S-90790A175 1/4"-20 Cap Nuts
Cap Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Enhanced corrosion resistance with black-oxide steel coating for prolonged service life in harsh industrial environments
- Superior load distribution due to extra-wide high profile design, reducing surface pressure and material stress
- Reliable coarse thread engagement with UNC 1/4"-20 and Class 2B fit for quick assembly and vibration resistance
- Secure external hex drive enabling high-torque installation with standard tools for efficient maintenance
- Robust 5/8" height and width providing substantial thread depth (3/8") for strong, deep fastening connections
- Compliance with environmental standards including REACH and RoHS 3, ensuring safe use in regulated industries
- Right-hand thread direction for intuitive installation compatible with common assembly practices
Professional Applications & Engineering Value
This black-oxide steel cap nut delivers critical performance in demanding applications where corrosion resistance and structural integrity are paramount. The extra-wide high profile design significantly increases bearing surface area, preventing pull-through in soft materials and distributing clamp load evenly to minimize fatigue failure. Its UNC coarse threads and Class 2B fit ensure rapid installation with reduced cross-threading risks, while the external hex drive accommodates high torque requirements in machinery, automotive, and construction assemblies. Engineered for heavy-duty industrial fastening, it solves common issues of loosening under vibration and exposure to moisture or chemicals.
Specification Summary & Compliance
This cap nut adheres to UNC 1/4"-20 coarse thread specifications with Class 2B thread fit for consistent dimensional accuracy. It meets REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) compliance standards, including exemption 6(a)-I for lead as an alloying element in steel. Manufacturing follows inch system measurements with precise 5/8" width and height and 3/8" thread depth, ensuring reliable performance in industrial fastener applications.
