S-91830A573 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
- Superior grip and handling with knurled texture on the round head for secure manual tightening in high-vibration environments
- Excellent corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial or outdoor settings
- High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable, repeated use
- Easy, quick installation thanks to UNC coarse threading and Class 2A thread fit, reducing assembly time
- Full-thread engagement along the 5/8" length ensures maximum holding power and alignment
- Enhanced stability from the raised round head profile and integrated collar for better load distribution
- Environmental and regulatory compliance with RoHS 3 and REACH, safe for various global applications
Professional Applications & Engineering Value
This 1/4"-20 knurled thumb screw is engineered to address common industrial fastening challenges where tool-free adjustment and robust performance are critical. The 18-8 stainless steel material offers inherent corrosion resistance, making it suitable for machinery, electronics enclosures, and outdoor equipment exposed to moisture or chemicals. The knurled head texture and raised round-head design provide an ergonomic, non-slip surface for operators, even when wearing gloves. With UNC coarse threading and a fully threaded shank, it ensures rapid installation and secure retention in wood, metal, or plastic components, reducing downtime in assembly lines and maintenance tasks. Its high tensile strength and Class 2A thread fit guarantee consistent performance in vibration-prone applications, from manufacturing jigs to automotive fixtures.
Specification Summary & Compliance
This thumb screw features a 1/4"-20 UNC coarse thread with Class 2A fit for standard tolerance and compatibility. It is manufactured from 18-8 stainless steel with a hardness of Rockwell B83 and tensile strength of 80,000 psi. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets strict environmental and safety regulations for industrial use.
