The twin is what you buy when the single is not enough. Two motors, 6.16 CFM of free flow air and 4.68 CFM at 29 psi, 150 psi maximum, and the specification that actually changes how you use it: a 100 percent duty cycle. It does not need 30 minutes off after 30 minutes on, so a full set of 35" tires is one continuous job rather than a schedule.
It is designed for tires and Air Locker activation, and with a 1 gallon air tank it will run most air tools properly rather than intermittently. Integrated pressure switch and relays, an IP55 rated brushless cooling fan over the electronics, motors and cylinder heads, hard anodized cylinder bores, Teflon impregnated carbon fiber piston seals and an over-pressure safety valve are all standard. On 12 V it draws 28.4 A at free flow, 50.4 A at 29 psi.
What's Included:
Twin motor 12 V compressor assembly with integrated pressure switch and relays
Anodized mounting bracket
Washable air filter assemblies
Complete wiring loom with illuminated ARB dash switch
Mounting hardware and terminals
Features
100% Duty Cycle The specification that matters. It runs continuously rather than on a 30 on, 30 off schedule, so a full air up on big tires is one uninterrupted job.
Twice The Air 6.16 CFM free flow and 4.68 CFM at 29 psi from two motors, against 3.08 and 2.34 from the single. On 35" tires that difference is the trip.
150 psi A higher maximum pressure than the single motor units, which is what makes tank charging and bead seating realistic.
Air Tools With A Tank Paired with a 1 gallon air tank it will run most air tools properly, rather than the intermittent use a tankless single motor unit allows.
Cooled And Sealed An IP55 rated brushless fan cools the electronics, motors and cylinder heads, and the whole assembly is sealed against moisture and dust.
Built To Last Hard anodized cylinder bores for reduced friction, Teflon impregnated carbon fiber piston seals, an anodized bracket that dissipates heat, and an over-pressure safety valve.
Fitment & Compatibility
Application
Fit
Any 12 V vehicle with a flat mounting surface roughly 11" x 8"
✓ Fits
ARB Air Locker air supply
✓ Fits, purpose designed
Air tools, with a 1 gallon air tank such as ARB 171507
✓ Fits
Large tires, 35" and up
✓ Fits, this is the reason to choose the twin
24 V vehicles
✗ Does not fit, use the CKMTA24 instead
Fit guidance: Confirm your system voltage first. Beyond that this is a universal mount component rather than a vehicle specific part, but it is physically larger than the single motor unit at 10.8" x 7.5" x 4", so measure the space before you commit to a location.
Specifications
Model: ARB Maximum Performance On-Board Air Compressor, twin motor
Part Number: CKMTA12
Voltage: 12 V DC
Motors: Twin
Free-Flow Air Delivery: 6.16 CFM (174.4 L/min)
Air Delivery at 29 psi: 4.68 CFM (131.8 L/min)
Maximum Pressure: 150 psi
Current Draw: 28.4 A at free flow, 50.4 A at 29 psi
Maximum Current: 68.6 A
Duty Cycle: 100%
Ingress Protection: IP55
Dimensions: 10.8"L x 7.5"W x 4"H
Product Weight: 17.4 lb (8.8 kg)
Thermal Protection: Internal thermal protection with brushless cooling fan
Shipping Weight: 25 lb
Warranty: 3 years
UPC: 9332018003836
Installation
Type: Bolt-on to a flat surface; full electrical kit supplied · Time: 2 to 4 hours for a tidy engine bay install with switch wiring · Tools: Drill, socket set, crimper; basic 12 V wiring competence · Difficulty: Moderate
The twin draws considerably more current than the single, so size the supply cable and fusing to ARB's figures rather than reusing a single motor installation. Mount away from exhaust heat and direct water spray, and leave clearance for the cooling fan to breathe.
Resources
Everything you need for your ARB On-Board Air Compressor, 12V Twin Motor, 6.16 CFM, 150 psi, 100% Duty Cycle, in one place.
Warranty. ARB covers this product with a 3-year unlimited-mileage warranty through ARB North America (Air Locker Inc., Auburn, WA), the term ARB publishes for it in its own product record. Wear items such as filter elements and seals fall under ARB's 1-year wear-item schedule. We describe ARB's warranty exactly as published and it is honored through any ARB-authorized dealer in the US.
Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.
Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.
About ARB
ARB started in 1975 in a Melbourne garage, when Tony Brown began building bull bars for the four-wheel drives crossing Australia's outback, and the company has grown into the largest 4x4 accessories maker in the southern hemisphere. Its engineering campus in Kilsyth, Victoria still designs and builds the products the brand is known for, and ARB now runs offices in the USA, Europe and the Middle East with an export network reaching more than 100 countries.
Air is one of the things ARB is best known for. The compressor line, the Air Locker system it was built to feed, and the fittings, hoses and gauges that tie them together are engineered as one system, which is why an ARB air part is specified by the same part numbers the factory uses. In North America ARB operates from Auburn, Washington as Air Locker Inc., backing every product with a US warranty program. Prestige Truck is an authorized ARB dealer. Every part we ship is a genuine US-market unit with full ARB North America warranty coverage.
The Compressor Range Explained
ARB's own walk through of how the single and twin, portable and on-board compressors differ, and which job each one is actually for.
Useful if you are still choosing between them rather than committed to this one.
Twin Compressor Demo
ARB running a twin motor compressor under load, showing the airflow a twin actually delivers against the clock.
This film is specific to the twin motor units and is only shown on twin listings.
How Fast Is The ARB Twin?
A thirty second answer to the question everyone asks about the twin: how long a full air up actually takes.
Filmed on the twin motor compressor, so it is only shown on twin motor listings.
Frequently Asked Questions
Straight answers on specs, fit and support
Is the twin worth it over the single?
If you run 35" tires or bigger, or you want to run air tools, or you simply do not want to wait: yes. Twice the air and a 100 percent duty cycle instead of 50 percent is a different tool, not a slightly better one.
What does 100 percent duty cycle actually mean?
That it can run continuously rather than needing to rest. The single motor units are rated 30 minutes on and 30 minutes off. The twin has no such limit, which is what makes a full four tire air up on big tires one continuous job.
Can it run air tools?
Properly, yes, with a 1 gallon air tank such as the ARB 171507 in the system. Without a tank it will run small tools intermittently like any tankless compressor.
How much current does it draw?
On 12 V, 28.4 A at free flow, 50.4 A at 29 psi, with a maximum of 68.6 A. Size the cable and the fuse to those numbers; this is not a job for the wiring you had on a single motor unit.
Will it fit where my old compressor was?
Measure first. At 10.8" x 7.5" x 4" it is meaningfully larger than the single motor unit, and it needs clear air around the cooling fan.
Why is there no installation video?
ARB has not published one for any of its compressors, and we checked every product page and both official ARB channels to be sure. Rather than substitute a fitting film for a different product, the tab is empty and the installation guide is in Resources.
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