S-91185A237 4-40 x 3/8" 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: Knurled Acetal plastic head ensures secure, non-slip handling during manual adjustments, reducing operator fatigue.
- Superior Corrosion Resistance: 18-8 Stainless Steel construction provides excellent durability in humid or mildly corrosive environments.
- Precise Thread Engagement: Class 3A thread fit offers tighter tolerances for reliable, vibration-resistant fastening in critical assemblies.
- Wide Temperature Compatibility: Operates effectively from 32° to 180°F, suitable for various indoor and controlled industrial settings.
- Low-Profile Design: Round, low-profile head minimizes protrusion, ideal for space-constrained applications.
- Quick Installation: Fully threaded 4-40 UNC coarse thread enables fast assembly and disassembly without specialized tools.
- Environmental Compliance: Meets RoHS 3 and REACH standards, ensuring safe use in regulated industries and global markets.
Professional Applications & Engineering Value
This 4-40 UNC thumb screw combines the strength of 18-8 Stainless Steel with the ergonomic advantages of an Acetal plastic knurled head, addressing common challenges in industrial maintenance and electronics assembly. The Class 3A thread ensures precise alignment and secure holds in equipment panels, access doors, and calibration devices, reducing the risk of loosening under vibration. The low-profile round head design prevents snagging in tight spaces, while the coarse thread facilitates rapid adjustments without cross-threading. Ideal for applications requiring frequent access, such as server racks, medical devices, and instrumentation, this screw enhances operational efficiency and user safety in temperature-controlled environments.
Specification Summary & Compliance
This thumb screw features a 4-40 UNC coarse thread with Class 3A fit for high precision, fully threaded along a 3/8" length. It adheres to standardized inch measurements and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
