S-98816A256 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
- Easy hand-tightening without tools thanks to the knurled round head and raised profile for superior grip in tight spaces.
- Exceptional durability and corrosion resistance from high-strength brass construction, ideal for demanding environments.
- Reliable and quick assembly with coarse UNC threads and Class 2A fit, ensuring consistent engagement and vibration resistance.
- High mechanical strength with a Rockwell B78 hardness and 50,000 psi tensile strength for heavy-duty applications.
- Secure and stable fastening provided by the integrated collar, which helps distribute load and prevent over-tightening.
- Wide industrial compatibility due to standard 1/4"-20 thread size and right-hand thread direction.
- Safe for regulated industries with RoHS 3 compliance, meeting environmental and safety standards for lead content in copper alloys.
Professional Applications & Engineering Value
This brass thumb screw is engineered to solve common industrial challenges such as frequent adjustments and tool-free access in confined areas. The knurled head and raised profile deliver maximum torque by hand, reducing installation time and eliminating the need for specialized tools. Made from high-strength brass, it offers excellent corrosion resistance and longevity in harsh conditions, from electrical enclosures to machinery covers. The 1/4"-20 UNC coarse threads and fully threaded 1/2" length ensure rapid, secure fastening, while the Class 2A thread fit maintains precision for repeated use without cross-threading. Ideal for industrial and commercial equipment requiring reliable, reusable fasteners.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured with a 1/4"-20 thread size, 1/2" length, and 5/8" head diameter. The product is RoHS 3 (2015/863/EU) compliant under exemption 6(c) for lead in copper alloys, ensuring it meets environmental regulations for industrial use.
