S-91833A138 1/4"-20 Thumb Nuts
Thumb Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
Geometric Parameters
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Key Features & Benefits at a Glance
- Superior hand-tightening capability with deep knurling for secure grip even with gloves or oily hands
- Excellent corrosion resistance thanks to 18-8 stainless steel construction for long-term reliability in harsh environments
- Precise thread engagement with Class 2B fit ensuring smooth installation and consistent performance
- Tool-free assembly and disassembly with right-hand coarse threading for rapid maintenance and adjustments
- Optimized load distribution from the 1/2" collar diameter providing stable fastening under vibration
- Regulatory compliance assurance meeting both RoHS 3 and REACH standards for safe industrial use
- Versatile partial threading design allowing for adjustable positioning while maintaining thread integrity
Professional Applications & Engineering Value
This 18-8 stainless steel thumb nut delivers exceptional value in applications requiring frequent access or tool-free operation. The deep knurled texture provides positive grip in challenging conditions where gloves are necessary or when contaminants are present. Engineered with UNC coarse threading and Class 2B thread fit, it ensures reliable engagement while resisting cross-threading during manual installation. The partially threaded design combined with the substantial 1" head diameter offers excellent leverage for hand-tightening operations. Ideal for industrial equipment panels, access covers, and machinery requiring regular maintenance, this corrosion-resistant thumb nut eliminates the need for specialized tools while maintaining secure fastening in vibration-prone environments.
Specification Summary & Compliance
This thumb nut features 1/4"-20 UNC coarse threading with Class 2B thread fit for standard industrial applications. The partially threaded design provides 1/2" of thread depth with right-hand direction. Manufacturing complies with industry standards for dimensional accuracy, including the specified 1/2" collar diameter and 1" total height. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use across multiple sectors.
