S-91882A451 3/8"-16 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
- Superior manual grip with a large 1-3/8" knurled head for easy, tool-free tightening and loosening in tight spaces
- Enhanced durability and corrosion resistance thanks to the black-oxide steel finish, extending service life in industrial environments
- High tensile strength of 70,000 psi ensures reliable fastening under significant load and vibration
- Precise coarse UNC threading (Class 2A) provides quick assembly and secure holding power
- Fully threaded design allows for maximum adjustability and consistent engagement along the entire 5/8" length
- Raised round-head profile offers comfortable finger pressure distribution during repeated manual use
- Compliance with RoHS 3 and REACH regulations guarantees safe, environmentally responsible use in global markets
Professional Applications & Engineering Value
This heavy-duty thumb screw is engineered to solve common industrial fastening challenges where tools are impractical or speed is critical. The black-oxide steel construction resists rust and wear, making it ideal for machinery panels, electrical enclosures, and assembly jigs exposed to oils or moisture. Its 3/8"-16 UNC coarse thread and Class 2A fit enable rapid installation with minimal cross-threading risk, while the knurled head ensures a firm grip even with greasy gloves. With a Rockwell B84 hardness and 70,000 psi tensile strength, it withstands repetitive adjustments and high-stress applications, reducing maintenance downtime and improving operational efficiency in manufacturing, automotive, and electronics sectors.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A tolerance for consistent fit. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I and is REACH (EC 1907/2006) compliant, ensuring it is free from hazardous substances. Dimensions include a 1-3/8" head diameter, 5/8" length, and 3/4" collar diameter, all manufactured to precise industrial specifications for reliable performance.
