S-99607A109 4-40 x 7/16" 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 and torque application thanks to the knurled round head design, eliminating the need for tools in frequent adjustments
- Excellent corrosion resistance and durability provided by 18-8 Stainless Steel construction, ideal for harsh industrial environments
- High mechanical strength and load-bearing capability with 80,000 PSI tensile strength and Rockwell B85 hardness for reliable, long-term performance
- Easy and secure installation enabled by the fully threaded UNC coarse thread and Class 2A fit, ensuring consistent engagement and vibration resistance
- Enhanced stability and alignment from the flared collar design, preventing over-tightening and improving component positioning
- Broad compatibility with standard UNC components due to the 4-40 thread size and right-hand thread direction, simplifying sourcing and assembly
- Safe for regulated industries with full compliance to RoHS 3 and REACH environmental standards
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers critical performance in applications requiring frequent manual access and secure fastening. The 18-8 Stainless Steel material ensures reliable operation in moist or corrosive settings, from electronic enclosures to machinery panels, without compromising structural integrity. The fully threaded design and coarse UNC thread provide rapid installation and high pull-out strength, reducing assembly time while resisting loosening under vibration. The knurled head offers a non-slip surface for operators, even with gloves, enhancing safety and efficiency in maintenance-heavy environments. Its flared collar adds stability, distributing load evenly and protecting sensitive surfaces from damage during tightening.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. Manufacturing specifications include a thread size of 4-40, fully threaded length of 7/16", and a knurled round head for manual operation. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.
