If you line up the specs of the Y28 hand hold rock drill, you quickly see it’s built as a fast, high‑frequency Pneumatic jack hammer rather than a light DIY tool. This model is a hand held jack hammer aimed at drilling smaller to medium holes efficiently, especially when you need speed and a clean hole in hard or medium‑hard rock.
The key figures are very clear:
Weight: 26 kg
Length: 661 mm
Cylinder diameter: 80 mm
Piston stroke: 60 mm
Air pressure: 0.4–0.63 MPa
Impact frequency: ≥37 Hz (2220 bpm)
Air consumption: <81 L/s (4.86 m³/min)
Air pipe inner diameter: 25 mm
Water pipe inner diameter: 13 mm
Drill bit diameter: 28–42 mm
Shank dimensions: 22 × 108 ±1 mm
Just from this data you can already tell: the Y28 is a relatively heavy hand held jack hammer (26 kg) with a big 80 mm cylinder, a slightly shorter 60 mm stroke, but a very high impact frequency of ≥37 Hz and quite a high air demand of <81 L/s. In other words, a fast, powerful Pneumatic jack hammer that needs a serious air supply and correct hose sizing to perform as designed.
What Kind of Jack Hammer Is the Y28, Really?
Instead of only listing parameters, it helps to explain them the way you would to a customer standing in front of the machine.
26 kg weight, 661 mm length
At 26 kg, the Y28 sits in the “heavy” hand‑held category. It’s not something you wave around with one hand. The 661 mm length keeps it compact enough for underground headings and faces.80 mm cylinder, 60 mm piston stroke
The combination of a large 80 mm cylinder and 60 mm stroke means each blow still carries serious energy, even though the stroke is slightly shorter than some other models. The big cylinder area makes up for that.Impact frequency ≥37 Hz (2220 bpm)
This is one of the most important numbers: ≥37 blows per second. That’s a lot. Many similar Pneumatic jack hammer models run in the 23–30 Hz range. So the Y28 is clearly designed for high blow frequency and good penetration speed, especially with bit diameters around 28–34 mm, but it still supports up to 42 mm.Air pressure 0.4–0.63 MPa
It can work from 0.4 MPa up to 0.63 MPa. In practice, you usually want around 0.5–0.6 MPa at the drill under load to get the best performance, just like your general product knowledge always stresses: “real working pressure at the jack hammer, not just at the compressor.”Air consumption <81 L/s (4.86 m³/min)
This is a big one. <81 L/s is almost 5 m³/min. That’s quite high for a single hand held jack hammer, which tells you two things:the Y28 is powerful and fast;
you absolutely need a compressor and air piping that can keep up.
Air pipe inner diameter 25 mm, water pipe 13 mm
The required 25 mm inner diameter for the air pipe is a clear warning: if you try to run this tool through a thin hose (like 16 mm or 19 mm over a long distance), you will lose a lot of pressure and the “≥37 Hz” and power on the data sheet won’t show up in your real drilling. The 13 mm water line is standard for dust suppression and flushing.Bit diameter 28–42 mm, shank 22 × 108 ±1 mm
The Y28 covers 28–42 mm hole diameters and uses the very common 22 × 108 mm hex shank. That makes it easy to share steels and bits with many other jack hammer models in the fleet.
So if you sum it up: the Y28 is a hand held jack hammer for users who want high blow frequency and strong power in the 28–42 mm hole range, and who have enough compressor capacity to feed a Pneumatic jack hammer that can consume up to 81 L/s of air.
How the Y28 Pneumatic Jack Hammer Works in Practice
Mechanically, the Y28 follows the same basic principle as described in your general rock drill product knowledge:
Compressed air at 0.4–0.63 MPa enters the 80 mm cylinder through a 25 mm inner‑diameter air hose.
The piston runs back and forth over a 60 mm stroke, hitting the tail of the 22 × 108 mm drill steel.
Each impact (at ≥37 Hz) sends a stress wave through the steel to the bit, which breaks rock at the bottom of the 28–42 mm hole.
Between impacts, the steel rotates a small angle so the bit teeth always meet fresh rock.
Air and water (through the 13 mm water pipe) flush cuttings and dust out of the hole.
As long as pressure and lubrication are correct, the Y28 keeps this impact‑rotation‑flushing cycle going smoothly.
Because of its high blow frequency, the Y28 often feels “livelier” than slower Pneumatic jack hammer models, but with 26 kg weight and correct holding technique, it stays controllable and productive.
Typical Uses for the Y28 Hand Held Jack Hammer
Given its data:
Weight: 26 kg
Impact frequency: ≥37 Hz
Air consumption: <81 L/s
Bit diameter: 28–42 mm
The Y28 is a good fit for:
Mining and quarrying where most blast holes are in the 28–38 mm range.
Construction and small tunneling where many anchor or blast holes are drilled with 28–42 mm bits.
Situations where you already have a compressor that can deliver close to 5 m³/min for one or more drills and you want a fast hand held jack hammer rather than a slow, low‑air model.
Questions Customers Usually Ask About the Y28
Based on the Q&A style from your other products and real buyer concerns, here are some key questions and answers that lean on the Y28’s actual numbers.
1. What size compressor do I need for the Y28 Pneumatic jack hammer?
The data sheet says:
Air pressure: 0.4–0.63 MPa
Air consumption: <81 L/s (4.86 m³/min)
Air pipe inner dia.: 25 mm
For one Y28:
You should plan for at least 5 m³/min of compressor capacity at around 0.6–0.7 MPa if you want to maintain roughly 0.5–0.6 MPa at the drill while drilling.
The air distribution line and hose to the drill must be at least 25 mm inner diameter, as specified. If you neck it down to 19 mm or 16 mm, you will not get the pressure and flow the jack hammer needs.
If a customer wants to run two Y28 drills at the same time, you simply multiply: now you’re in the 9–10 m³/min range, plus some margin for losses and other tools.
2. The Y28 uses a lot of air (<81 L/s). Is it worth it?
Yes, but only if your work justifies it.
The Y28’s high air consumption is directly tied to its:
80 mm cylinder
60 mm stroke
Impact frequency ≥37 Hz
Those three together mean the Pneumatic jack hammer is moving a lot of air fast to produce many strong blows per second. In return, you get:
Faster penetration in 28–42 mm holes, especially in medium‑hard to hard rock.
More productive drilling shifts if the operator and compressor can keep up.
If a customer has a small compressor and wants to save air, then a lighter, lower‑consumption jack hammer might be a better choice. But if they already operate a bigger compressor and want higher drilling speed, the Y28’s air usage makes sense.
3. Is 26 kg too heavy for a hand held jack hammer?
On paper, the Y28 is:
Weight 26 kg
Length 661 mm
26 kg is not light. However:
For downward or horizontal drilling with proper stance, experienced operators can handle it.
The extra mass helps the drill stay seated against the rock, especially at ≥37 Hz. A very light machine at that frequency would bounce more.
In practice, many sites using the Y28 treat it as a serious production hand held jack hammer, not as a light, all‑day overhead tool.
If a customer is planning a lot of overhead work, you should be honest and suggest a lighter model. For face drilling and bench work, the 26 kg weight is usually an advantage.
4. What bit sizes and steels can I use with the Y28?
The Y28 is quite flexible:
Drill bit diameter: 28–42 mm
Shank size: 22 × 108 ±1 mm
That means:
You can use smaller bits (around 28–32 mm) when you want high drilling speed or for anchor holes.
You can go up to 42 mm for certain blast patterns, although penetration will naturally slow as diameter increases.
Because it uses 22 × 108 mm shanks, you can typically share steels and many bits with other hand held jack hammer models that your site already uses.
If someone asks about running much larger bits with the Y28, you can clearly say it’s outside the specified 28–42 mm range and not recommended.
5. How should I set air and water for best drilling with the Y28?
From the spec:
Air pressure: 0.4–0.63 MPa
Air pipe inner dia.: 25 mm
Water pipe inner dia.: 13 mm
Practical guidelines (in line with your general product knowledge):
Aim for about 0.5–0.6 MPa at the drill while it is striking. That usually means a higher setting at the compressor to compensate for pipe losses.
Always use a 25 mm inner‑diameter air hose for the final run to the Y28. This is critical for a high‑consumption Pneumatic jack hammer like this.
Use the 13 mm water line with sufficient pressure so that water flows steadily through the bit, carrying cuttings out of the 28–42 mm hole and keeping dust down.
Good pressure and proper flushing are just as important for performance and bit life as the jack hammer model itself.
6. What daily maintenance does the Y28 hand held jack hammer need?
The Y28 doesn’t require exotic maintenance, but with high frequency and high air flow, basics matter even more:
Before work
Blow out the 25 mm air hose to remove water and debris.
Check your lubricator (if external) and make sure it’s filled with appropriate rock drill oil.
During work
Listen for changes in the sound or rhythm of the jack hammer. Sudden changes often point to lubrication or pressure issues.
Check the hose connections regularly. At ≥37 Hz, vibration can slowly loosen clamps and joints.
After work
Shut off water first, then run the drill shortly on air only to blow out moisture from the passages and the 13 mm water line.
Inspect the 22 × 108 mm shank and chuck area for wear and clean off dust and mud.
These are the same principles you already highlight in your general rock drill product knowledge: clean air, constant lubrication, and short daily checks give much longer service life for any Pneumatic jack hammer, especially one as fast as the Y28.
Summary – Where the Y28 Fits in Your Lineup
Looking at the full data:
Weight 26 kg, length 661 mm
80 mm cylinder, 60 mm stroke
Impact frequency ≥37 Hz (2220 bpm)
Air pressure 0.4–0.63 MPa, air consumption <81 L/s (4.86 m³/min)
Air pipe 25 mm, water pipe 13 mm
Drill bit diameter 28–42 mm, shank 22 × 108 ±1 mm
the Y28 hand hold rock drill is best described as a high‑frequency, high‑performance Pneumatic jack hammer for users who:
Drill mainly 28–42 mm holes;
Have a compressor that can genuinely supply around 5 m³/min;
Want a productive, robust hand held jack hammer rather than a low‑consumption, low‑speed tool.
Used with the correct 25 mm air hose, proper water flushing and regular maintenance, the Y28 delivers the kind of drilling speed and reliability that many mines and contractors expect from a serious Pneumatic jack hammer in this size class.