S-98704A120 4-40 x 21/32" 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 manual operation with knurled round head and low-profile design for comfortable, slip-resistant grip during frequent adjustments
- Corrosion-resistant 18-8 stainless steel construction ensures long-term reliability in humid or demanding industrial environments
- Dual drive compatibility with thumb operation and 3/32" hex drive for flexible installation using tools or manual methods
- Precision Class 3A thread fit provides secure fastening with minimal backlash in critical assembly applications
- Temperature-resistant acetal plastic head maintains integrity across 32° to 180° F operating range
- Full threading along 21/32" length enables maximum adjustment range and holding power
- Regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This 4-40 UNC thumb screw combines the corrosion resistance of 18-8 stainless steel with the ergonomic benefits of a knurled round head for superior handling in industrial settings. The black finish provides additional protection while the acetal plastic head material ensures comfortable operation without compromising durability. Engineered with Class 3A thread fit and coarse UNC threading, this fastener delivers reliable performance in electronic enclosures, machinery access panels, and test equipment where frequent adjustments are required. The combination of thumb operation and hex drive compatibility makes it ideal for maintenance applications requiring both quick manual access and secure tool-assisted tightening.
Specification Summary & Compliance
This thumb screw features 4-40 UNC coarse threads with Class 3A fit for precision engagement, manufactured from 18-8 stainless steel with a protective black finish. The fastener is fully threaded along its 21/32" length with right-hand thread direction. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety standards are met for industrial applications.
