X12 (Available 2018) for Heavy-Duty Truck


X12 (Available 2018) for Heavy-Duty Truck

The productivity leader.

Cummins X12 redefines the entire medium-bore engine category (10L-13L), setting new standards for productivity in regional-haul, vocational and intermodal truck applications. It’s performance that is not just unchallenged – it’s unbeatable. Smaller in size – at least 150 pounds lighter than the next closest competitive engine and up to 600 pounds lighter than other medium bore engines – the X12 still delivers powerful performance from 350 hp to 475 hp and 1250 to 1700 lb-ft of peak torque. At just 2,050 pounds, it has the highest power-to-weight ratio of any heavy-duty engine from 10 liters to 16 liters in size. The combination of power and efficiency is striking. You can gear the X12 to pass traffic in the left lane and still have plenty of fuel left in the tank for every job.

The Best Of All Worlds.

A legacy of proven performance goes into every Cummins X12. From L10 and M11 in the 1980s to ISM and ISX engines through the turn of the century, we’ve been building on a proven platform designed for maximum uptime and productivity. The X12 will be built in Jamestown, N.Y., in the same production facility as the Cummins X15, and will share many heavy-duty components, including our proprietary Cummins Holset VGT® Turbo, XPI fuel system, Electronic Control Module (ECM), our new Single Module™ aftertreatment system and ADEPT™ advanced electronic features. It’s an engine platform that’s been tested and is delivering in the toughest, most challenging operations around the world – like an Australian B-double and German Snowgroomer, it just keeps rolling.

Better In The Short Haul.
And Over The Long Haul.

Regional-haulers with hub-and-spoke operations can expect their Total Cost of Operation (TCO) to drop significantly with the X12. A low-friction design increases fuel economy while extended maintenance intervals and high mileage, real-world experience ensures maximum uptime. Less time spent in the shop means more money you can earn on the road.

Run Quicker. Deliver More.

The X12 is designed to deliver exceptional throttle response for inner-city stop-and-go operations, especially when paired with an automated manual transmission. Plus, its compact size enables shorter bumper-to-back of cab (BBC) dimensions with improved maneuverability. A new Cummins engine brake improves stopping power and lengthens service brake life. Drivers will really like the way the X12 performs, whether the traffic light is turning green or red.

Trust Makes All The Difference.

The most reassuring part of owning any Cummins-powered vehicle is knowing that we’ve always got your back. Cummins engine experts and our extensive training programs ensure service and support excellence that you can depend on. No matter the situation. We are committed to the success of your business, which means complete dedication to working with you as a partner on everything from upfront vehicle and engine spec’ing to maximizing your uptime out on the road. You aren’t just buying a Cummins engine – you’re buying Cummins expertise and commitment anywhere and everywhere your business takes you. And no matter where that is, peace of mind is always nearby with over 3,500 authorized Cummins parts and service locations throughout North America.

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Advertised Horsepower


261-354 KW

Peak Torque

1250-1700 lb-ft

1695-2305 N•m

Governed Speed

2000 rpm

Clutch Engagement Torque

800 lb-ft

1085 N•m

Number of Cylinders


System Weight

2,241 lb

1,017 kg

Engine (Dry)

2,050 lb

930 kg

Aftertreatment System*

191 lb

87 kg

Engine Finder Specifications

Certification Level EPA 2017
Power 350 - 475 hp / 261 - 354 kW
Torque 1250 - 1700 lb-ft / 1695 - 2305 N•m

Brochures Available

Title Bulletin Number Request View  
2018 X12 Brochure 5410581 View  Download
Every Coverage. North American Truck Coverages For 2017 X15 And ISX12 Engines Brochure 5410668 Request View  Download
X Series Euro VI Brochure – A4 Format 5410607 View  Download
X12 Benefits Summary Flyer 5410804 Request View  Download

Torque & Horsepower Curves

Cummins X12 Torque Curve

Cummins X12 Horsepower Curve