrosion resistance, making it ideal for industrial environments where moisture, chemicals, or outdoor exposure are concerns. The knurled head texture ensures positive grip even with gloved hands, while the UNC coarse thread pattern enables quick installation and removal. The flared collar design distributes clamping force evenly, preventing damage to sensitive components. These thumb screws are particularly valuable in electronic enclosures, machine access panels, and maintenance-heavy equipment where rapid disassembly is required without compromising fastening reliability or mechanical integrity.
Specification Summary & Compliance
This thumb screw features precise Class 2A thread fit with UNC 1/4"-20 coarse threading and right-hand direction. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fully threaded design maintains consistent thread engagement throughout the 3/8" length, while the 37/64" head diameter and 1/4" head height provide optimal manual operation. The flared collar measures 31/64" in diameter with 1/8" height, enhancing stability during tightening operations.
