S-91882A423 1/4"-20 x 5/8" 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 manual grip and torque application with a 1" diameter knurled round head for slip-resistant operation without tools
- Superior corrosion resistance and durability thanks to the black-oxide steel finish, extending service life in demanding environments
- High mechanical strength and load-bearing capacity with 70,000 psi tensile strength and Rockwell B84 hardness for reliable performance
- Easy installation and precise fit with Class 2A thread fit and UNC coarse threads, ensuring compatibility and reduced cross-threading risks
- Full-length threading for maximum adjustability and secure fastening across the entire 5/8" length
- Compliance with international environmental standards including RoHS 3 and REACH, making it suitable for regulated industries
- Optimized for right-hand threading applications with a raised head profile for comfortable, repeated manual use
Professional Applications & Engineering Value
This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and tool-free operations in tight spaces. The knurled round head provides exceptional tactile grip, reducing hand fatigue and improving efficiency in assembly, maintenance, and prototyping tasks. With its UNC 1/4"-20 coarse thread and Class 2A fit, it ensures quick engagement and reliable holding power in machinery, electronic enclosures, and jig fixtures. The fully threaded design allows for versatile positioning, while the robust material and 70,000 psi tensile strength prevent stripping and deformation under stress, making it ideal for MRO, automotive, and OEM applications where durability and compliance are critical.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from black-oxide steel with a hardness of Rockwell B84 and tensile strength of 70,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006), ensuring it meets stringent environmental and safety regulations for industrial use.
