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OE Quality
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SKF
Inner Wheel Bearing-Rear WheelSKF SET421 Wheel Bearing - Inner
| Brand | SKF SET421 |
|---|---|
| Position | Inner |
| Inside Diameter | 3.250 |
| Width | 1.562 |
| Outside Diameter | 5.250 |
| Product line | Inner Wheel Bearing-Rear Wheel |
| Fits | Mack · 142 vehicles |
Tapered roller design. Provides smooth wheel-end rotation with consistent load handling.
Precision raceway finish. Helps reduce noise and supports quiet operation.
Heavy-duty application. Built for demanding commercial truck wheel-end service.
Cross-references Bosch 16488, 1458HM516410 and 9759HM516410 for the same application. See all 10.
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Overview
SKF SET421 is an inner wheel bearing for heavy-duty rear wheel applications that require tapered roller bearing construction. It is built for Mack trucks across a broad range of model years and supports smooth, quiet operation with a precision roller raceway profile and fine surface finish.
Compatible With Mack CHU, CXU, GU7, GU8, MRU, and related models in inner rear wheel bearing applications. The SET421 part number is used for fitment verification, and SKF SET421 is also referenced by cross-number applications for the same use case.
Key Features
- Tapered roller bearing set construction for wheel-end service.
- Logarithmic roller raceway profile for consistent rolling contact.
- Ultra-smooth surface finish for reduced operating noise.
- Dimensions: 3.250 in inside diameter, 5.250 in outside diameter, 1.562 in width.
- Fits Mack heavy-duty trucks with S440 GAWR 44k lb rear wheel inner bearing applications.
Detailed Description
SKF SET421 is engineered as an inner wheel bearing for rear wheel service on Mack commercial trucks. Fitment includes 1998-2018 Mack CHU, CXU, GU7, GU8, LR600, MRU, TerraPro, Granite, TD700, Vision, CTP, CV, CL, CT, CXN, CXP, MR, DM, CX, and DMM applications with S440 GAWR 44k lb notes. The bearing set uses tapered roller geometry to handle wheel-end loads while maintaining smooth rotation. SKF SET421 is a direct reference for buyers searching by part number or by Mack wheel bearing fitment.
This part cross-references Bosch 16488 for the same application.
What It Is Used For
- Replacing a worn inner wheel bearing in rear wheel service.
- Addressing wheel-end noise during operation.
- Restoring proper rolling support in heavy-duty axle assemblies.
- Correcting looseness or roughness at the wheel end.
Installation Notes and Tips
Verify axle and hub specifications against the listed fitment notes before installation. Confirm the bearing dimensions and application details match the existing component, especially on Mack trucks with S440 GAWR 44k lb rear wheel inner bearing requirements. Clean and inspect the hub and related surfaces during service to help ensure proper bearing seating.
Quality Assurance
SKF states that its products are manufactured to high quality standards for long service life and safety. The SET421 bearing set is part of SKF's tapered roller bearing line, which is used across a wide range of applications.
This part fits 142 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2018 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | LR600 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2018 | Mack | TerraPro | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | Granite | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | Granite 8 X 4 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | LR600 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | TerraPro | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2017 | Mack | Vision | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | Granite | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | Granite 8 X 4 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | LR600 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | TerraPro | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2016 | Mack | Vision | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | Granite | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | Granite 8 X 4 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | TerraPro | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2015 | Mack | Vision | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2014 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2013 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2012 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2011 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2010 | Mack | TD700 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2009 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2009 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2009 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2009 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2009 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | CHU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | CTP | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | CXU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | GU7 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | GU8 | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2008 | Mack | MRU | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CT | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CTP | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CXN | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | CXP | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2007 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CT | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CTP | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CXN | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | CXP | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2006 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | CT | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | CXN | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2005 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | CXN | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2004 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2003 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2002 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | CV | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2001 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2000 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2000 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2000 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2000 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 2000 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1999 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1999 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1999 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1999 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1999 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1998 | Mack | CL | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1998 | Mack | CX | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1998 | Mack | DM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1998 | Mack | DMM | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| 1998 | Mack | MR | Inner | S440 GAWR 44k lb; Inner Wheel Bearing-Rear Wheel |
| No rows match your filter. | ||||
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 164881458HM5164109759HM51641036506J174695H11813454570645609632150184SBN HM516410SKF