Blog Post
From Raw Steel to Hydraulic Power: The Story Behind the MTB 365 Cylinder
By Merit · Industrial Hydraulics
There’s a moment on every construction site, every demolition project, every mining operation — when everything comes down to one component holding up under pressure. Literally.
That component, more often than not, is the hydraulic cylinder inside the breaker. And that’s exactly where the MTB 365 Cylinder by Merit was designed to live.
Why Hydraulic Breaker Components Are Unforgiving
Hydraulic breakers operate in some of the harshest conditions in heavy industry. Repeated high-impact cycles, extreme pressure loads, abrasive environments — the cylinder at the heart of it all has no margin for error. A hairline crack, an imprecise bore, a surface that wasn’t treated correctly — any one of these can mean costly downtime, failed projects, or worse.
This is why at Merit, we don’t approach cylinder manufacturing as a production exercise. We approach it as an engineering challenge.
Built From the Ground Up — Literally
The MTB 365 starts as raw steel — but not just any steel. Our material goes through a three-stage metallurgical process: Electric Arc Furnace (EAF), Ladle Furnace (LF), and Vacuum Degassing (VD). This combination eliminates impurities, controls chemical composition with precision, and produces a homogeneous, high-integrity billet before a single machining operation begins.
The result? A cylinder body with 1.60% Chromium, 1.52% Nickel, and 0.27% Molybdenum — a composition specifically suited for toughness, wear resistance, and long service life under dynamic loading.
Then comes the forging. Hot forging at controlled temperatures aligns the grain structure of the steel, dramatically improving fatigue resistance compared to cast alternatives. The MTB 365 isn’t poured into shape — it’s hammered into strength.
Precision That You Can Measure
Once forged, every MTB 365 blank enters our CNC machining process — where tolerances of ±0.01 mm are not a target, they are the standard. The bore diameter of 280 mm and total length of 750 mm are held consistently across every unit, every batch, every order.
Surface hardness is measured at 293 HB — firm enough to resist wear, controlled enough to avoid brittleness. It’s a balance that takes process discipline to achieve repeatably.
Quality That Goes Beyond Visual Inspection
At Merit, we believe a cylinder shouldn’t just look right — it should be provably right.
Every MTB 365 undergoes 100% Ultrasonic Testing (UT), scanning the full volume of the material for internal discontinuities that no surface inspection could ever detect. We also conduct radiation testing using the Radcomm RC 4069-2 device, and surface crack verification is performed after final machining in accordance with DIN 7527 Part 6.
Every unit ships with full material traceability documentation and a quality inspection report. Because our customers deserve to know exactly what they’re installing.
21 Days. 12 Months. No Compromise.
We understand that in industrial operations, lead time matters as much as quality. The MTB 365 is delivered within 21 working days from order confirmation — through a structured production workflow that moves from material procurement to CNC machining, quality control, and final dispatch without cutting corners at any stage.
And once it’s installed, our 12-month manufacturer warranty backs every component we produce. If something isn’t right, we make it right.
Who Is the MTB 365 For?
Whether you’re an OEM integrating cylinders into new breaker production, or a maintenance team sourcing reliable replacements for field units — the MTB 365 was built with your application in mind.
It’s not the cheapest option on the market. It was never meant to be.
It’s the one that performs when everything else is on the line.
Interested in the MTB 365 Cylinder or custom configurations for your application? Contact the Merit team to discuss specifications, pricing, and bulk order options.
📩 info@meritautomotive.com
Merit · Industrial Hydraulics · Built to Last
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