H22 Tapered Button Bit Size Guide: How to Choose 30–40 mm Diameter

Direct answer: choose an H22 tapered button bit by starting with the required finished hole diameter, then confirm the rock drill’s documented or reference hole range, the H22 drill-steel interface, and the exact taper angle of the rod and bit. “H22” by itself is not enough to approve a 30, 32, 34, 36, 38, or 40 mm bit. A bit can belong to the H22 family and still be wrong for the installed drill, rod, taper, or target hole.

PerfoMax’s current H22 taper button bit page lists 30, 32, 34, 36, 38, and 40 mm as inquiry sizes. The same page also warns that 7°, 11°, and 12° taper connections are used in the market and that the exact taper must be confirmed before quotation. That means diameter selection and taper compatibility are two separate checks.

1. What “H22” Tells You—and What It Does Not

In this product family, H22 identifies the drill-steel family used with small-hole pneumatic rock drilling systems. PerfoMax currently lists H22 × 108 mm shank configurations on several pneumatic rock drills and offers a dedicated H22 × 108 mm tapered drill rod with an 11° bit connection option.

However, an H22 label does not automatically tell you:

• the correct bit diameter;
• the taper angle at the rod-to-bit connection;
• whether the rod is the correct length for the drill and job;
• whether the selected bit style is suitable for the rock condition;
• whether the installed rock drill is documented for that hole diameter.

This is why an RFQ such as “H22 button bit, 38 mm” is incomplete. A better RFQ identifies the rock-drill model, current rod or shank, taper angle, required hole diameter, drilling condition, and quantity.

2. Current PerfoMax 30–40 mm Size Range: What the Numbers Mean

The current PerfoMax H22 taper button bit page lists six inquiry diameters: 30, 32, 34, 36, 38, and 40 mm. These are nominal bit sizes, not a promise that every size is approved for every H22 rock drill.

A useful way to screen the sizes is to compare them with the current reference hole ranges published on the relevant PerfoMax rock-drill pages:

Important: “within the range” means only that the nominal diameter falls inside the current reference range shown on the product page. It does not prove that a particular 34–40 mm bit is approved for a particular machine in the field. The exact drill variant, rod, taper, bit design, operating condition, and quotation drawing still need to match.

3. Match the Bit Diameter to the Exact Rock Drill

PerfoMax’s current product pages provide a practical screening reference for three H22 × 108 pneumatic rock drills:

• Y19A hand-held pneumatic rock drill: current page lists a 34–40 mm drilling-diameter range and H22 × 108 mm shank.
• YT28 air-leg pneumatic rock drill: current page lists a 34–42 mm hole range and H22 × 108 mm shank.
• YT29A air-leg pneumatic rock drill: current page lists a 34–45 mm hole range and H22 × 108 mm shank.

For these three current pages, 34–40 mm is the overlap between the listed PerfoMax button-bit range and the listed drill-diameter ranges. That overlap is useful for shortlisting, but it is not a substitute for controlled compatibility confirmation.

Be more careful with a model family such as YT24. PerfoMax’s current YT24-series page explicitly requires buyers to confirm the exact model/suffix because YT24-series variants can differ materially. Do not convert a family name into a universal bit-size rule.

4. Diameter and Taper Angle Are Separate Compatibility Decisions

One of the most common ordering errors is to get the diameter right and the taper wrong. PerfoMax’s current button-bit page states that 7°, 11°, and 12° connections are used in the market depending on the drill rod and tool system. Sandvik’s current tapered-bit range independently shows the same three taper families and a 28–40 mm tapered-bit diameter range for handheld, bench, quarrying, and bolting applications.

That industry evidence supports a simple rule: do not infer taper angle from bit diameter. A 38 mm button bit can exist with different taper configurations. Likewise, an 11° H22 rod should be paired only with a bit whose mating connection is confirmed for that rod.

PerfoMax’s current H22 × 108 mm tapered drill rod is explicitly presented as an 11° connection option. If the existing tool system uses 7° or 12°, do not substitute the 11° rod merely because the shank family and nominal bit diameter appear similar.

5. Does a Larger H22 Bit Automatically Drill Better?

No. Diameter is a job requirement and a system constraint, not a quality ranking.

A larger nominal hole removes a larger cross-section of rock and changes the contact geometry at the bottom of the hole. In practice, drilling performance also depends on the rock drill, percussion energy and frequency, feed force, rotation, flushing, button layout, carbide condition, rock strength and abrasiveness, fracture pattern, and operator setup. Therefore, there is no defensible universal rule that a 40 mm bit is always faster, slower, stronger, or more economical than a 34 mm bit.

The correct question is: what is the smallest and most appropriate bit diameter that produces the required hole while staying inside the approved operating envelope of the drill string and rock drill?

If the job requires a 38 mm hole, selecting 40 mm simply because it is “larger” adds no automatic benefit. If the job requires 40 mm, selecting 34 mm because it seems easier on the drill fails the hole requirement. Start from the engineering and blasting/anchoring/construction requirement, then confirm the drilling system.

6. A 7-Step H22 Button Bit Size Selection Workflow

1. Define the required finished hole diameter. Record the nominal target and any tolerance or downstream requirement that matters to the job.
2. Identify the exact rock drill. Do not stop at a broad family name if suffixes or variants exist.
3. Check the drill’s documented/reference hole range. If the desired diameter is outside the published range, stop and verify with the equipment/tool supplier rather than forcing a bit choice.
4. Confirm the drill-steel interface. Verify H22 × 108 mm or the actual installed shank/rod identification from markings, dimensions, photos, and approved drawings.
5. Confirm taper angle separately. Match 7°, 11°, or 12° to the existing rod-and-bit system. Never infer this from diameter.
6. Choose bit style for the application. Button, cross, and chisel bits are different tool choices. If the buyer is unsure, use the current application and rock condition to select style after the system interface is locked.
7. Lock the quotation by drawing/specification. Before a production order, confirm diameter, taper, rod connection, quantity, and any inspection/packing requirements in the quotation or controlled drawing.

7. Where 30 mm and 32 mm Need Extra Caution

The current PerfoMax H22 button-bit page includes 30 and 32 mm inquiry sizes, but the current Y19A, YT28, and YT29A pages begin their listed drilling-diameter ranges at 34 mm. This is a useful example of why catalog availability and machine compatibility must not be merged into one assumption.

If a buyer asks for a 30 or 32 mm H22 button bit, the correct next step is not to reject the size and not to approve it automatically. Instead, identify the exact rock drill and rod system that will use it. There may be other machines or configurations for which the size is appropriate, but that must be confirmed from the relevant equipment/tool documentation.

This distinction is especially important for distributors carrying mixed pneumatic-drill fleets. A warehouse can contain several H22 tools that do not share the same preferred hole range or taper angle. Label inventory by the complete interface and intended machine group, not just by “H22.”

8. Common H22 Button Bit Ordering Mistakes

• Ordering only “H22 + diameter.” The taper angle and exact drill/rod system are still unknown.
• Assuming every 30–40 mm bit fits every H22 rock drill. Current PerfoMax product pages already show different drill-diameter ranges.
• Confusing hole range with guaranteed compatibility. A number that falls inside a range is only a screening check.
• Ignoring model suffixes. Some pneumatic-drill families contain variants that should not be treated as one specification.
• Using the bit catalog to choose the machine. The installed drill and job requirement should constrain the bit, not the other way around.
• Assuming larger diameter is automatically more productive. Productivity depends on the complete drilling system and ground condition.
• Mixing bit-style selection with diameter selection. A correct size can still be the wrong bit style for the application.

9. What to Send in an H22 Tapered Button Bit RFQ

For a faster and safer quotation, send:

• rock-drill manufacturer, exact model, and suffix/variant if applicable;
• current shank or drill-steel identification, including H22 × 108 mm if confirmed;
• current rod length and taper angle;
• required bit diameter and finished hole diameter;
• current bit photos, markings, and clear photos of the rod taper if available;
• rock type or a practical description of strength, abrasiveness, and fracture condition;
• dry or wet drilling condition and flushing arrangement;
• typical hole depth and drilling direction;
• required quantity, destination, packaging, and inspection/document requirements.

If the taper angle is unknown, do not guess it from appearance. Send the existing rod/bit markings, dimensions, and photos so the connection can be verified before quotation.

FAQ

Does “H22” tell me what bit diameter to buy?

No. H22 identifies the drill-steel family, while bit diameter must be chosen from the required hole size and the rock drill’s approved/reference range. Taper angle must also be confirmed separately.

Can the same H22 rod use any 30–40 mm button bit?

Not automatically. The bit must match the rod’s taper connection, and the complete rod/bit combination must be suitable for the installed rock drill and drilling application.

Can I use a 30 or 32 mm H22 button bit on a Y19A or YT28?

Do not approve that combination from “H22” alone. PerfoMax’s current Y19A and YT28 pages list reference hole ranges beginning at 34 mm, while the H22 bit page also lists 30 and 32 mm as inquiry sizes. Verify the exact machine and tool configuration before ordering.

Is 40 mm always slower than 34 mm?

No universal rule should be used. Diameter changes the drilling task, but actual penetration and tool life also depend on the rock drill, operating parameters, bit design, flushing, wear condition, and ground.

What if the old bit and rod have no readable markings?

Send clear photos of both components, the rock-drill nameplate/model, measured dimensions, target hole size, and any historical purchase drawing or part number. Treat the interface as unconfirmed until the taper and drill-steel configuration are identified.

PerfoMax H22 Tapered Button Bits

PerfoMax’s current H22 Taper Button Bits, 30–40 mm page lists 30, 32, 34, 36, 38, and 40 mm inquiry sizes for matching H22 tapered drill-rod systems. The exact taper angle must be confirmed before quotation.

For an 11° configuration, see the current H22 × 108 mm Tapered Drill Rod — 11° Connection Option. For a broader comparison of taper families, read 7° vs 11° vs 12° Tapered Drill Rods and Bits: H22 Compatibility Guide.

If you are replacing an existing bit or standardizing a mixed H22 fleet, send PerfoMax your rock-drill model, current rod/bit information, taper evidence, target hole size, and quantity for RFQ review.

Technical Reference

• Sandvik — Tapered Bits: current manufacturer reference for tapered-bit diameter range, taper families, and handheld/bench/quarrying/bolting applications.