S-98704A110 4-40 x 13/32" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced grip and comfortable manual operation with knurled acetal plastic head that reduces hand fatigue during frequent adjustments
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for humid or demanding industrial environments
- Precise thread engagement and reliable fastening with Class 3A thread fit ensuring minimal backlash and vibration resistance
- Quick installation and tool compatibility through 3/32" hex drive combined with easy-grip thumb design for versatile use
- Low-profile round head design prevents snagging and allows use in confined spaces without compromising accessibility
- Environmental regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
- Wide temperature tolerance with acetal plastic head maintaining performance from 32° to 180°F
Professional Applications & Engineering Value
This 4-40 UNC thumb screw combines the durability of 18-8 stainless steel with the ergonomic advantages of a knurled acetal plastic head to solve critical assembly challenges. The coarse UNC thread and Class 3A fit provide rapid installation with exceptional holding power in applications requiring frequent access or adjustment. The black finish offers additional corrosion protection while the low-profile round head design minimizes protrusion in electronic enclosures, instrumentation panels, and machinery guards. Engineers specify these thumb screws for maintenance-friendly designs where tool-less operation and reliable thread engagement are essential, particularly in aerospace, telecommunications, and industrial equipment requiring RoHS compliant components.
Specification Summary & Compliance
Manufactured to precise inch measurement standards with 4-40 UNC coarse threads and Class 3A thread fit for consistent dimensional accuracy. The fully threaded design ensures maximum engagement length of 13/32". Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, featuring right-hand thread direction and knurled head texture for optimal manual operation.
