S-98704A130 4-40 x 29/32" 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 acetal plastic head for superior grip and tool-free adjustments
- Reliable corrosion resistance from 18-8 stainless steel construction, ideal for demanding environments
- Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Broad temperature compatibility with head operating range from 32° to 180° F for versatile applications
- Quick installation facilitated by coarse UNC threads and partial threading up to 3/4" minimum length
- Low-profile round head design minimizes protrusion while providing comfortable thumb pressure surface
- Regulatory compliance meeting RoHS 3 and REACH standards for safe industrial use
Professional Applications & Engineering Value
This 4-40 UNC thumb screw combines the durability of 18-8 stainless steel with the ergonomic advantage of a knurled acetal plastic head, addressing critical needs in industrial assembly and maintenance. The black finish provides additional corrosion protection while the coarse thread design enables rapid installation in equipment panels, electronic enclosures, and machinery access points. Engineers value the Class 3A thread fit for maintaining tight tolerances in vibration-prone environments, while the low-profile round head ensures clearance in space-constrained applications. The partial threading allows for optimal grip length selection, making these thumb screws ideal for frequent adjustment points in manufacturing fixtures, test equipment, and industrial controls where tool-less operation is essential.
Specification Summary & Compliance
This thumb screw features 4-40 UNC coarse threads with Class 3A precision fit and right-hand thread direction. The assembly combines an 18-8 stainless steel body with acetal plastic head measuring 5/16" diameter with knurled texture. Minimum thread length is 3/4" with partial threading configuration. Product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for regulated industrial applications.
