When you look at the data sheet of the Y20ly air‑leg rock drill, you can pretty much guess what kind of tool it is before you see it in the field. This model is a relatively light Pneumatic jack hammer in the air‑leg class: 18 kg weight, 609 mm overall length, and a 60 mm cylinder with 50 mm piston stroke. It is designed to work at an operating air pressure of 0.4 MPa, with moderate air consumption of 1.3 m³/min (about 21.6 L/s).
On paper, it is clearly not the biggest hammer in the range, but it gives you a practical balance: enough impact for 34–40 mm drill bits, while still keeping air consumption, weight and handling under control. That’s exactly where a lot of underground and small tunnel jobs sit in daily work.
Key Technical Data of the Y20ly Hand Held Jack Hammer
Here are the main parameters as they are:
Model: Y20ly air‑leg rock drill
Type: Air‑leg Pneumatic jack hammer / can be used as a powerful hand held jack hammer with leg removed
Weight: 18 kg
Overall length: 609 mm
Operating air pressure: 0.4 MPa
Air consumption: 1.3 m³/min (≈21.6 L/s)
Times of impact: 30 Hz
Diameter of cylinder: 60 mm
Inner diameter of air cylinder: 52 mm
Piston stroke: 50 mm
Diameter of drill bit: 34–40 mm
Inner diameter of air pipe: 16 mm
Inner diameter of water pipe: 8 mm
Specification of bit shank: 22 × 108 ±1 mm
Just from this list you can see the positioning:
18 kg: firmly in the “hand‑held” rock drill range (under about 30 kg), easy enough to handle with an air‑leg.
60 mm cylinder, 50 mm stroke, 30 Hz: impact energy and frequency designed for medium‑diameter bits (34–40 mm) and medium‑hard rock.
1.3 m³/min air consumption with 16 mm air pipe: lower air demand than heavier air‑leg hammers (that often need 2–3 m³/min and 19 mm hoses), which saves on compressor size and fuel.
22 × 108 ±1 mm shank: shares steels and bits with most common hand held jack hammer models.
What the Numbers Tell Us About This Pneumatic Jack Hammer
If we combine these Y20ly numbers with general pneumatic rock drill principles:
Operating air pressure 0.4 MPa
This sits right at the lower end of the recommended working range for many Pneumatic jack hammers (typically around 0.4–0.5 MPa). It means the Y20ly is engineered to give reasonable drilling speed even at 0.4 MPa, which is helpful on sites where pressure is not always very high or where you want to reduce wear and fuel consumption.Impact: 30 Hz with a 60 mm cylinder and 50 mm stroke
30 Hz means roughly 30 blows per second, about 1,800 blows a minute. With a 60 mm cylinder and 50 mm stroke, each blow has solid energy, just slightly below larger air‑leg hammers with 65 mm cylinders. For 34–40 mm bit diameters, this is usually enough to get a clean, steady penetration rate without being too aggressive on bits.Air consumption 1.3 m³/min (21.6 L/s)
This is only about half of what the larger air‑leg drills consume. The 16 mm air pipe confirms that it is built for a moderate air flow, not for maximum power at any cost. In practical terms, this means a smaller compressor can drive the Y20ly, and it fits well on sites with limited air capacity.Water pipe 8 mm
An 8 mm inner diameter water pipe is enough for good flushing and dust suppression for 34–40 mm holes. It matches the “lighter” nature of this jack hammer: you still have wet drilling, but water demand and hose size are reasonable.
In short, the Y20ly is a Pneumatic jack hammer optimized more for efficiency and handling than for maximum impact. It’s the type of hand held jack hammer you pick when you drill a lot of 34–40 mm holes and want good performance without a huge compressor.
How the Y20ly Air-Leg Rock Drill Works in the Hole
Mechanically, the Y20ly follows the same impact‑plus‑rotation pattern as the other pneumatic rock drills in your product knowledge:
Compressed air at about 0.4 MPa enters the 60 mm cylinder.
The piston moves with a 50 mm stroke, hitting the tail of a 22 × 108 mm drill steel 30 times per second.
Each blow sends a stress wave down the steel to the bit, which breaks rock at the hole bottom.
Between blows, the drill steel rotates a small angle so each impact lands on fresh rock, not on the same crushed spot.
Broken rock and dust are flushed out by air and water coming through internal passages, supplied via the 16 mm air pipe and 8 mm water pipe.
The air‑leg provides steady feed force to keep the bit pressed against the rock, which is critical for any jack hammer to work efficiently.
Because it uses the common 22 × 108 ±1 mm shank, you can use standard chisel, cross or button bits in the 34–40 mm diameter range. This makes it easy to match bit design to rock hardness and hole requirements.
Where the Y20ly Hand Held Jack Hammer Makes Sense
From the parameters, the Y20ly fits naturally into:
Underground mining and tunneling in medium‑hard rock
At 0.4 MPa, 30 Hz impact, 60 mm cylinder and 50 mm stroke, it gives enough energy to drill 34–40 mm blast holes without being over‑sized. The air‑leg takes the weight, so the operator mainly steers the machine.Small tunnels, water tunnels, municipal jobs
When the space is limited and the compressor is not huge, a Pneumatic jack hammer with 1.3 m³/min air consumption is much easier to supply than bigger models.Support and anchor holes
For rock bolts in the 34–40 mm bit range, the Y20ly provides a good compromise between drilling speed and control. The 8 mm water pipe is enough to keep holes clean and dust suppressed.Jobs where you sometimes need hand‑held flexibility
With 18 kg weight and 609 mm length, the Y20ly body can also be used as a strong hand held jack hammer without the leg, for short or awkward drilling positions.
Common Questions About the Y20ly Pneumatic Jack Hammer
Based on your existing Q&A and these parameters, here are a few practical questions that customers usually care about, along with straightforward answers.
1. What size compressor do I need for the Y20ly?
The data shows:
Operating air pressure: 0.4 MPa
Air consumption: 1.3 m³/min (21.6 L/s)
Air pipe inner diameter: 16 mm
So for one Y20ly jack hammer:
You want a compressor that can deliver a bit more than 1.3 m³/min at around 0.5–0.6 MPa, so that after hose and pipe losses you still have about 0.4 MPa at the drill while it is actually working.
Make sure the main hose to the drill is close to the specified 16 mm inner diameter to avoid large pressure drops.
If you plan to run two or three Y20ly units at the same time, you simply multiply the flow (2.6 or 3.9 m³/min) and add some margin. Compared with larger air‑leg Pneumatic jack hammers, the Y20ly clearly saves air, which also means a smaller compressor or lower fuel cost.
2. Is 18 kg really “hand held”? Will it be tiring to operate?
From general rock drill classification, anything below about 30 kg is still in the hand‑held rock drill range. At 18 kg, the Y20ly is similar in weight to many mid‑size drills:
In air‑leg mode, the leg carries most of the 18 kg; you do not hold the full weight in your arms all the time.
As a pure hand held jack hammer, 18 kg is not “light”, but it is manageable for experienced operators for horizontal or slightly inclined holes.
The advantage of this 18 kg weight is that, together with the 60 mm cylinder and 50 mm stroke, the Y20ly stays more stable on the rock face. It does not “jump” as much as very light tools, especially when you use 34–40 mm bits in harder rock.
3. How does the Y20ly compare in drilling speed?
The catalog gives:
Impact frequency: 30 Hz
Bit diameter: 34–40 mm
Operating air pressure: 0.4 MPa
Air consumption: 1.3 m³/min
In your product family, drills with 30–35 Hz impact and similar cylinder sizes usually reach reasonable penetration in medium‑hard rock when run at 0.4–0.5 MPa. The Y20ly is clearly not the most aggressive hammer (that would be the heavier models with 65 mm cylinders and higher air consumption), but it offers:
Stable drilling for 34–40 mm holes
Lower air usage
Easier control and less bit wear compared to very high‑energy tools
In real jobs, that often means slightly slower than the biggest air‑leg hammers, but more economical and easier on both the compressor and the operator.
4. What bits and steels can I use with this jack hammer?
The specification is:
Bit shank: 22 × 108 ±1 mm
Recommended bit diameter: 34–40 mm
This means:
Any standard 22 × 108 steel (tapered rods) will fit, which is convenient because many other hand held jack hammer models use the same shank.
You can choose chisel, cross or button bits in the 34–40 mm range, depending on rock type and hole requirements.
If your site already uses 22 × 108 steels, the Y20ly can usually share tooling with your existing Pneumatic jack hammers.
5. How should I manage air and water for best performance?
For the Y20ly data:
Operating air pressure: 0.4 MPa
Air pipe: 16 mm inner diameter
Water pipe: 8 mm inner diameter
Based on general guidelines:
Try to keep 0.38–0.42 MPa at the drill while it is hitting (measure near the machine, not only at the compressor).
If pressure at the drill drops below about 0.35–0.4 MPa during drilling, penetration and flushing will suffer; increase compressor setting or check for hose restrictions.
Use the 8 mm water line to provide continuous, moderate water flow. Enough to carry cuttings out and reduce dust, but not so much that you flood the hole and slow down the bit.
Balanced correctly, air and water help the Pneumatic jack hammer keep the bit cool, the hole clean and the drilling more efficient.
6. What daily maintenance does the Y20ly need?
The routine is similar to other pneumatic rock drills:
Before starting:
Blow out the 16 mm air hose to remove water and debris.
Check that your lubricator is filled with clean rock drill oil, not waste oil.
At start‑up:
Open air slowly and let the Y20ly run at low speed for a short time; listen for any abnormal sounds.
During operation:
Periodically check hose connections, bolts and clamps; 30 Hz impact vibration can slowly loosen them.
After work:
Turn off water first, then let the jack hammer run briefly with air only to blow out moisture.
If you will not use it for a while, add some oil and store it in a dry, clean place.
These simple steps follow directly from the general product knowledge: good air, correct pressure, sufficient lubrication and regular checks are what keep any Pneumatic jack hammer in good condition.
Conclusion: A Balanced, Efficient Pneumatic Jack Hammer for Everyday Work
Putting all the data and experience together, the Y20ly air‑leg rock drill is best described as a compact, efficient hand held jack hammer set up for air‑leg use:
18 kg weight and 609 mm length – manageable size, suitable for daily underground work
60 mm cylinder, 52 mm inner cylinder diameter, 50 mm stroke – solid impact for 34–40 mm drill bits
30 Hz impact frequency and 0.4 MPa operating pressure – tuned for medium‑hard rock with reasonable drilling speed
1.3 m³/min (21.6 L/s) air consumption with 16 mm air pipe – lower air demand, easier on the compressor
8 mm water pipe and 22 × 108 ±1 mm shank – standard wet drilling setup with widely available steels
If your job is mostly small to medium tunnels, mining headings, anchor holes or similar work with 34–40 mm bits, and you want a reliable Pneumatic jack hammer that does not require a very large compressor, the Y20ly is a practical, field‑oriented choice. It fits well beside heavier air‑leg drills in your fleet and shares the same 22 × 108 steels as many other hand held jack hammer models, which keeps daily use and maintenance simple.