S-99607A244 1/4"-28 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 corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional grip and torque application thanks to the fully knurled round head design, eliminating the need for tools
- High-strength performance with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-lasting fastening
- Precise and secure thread engagement ensured by the Class 2A fit and 1/4"-28 UNF fine thread specification
- Flared collar design provides increased bearing surface for enhanced load distribution and reduced material stress
- Full threading along the 5/8" length offers maximum adjustability and holding power in a wide range of material thicknesses
- Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and global market acceptance
Professional Applications & Engineering Value
This 18-8 stainless steel thumb screw is engineered to solve critical challenges in industrial assembly and maintenance. The fully threaded body and Class 2A UNF fine thread provide vibration resistance and precise clamping force in applications like access panels, machine guards, and electronic enclosures. The knurled head offers a non-slip grip, even with greasy hands or when wearing gloves, speeding up installation and removal without stripping. The flared collar design prevents over-insertion and distributes load effectively, protecting softer materials from damage. Its high tensile strength and corrosion resistance make it a durable, low-maintenance fastening solution for OEM and MRO needs across various sectors.
Specification Summary & Compliance
This thumb screw adheres to the UNF (Unified National Fine) thread standard with a Class 2A thread fit for consistent, reliable performance. Key dimensional specifications include a 1/4"-28 thread size, 5/8" length, and a 37/64" head diameter. The product is manufactured to be fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for global industrial use.
