Keystone™

Vocational tractors routinely face rutted dirt roads, rocky terrain, and unpredictable jobsite conditions. Keystone is built with higher ground clearance, axle-forward and axle-back configurations, and off-road capability to tackle obstacles and prevent damage in demanding environments. This is a modal window. Beginning of dialog window. Escape will cancel and close the window. End of dialog window. A keystone is the foundation, the backbone of any operation, and the workhorse behind every workhorse. In the world of trucking, that principle has a new face and name. This is a modal window. Beginning of dialog window. Escape will cancel and close the window. End of dialog window. Rough terrain capabilities This is a modal window. Beginning of dialog window. Escape will cancel and close the window. End of dialog window. Maximum payload capacity This is a modal window. Beginning of dialog window. Escape will cancel and close the window. End of dialog window. Highway handling precision A reinforced structure resists corrosion and withstands the elements, delivering superior durability, enhanced safety protection, and long-lasting quality that ensures reliable performance for years to come. With 2x the impact resistance and 5x scratch resistance, the available ImpactShield windshield extends service life and can reduce total cost of ownership. Keystone is built on a battle-tested foundation that brings construction-grade strength and durability to handle extreme loads. Engineered specifically for maximum payload demands. Vocational tractors routinely face rutted dirt roads, rocky terrain, and unpredictable jobsite conditions. Keystone is built with higher ground clearance and rugged off-road capability to help operators tackle these obstacles and prevent damage across demanding work environments. This optional feature delivers precise handling on everything from icy highways to rutted dirt roads while reducing driver effort by 85%. Advanced suspension utilizes electronically controlled rear suspension with eight tuned airbags to provide the most stable ride on a Mack Truck, no matter how rough the terrain gets. Shorter bumper to back of cab and bumper to front axle from previous models improve handling and visibility. Utilizing radars and cameras, Mack Protect alerts the driver to potential road hazards and intervenes with braking, engine control, and even corrective steering to guide drivers back into proper lane position when drifting is detected. The optional DMS combines dual camera wings and interior high-resolution digital displays to provide clear, real-time views that replicate traditional mirrors for enhanced visibility and safety. Navigate cities and jobsites safely with optional radar technology that detects and alerts for vulnerable road users like pedestrians, motorcyclists, and cyclists. Powering the all-new Keystone™ is our latest integrated powertrain. See what makes the 2027 MP®13 engine and mDRIVE™ transmission more powerful and fuel efficient than ever. Your single source for performance data, location tracking, operational analytics, and diagnostic insights, Mack Connect provides a unified dashboard designed to simplify your operations and drive profitability. Included for five years with purchase, the MyMack App gives you access to your truck and the ability to view multiple vehicle status levels. Automatic, proactive, over-the-air (OTA) software updates mean your vehicle always has the latest improvements within minutes, 24/7. If the deployment of air bags and/or roll over event is detected, an automated call will be made to emergency services (911). The tire monitoring system uses in-tire sensors to track pressure and temperature, relaying real-time updates to the infotainment screen and instrument cluster. Our team at Mack OneCall provides 24/7 full-service support with a network of experts to keep you and your drivers informed and connected. For on-the-go maintenance needs, Mack ASIST assembles consistent, complete and professional estimates of service recommendations. Our GuardDog Connect remote monitoring service notifies you of potential issues and alerts our service team if needed. An advanced chassis-to-body electrical integration system that can be tailored to the specific needs of each bodybuilder. Customize your own Keystone from the ground up with our digital truck builder experience. Roof fairing available in 12'6” or 13'6” overall height. Axle-forward 44-inch sleeper Roof fairing available in 13'6” overall height. Axle-forward 64-inch sleeper Roof fairing available in 13'6” overall height. Roof fairing available in 12'6” or 13'6” overall height. Axle-back 44-inch sleeper Roof fairing available in 13'6” overall height. Axle-back 64-inch sleeper Roof fairing available in 13'6” overall height. 13 liter540 hp max1,950 lb-ft torque max 12-speed direct and overdrive13-speed OD for Dynamic Overdrive13-speed creeper and multi-speed reverse available 12- and 13-speed direct and overdrive13-speed OD for Dynamic Overdrive13-speed creeper and multi-speed reverse available14-speed ultra-low creeper and multi-speed reverse available Hendrickson Haulmaax EX – Forward Pedestrian Detection – Heavy-Duty Flared Frame Rails – Electropneumatic braking system – Downview Mirror Camera – Construction-Grade Frame – Galvanized Steel Cab – Frontal Collision Mitigation and Rollover Support – Spacious Cab with 9 Inches of Added Width – Flat-Bottom Steering Wheel with Multifunction Controls – Ergonomic Dashboard with 12-Inch Mack CoPilot™ Display – Mack Protect™ Safety Suite – Advanced Automatic Climate Control – Standard Wide-Base and High-Back Seat – Enhanced Interior Storage and Overhead Compartments – Back-Up Camera System – Mack Integrated Uptime Suite ImpactShield Windshield Heated Aerodynamic Hood Mirrors Backup Camera with Input for Auxiliary Cameras Customizable Driver Sleeper Configurations LED Fog Lamps and Cornering Lamps Digital Mirror System (DMS) Advanced Tire Pressure Monitor System (TMS) Side Pedestrian Detection Mack Protect™ Pro and Mack Protect™ Premier Safety Suites 3-Way Adjustable Tilt/Telescoping Steering Column Available Heating, Cooling, and Massage Seat Functions MaxRide™ Air Suspension The New Standard of Versatility - Mack Keystone Mack Keystone Overview Mack Agriculture Solutions Mack Construction Solutions Mack Highway Solutions More than warranty protection. Peace of mind with comprehensive warranty coverage. Lock in parts and labor costs with plans that cover powertrains, after treatment systems, chassis, clutches and towing at today’s prices. Mack Financial Services provides the support you need to build your business. We build trucks for a lifetime of hard work. That means a Mack Certified used truck is one of the best values on or off the road. Learn about the Mack Certified Program Discover the legacy of jobsite versatility. Explore the Mack® Pinnacle™