S-91185A422 1/4"-20 x 1 1/2" 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
- Enhanced grip and comfort with knurled acetal plastic head for secure hand-tightening without tools
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for demanding environments
- Precise thread engagement with UNC Class 3A coarse threads ensuring reliable fastening in various materials
- Space-saving low-profile design allowing installation in tight clearance applications
- Wide temperature tolerance (32° to 180°F) for stable performance across diverse operating conditions
- Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial use
- Optimized partial threading providing controlled engagement depth for consistent assembly results
Professional Applications & Engineering Value
This low-profile thumb screw combines the durability of 18-8 stainless steel with the ergonomic advantages of a knurled acetal plastic head, addressing critical assembly challenges in industrial settings. The coarse UNC 1/4"-20 threading delivers rapid installation in soft materials and plastics where fine threads might strip, while the Class 3A thread fit maintains precise tolerances for vibration-resistant connections. The partially threaded design prevents over-tightening in depth-sensitive applications, making it ideal for electronic enclosures, machinery access panels, and laboratory equipment requiring frequent adjustments. The corrosion-resistant properties ensure long-term reliability in humid or chemically exposed environments, reducing maintenance cycles and replacement costs.
Specification Summary & Compliance
Manufactured to exacting standards with UNC Class 3A thread specifications for superior dimensional accuracy. Features a 3/4" diameter knurled head with 5/16" height low-profile configuration and 1" minimum thread length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global markets. The right-hand coarse threading follows industry-standard UNC specifications for broad compatibility with existing components and tooling.
