S-91882A219 4-40 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
- Enhanced grip and torque application with knurled round head design for easy manual tightening and loosening without tools
- Superior corrosion resistance and durability thanks to black-oxide steel construction, extending service life in harsh environments
- High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibration
- Precise Class 2A thread fit provides smooth engagement and consistent performance in UNC coarse thread applications
- Fully threaded shank design allows for maximum adjustability and secure holding across the entire length
- Rockwell B84 hardness rating offers excellent wear resistance and maintains thread integrity over repeated use
- Compliance with RoHS 3 and REACH regulations ensures safe, environmentally responsible use in global industrial markets
Professional Applications & Engineering Value
This 4-40 UNC thumb screw is engineered to address common industrial fastening challenges, such as frequent adjustments and exposure to corrosive conditions. The black-oxide steel material provides a protective layer that reduces rust and wear, ideal for machinery, electronic enclosures, and assembly jigs where durability is critical. The knurled round head with raised profile ensures a firm, slip-resistant grip, enabling quick manual operation without specialized tools—saving time in maintenance and production lines. With its coarse thread spacing and fully threaded design, it offers rapid installation and reliable clamping force, making it a versatile solution for industrial thumb screw applications requiring both strength and ease of use.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and compatibility. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant, ensuring it aligns with international environmental and safety regulations for industrial components.
