--- title: "Choosing a Shaft Grounding Ring: Part 3" description: The uKIT - an AEGIS Shaft Grounding Ring with universal mounting brackets - is the easiest type of SGR to choose and install. image: https://blog.est-aegis.com/hubfs/uKIT-Split.jpg --- [![Electro Static Technology](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/electro-static-technology.svg "Electro Static Technology")](https://www.est-aegis.com/) [![Aegis](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/Aegis.svg "Aegis")](https://www.est-aegis.com/) - [+1 866-738-1857](tel:+1%20866-738-1857) - [Products](https://www.est-aegis.com/products/) - [AEGIS® SGR – for motors under 500 HP/375 kW](https://www.est-aegis.com/product/sgr/) - [AEGIS® uKIT – for common NEMA/IEC frame size](https://www.est-aegis.com/product/sgr-ukit/) - [AEGIS® RPPR – for reactor recirculating pumps](https://www.est-aegis.com/rppr-resources/) - [AEGIS® EV and EVO Rings - for electric vehicles](https://www.est-aegis.com/product/ev-evo-rings/) - 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Part 3 [AEGIS](https://blog.est-aegis.com/author/estaegis) Apr 4, 2023 So far, we have covered [clamp-on and conductive epoxy mounting](https://blog.est-aegis.com/how-to-choose-an-aegis-ring-part-1?hsLang=en-us) for external installation and bolt-through and press-fit mounting for installing an AEGIS ring inside a motor.  This time, we will cover our universal mounting kits. ![family](https://blog.est-aegis.com/hs-fs/hubfs/family.jpg?width=1000&height=346&name=family.jpg) ## When to Choose the AEGIS uKit The fifth and most popular style of [AEGIS ring is the uKIT](https://www.est-aegis.com/product/sgr-ukit/), which is available in solid and split builds. uKITs include a grounding ring and four different sets of mounting brackets.  Those brackets allow you to position the SGR at the working diameter of the shaft. (The working diameter is the U dimension for NEMA frame motors, or D dimension for IEC frame.)![uKIT-Split](https://blog.est-aegis.com/hs-fs/hubfs/uKIT-Split.jpg?width=300&height=300&name=uKIT-Split.jpg) That means that all you need to know to choose a uKIT is the motor's frame size. There's no need to measure the shaft if it's wider than the working diameter where the ring would sit. This makes it much easier to size a uKIT than one of the other mounting styles. AEGIS uKITs are available for NEMA frame sizes from 56 to 449T, and IEC frames 100L to to 355M. The mounting brackets themselves can be attached with bolts, requiring a drill and tap, or with conductive epoxy (EP2400). A split uKIT with conductive epoxy is arguably the easiest AEGIS ring to install. ![epoxy-ukit-1](https://blog.est-aegis.com/hs-fs/hubfs/epoxy-ukit-1.jpg?width=600&height=319&name=epoxy-ukit-1.jpg) There are only a few cases where a uKIT wouldn't work. Close-coupled pump motors (NEMA frames ending JM or JP) may not have room for a uKIT with mounting brackets between the motor and pump.  In this case, you would want a clamp-on or bolt-through ring, either at the drive end or the opposite end (between the motor frame and the cooling fan). ![o-ring](https://blog.est-aegis.com/hs-fs/hubfs/o-ring.png?width=300&height=180&name=o-ring.png) And uKITs can't be installed inside the motor, as they are sized for the working diameter of the shaft, not the internal diameter.  So in very wet or dirty environments, you would prefer to install a bolt-through SGR inside the motor, rather than a uKIT outside. This can be mitigated somewhat by sliding an O ring up the shaft to guard the fibers, as shown.   AEGIS Shaft Grounding Rings also have a [2-year extended warranty](https://www.est-aegis.com/product/extended-warranty/) against bearing fluting damage. No other form of shaft grounding offers a warranty like this. [![2-Year Extended Warranty](https://no-cache.hubspot.com/cta/default/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/3b258d08-3058-4c7f-a866-2991b627f2e0) To learn more about AEGIS shaft grounding and best practices for electrical bearing protection - for motors and generators - [sign up for a training](https://www.est-aegis.com/resources/training/). We offer monthly live training webinars, and we can also visit your facility to review your exact application. [![Sign Up For Training](https://no-cache.hubspot.com/cta/default/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0.png)](https://cta-redirect.hubspot.com/cta/redirect/20974229/69dd56c7-bbd1-4ad0-ae5c-29de322039f0) [How-To](https://blog.est-aegis.com/tag/how-to), [Conductive Epoxy Mounting](https://blog.est-aegis.com/tag/conductive-epoxy-mounting), [uKIT](https://blog.est-aegis.com/tag/ukit), [Motor Frame Size](https://blog.est-aegis.com/tag/motor-frame-size) ### Subscribe To Our Blog ## Read On ### [The AEGIS Online Catalog and Product Selector](https://blog.est-aegis.com/the-aegis-online-catalog-and-product-selector?hsLang=en-us) We are excited to announce the new AEGIS® online catalog. You can easily locate the part you need,... ### [How To: Bearing Protection Handbook Details Best Practices For Motor Protection and Repair](https://blog.est-aegis.com/how-to-bearing-protection-handbook-details-best-practices-for-motor-repairs?hsLang=en-us) This 56-page technical handbook describes best practices for protecting motor bearings from... ### [Swimming Pool Pumps and AEGIS Shaft Grounding](https://blog.est-aegis.com/swimming-pool-pumps-vfd-bearing-protection-aegis-ring?hsLang=en-us) Around this time every year, people around the Northern Hemisphere remember what a wonderful... 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