Diyuk 2 X M20 Hex Coupling Nuts - Threaded Rod Connector Studding Extension - Bzp Steel Class 6 - Din 6334

* PROFESSIONAL DIN 6334 COMPLIANCE - Precision-engineered to strict DIN 6334 standards, ensuring the nut’s length is exactly three times its nominal diameter . This specific ratio guarantees full thread engagement and maximum load-bearing capability, making them the industry standard for securely extending and joining metric threaded rods (studding) and studs. * HIGH-STRENGTH CLASS 6 STEEL - Constructed from durable carbon steel achieving a minimum Class 6 strength rating, designed for reliable load transfer in demanding structural frameworks. The fasteners are finished with Bright Zinc Plating (BZP), providing essential corrosion protection for indoor applications and dry environments (C1/C2 classifications). * INTEGRATED SAFETY WITNESS HOLE - Unlike standard coupling nuts, these feature a dedicated inspection port (witness hole). This allows installers to visually confirm that threaded rods are seated equally from both ends, ensuring balanced, safe thread engagement and preventing uneven stress distribution during installation. * VERSATILE APPLICATION & ALIGNMENT - Essential for extending rod lengths in HVAC, electrical installations, and suspended ceiling systems. Due to their precise geometric manufacturing, they also function excellently as rigid stand-offs or spacers for component alignment in heavy machinery and adjustable furniture. * UNIVERSAL METRIC COMPATIBILITY - Features standard metric coarse pitch threads for seamless fit with all commercially available threaded rods and anchor bolts. Available in multiple pack sizes (from 2 to 100) and diameters ranging from M5 to M24, suiting both small DIY repairs and bulk industrial procurement.