S-91746A963 8-40 x 1/2" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Effortless hand-tightening and adjustment with a knurled round head and slotted drive for superior grip in tight spaces
- Exceptional corrosion resistance due to 18-8 Stainless Steel construction, ensuring long-term reliability in harsh environments
- High mechanical strength and durability with an 80,000 psi tensile strength and Rockwell B83 hardness for demanding applications
- Precise and secure fastening achieved with an 8-40 extra fine thread and Class 2A fit, minimizing the risk of loosening under vibration
- Full-length threading provides maximum engagement and holding power along the entire 1/2" length
- Compliance with major environmental regulations, including RoHS 3 and REACH, for safe and responsible use in global markets
- Narrow round-head profile allows for use in confined areas where standard tool access is limited
Professional Applications & Engineering Value
This 18-8 Stainless Steel Thumb Screw is engineered to solve common industrial challenges, such as the need for frequent, tool-free adjustments in electronic enclosures, instrumentation panels, and precision machinery. The extra fine 8-40 thread and Class 2A fit deliver superior vibration resistance and precise alignment, critical for maintaining calibration in sensitive equipment. The fully threaded design ensures consistent clamping force, while the knurled head texture provides a non-slip grip, even with gloved hands. Its corrosion-resistant properties make it ideal for use in medical devices, laboratory equipment, and outdoor applications, reducing maintenance costs and enhancing operational lifespan.
Specification Summary & Compliance
This thumb screw adheres to UNS (Unified National Special) thread standards with an 8-40 extra fine thread and a Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 Stainless Steel and is fully threaded with a length of 1/2". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial components.
