S-91746A421 1/4"-20 x 1/2" 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
- Enhanced grip and torque application with knurled head texture for secure manual tightening without tools
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable load-bearing performance
- Quick installation and adjustment through UNC coarse threading and right-hand direction for standard assembly procedures
- Space-saving low-profile design with round head shape for applications with limited clearance
- Precision thread engagement ensured by Class 2A thread fit, reducing cross-threading risks
- Environmental regulation compliance meeting RoHS 3 and REACH standards for safe usage in regulated industries
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this low profile thumb screw combines the durability of 18-8 stainless steel with practical design features that address common assembly challenges. The knurled head provides exceptional manual grip even with oily hands or gloves, eliminating the need for tools in frequent adjustment applications. Its UNC coarse threading and partial threading design enable rapid installation in machinery panels, electronic enclosures, and equipment access points where repeated access is required. The right-hand thread direction follows industry standards for intuitive operation, while the corrosion-resistant material ensures long-term reliability in manufacturing, automotive, and outdoor applications where moisture and chemicals are present.
Specification Summary & Compliance
This thumb screw features precision 1/4"-20 UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. The fastener measures 1/2" in total length with 7/16" threaded portion and 3/4" head diameter. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restriction of hazardous substances. The 18-8 stainless steel construction provides mechanical properties including 80,000 psi tensile strength and Rockwell B83 hardness for reliable performance in industrial fastening applications.
