Quick answer: choose H22 tapered drill rod length from the required drilling reach, rock-drill/feed arrangement, working clearance, handling conditions and the supplier’s stated length basis—not from the “H22 × 108” designation. On PerfoMax’s current H22 product page, H22 × 108 mm identifies the rod/shank interface class, while the listed rod-length inquiry options are 600, 800, 1000, 1200, 1600, 1800, 2000 and 2400 mm. The same page currently specifies an 11° tapered bit connection.
For buyers, the practical mistake to avoid is ordering “the longest H22 rod available” without checking the drill, workspace and measurement basis. A longer rod gives more physical reach, but it also needs more operating and handling space and does not correct poor collaring, excessive feed or alignment problems. Final dimensions, tolerances and whether the quoted length is overall or effective should be controlled by the quotation drawing or data sheet.
1. What Does H22 × 108 mm Actually Mean?
H22 × 108 mm is not the total rod length. In this tooling family, H22 describes the nominal 22 mm hexagonal drill-steel section, while 108 mm refers to the shank/interface length class used at the rock-drill end. Rod length is a separate order variable.
This distinction matters because a purchase request such as “H22 × 108, 11°” still does not tell the supplier whether you need a 600 mm rod, a 1200 mm rod or a 2400 mm rod. ISO 1718:1991 covers drill rods with tapered connections for percussive drilling and treats the rod and tapered connection as defined dimensions rather than collapsing every dimension into one product name. Epiroc likewise publishes tapered-tool data with taper angle and rod length as separate parameters.
| Specification | What it controls | PerfoMax current page |
|---|---|---|
| H22 | Nominal hexagonal rod section / drill interface family | H22 |
| 108 mm class | Rock-drill shank/interface class | 108 mm class |
| 11° taper | Rod-to-bit taper connection | 11° option on this product page |
| Rod length | Physical drilling/handling length ordered | 600–2400 mm listed inquiry options |
2. Current PerfoMax H22 Rod Length Options
The current PerfoMax H22 × 108 mm tapered drill rod page lists eight inquiry lengths. These are useful starting options, but the written quotation and attached drawing/data sheet should control the supplied configuration.
| Listed rod length | Buyer should confirm | Typical selection question |
|---|---|---|
| 600 mm | Overall vs effective length, clearance, taper-end dimensions | Is the work area or required drilling stage very short? |
| 800 mm | Same checks plus drill/feed compatibility | Do you need compact handling with slightly more reach? |
| 1000 mm | Length basis, straightness, flushing passage | Does this fit the planned hole stage and available space? |
| 1200 mm | Machine interface and practical handling | Is a mid-range rod appropriate for the site’s normal drilling cycle? |
| 1600 mm | Clearance, alignment, operator/air-leg handling | Can the drill be positioned and collared correctly with this length? |
| 1800 mm | Same checks plus planned hole angle and support | Does the site have enough room for controlled setup and withdrawal? |
| 2000 mm | Drawing, effective reach, handling and straightness | Is the added reach actually required by the drilling plan? |
| 2400 mm | Full system and site-clearance confirmation | Can the longest listed option be handled without compromising alignment? |
Important: the table above is a decision framework, not a universal “length-to-hole-depth” prescription. Sites can use different drilling practices, feed arrangements and length conventions. Confirm the exact basis before ordering.
3. Should Drill Rod Length Equal Hole Depth?
Not automatically. Nominal rod length, effective drilling reach and finished hole depth are related but are not necessarily the same number. Part of the rod is engaged at the rock-drill end, the bit occupies length at the front, and suppliers can describe rod length using different reference points. PerfoMax therefore requires confirmation of overall versus effective length and tolerance before quotation.
Also, an H22 tapered rod is not the same architecture as a threaded R32/T38/T45 extension-rod string. Do not assume you can simply add a coupling sleeve and extend a tapered rod in the same way as a threaded extension system. If the required hole is deeper than the practical reach of one tapered rod, follow the drill/tool manufacturer’s approved drilling sequence and confirm the intended rod set with the supplier.
4. Six Variables That Should Decide H22 Rod Length
1) Target hole depth and drilling sequence
Start from the actual blast-hole, anchor-hole or quarry-hole plan. Record target depth, hole angle and whether the operation uses one rod length or an established sequence of tapered steels. The goal is not to maximize rod length; it is to choose a length that fits the drilling method without creating unnecessary handling difficulty.
2) Rock drill, air leg and available travel
Confirm the exact rock-drill model and its H22 × 108 interface before considering length. Then check how the machine and air leg are positioned through the drilling stroke. Two sites using the same YT-series rock drill can still have different practical length limits because working space, mounting position, feed stroke and operator access differ.
3) Working clearance
Underground headings, narrow drifts, trenches and confined construction work can limit how much rod can be inserted, collared and withdrawn safely. A rod that is theoretically long enough for the hole is not useful if it cannot be brought into line with the drill.
4) Collaring, alignment and feed control
Length selection cannot compensate for poor drilling setup. Boart Longyear’s top-hammer guidance identifies uneven collaring surfaces and excessive feed pressure as causes of drill-string bending and hole deviation. If a site already has deviation or rod-bending problems, do not treat a longer rod as the cure. First correct collaring, alignment, support and feed practice according to the drill/tool instructions.
5) Rock condition and taper system
Rod length is only one part of the tool system. Epiroc’s current tapered-drill-string information separates 4°46′, 7°, 11° and 12° systems by application, rock condition, hole diameter and rod-length ranges. For its 11° family, Epiroc lists quarrying/heavy-duty handheld work, hard to very hard rock and deeper or higher-impact drilling as typical application references. That is useful industry context, but it is not a PerfoMax performance guarantee. Your rod and bit still need the same approved taper and the exact site conditions must be checked.
6) Flushing, straightness and condition of the rod
Before changing length, confirm the flushing passage, straightness requirement and rod condition. A longer new rod will not solve poor flushing, a damaged taper, mushroomed shank, bent steel or an incompatible bit. PerfoMax’s product page specifically requires confirmation of the flushing passage, collar/taper dimensions, steel/heat treatment and straightness in the controlled quotation data.
5. A Practical Length-Selection Matrix
The following bands are starting points for discussion, not fixed engineering prescriptions. Select within them only after confirming the drill, hole plan, workspace and supplier drawing.
| Site situation | Length band to evaluate first | Why | Do not ignore |
|---|---|---|---|
| Very confined work or short drilling stage | 600–1000 mm | Easier insertion, positioning and handling where space is limited | Required hole reach and whether repeated repositioning is acceptable |
| General air-leg work with moderate space | 1000–1600 mm | Balances reach with manageable setup for many small-hole applications | Actual drill/leg geometry, hole angle and site procedure |
| Open face with longer planned drilling stage | 1600–2400 mm | Provides greater physical reach per rod | Collaring control, alignment, withdrawal room and operator handling |
| Broken ground or recurring deviation | Do not select by length alone | Deviation is a system problem involving collaring, feed, geology and tooling | Correct root cause before changing rod length |
6. Seven-Step Workflow Before Ordering
- Identify the rock drill. Record the manufacturer/model and confirm the required H22 × 108 shank/interface class.
- Confirm the bit connection. PerfoMax’s current product page is for an 11° taper option; the bit must match that taper.
- Define the hole plan. Give target hole diameter, depth, angle, rock type and whether work is underground, quarry, construction or another application.
- Check physical clearance. Measure the space available to align, insert, collar, drill and withdraw the rod.
- Choose a candidate length. Select the minimum practical length or established rod sequence that achieves the planned drilling stage without forcing awkward handling or poor alignment.
- Confirm the measurement basis. Ask whether the quoted value is overall length, effective length or another controlled dimension and request the tolerance.
- Approve the drawing/data sheet. Confirm length, taper, collar, flushing passage, straightness and any per-variant dimensions before the PO is finalized.
7. Common Procurement Mistakes
| Mistake | Why it creates risk | Better control |
|---|---|---|
| Reading “H22 × 108” as a 108 mm rod | 108 mm refers to the shank/interface class, not the ordered rod length | Specify H22 × 108 plus the separate rod length |
| Ordering by length only | The shank and taper can still be wrong | Specify drill model, H22 × 108, taper angle and length together |
| Assuming nominal length equals finished hole depth | Engagement, bit length and measurement conventions affect effective reach | Confirm overall/effective length and drilling sequence |
| Choosing the longest rod “for productivity” | More reach also requires more clearance and disciplined alignment/handling | Choose for the actual drilling stage and site geometry |
| Copying another supplier’s length label | Length reference points and tolerances can differ | Approve a controlled drawing or data sheet |
| Changing rod length to solve deviation | Deviation can come from collaring, feed pressure, geology, bit wear and alignment | Troubleshoot the drilling system first |
8. RFQ Checklist for H22 Tapered Drill Rods
Send the following information so the supplier can check the length together with the interfaces:
- rock-drill make and exact model;
- required shank/interface: H22 × 108 mm;
- required taper angle: 11° for the current PerfoMax product configuration;
- candidate rod length: 600 / 800 / 1000 / 1200 / 1600 / 1800 / 2000 / 2400 mm;
- whether your existing specification uses overall or effective length;
- hole diameter, target depth and drilling angle;
- rock type, fracture condition and water/flushing conditions;
- rock-drill/air-leg setup and available working clearance;
- current bit type and taper angle;
- photos or drawing of the existing rod if this is a replacement order;
- required quantity, inspection documents, packaging and commercial terms.
See the current PerfoMax H22 × 108 mm 11° tapered drill rod. If you are matching the complete small-hole drilling system, also review the Rock Drills collection, Drill Bits collection, or send an RFQ with your existing rod and drill information.
9. Frequently Asked Questions
Does H22 × 108 mean the drill rod is 108 mm long?
No. H22 identifies the nominal hexagonal rod section, and 108 mm identifies the shank/interface length class. The total rod length is a separate specification. PerfoMax currently lists 600–2400 mm rod-length inquiry options on this product page.
What H22 rod length should I use with a YT28 rock drill?
First confirm that the exact YT28 configuration requires H22 × 108 and that the bit taper matches. Then choose length from the hole plan, workspace, air-leg/drill geometry and handling requirements. There is no single universal YT28 rod length that is correct for every face and hole depth.
Can I use the same 11° tapered bit on different H22 rod lengths?
Rod length does not by itself change the 11° taper interface. However, both rod and bit must have the same compatible taper geometry, and the bit diameter/design must still suit the drill and application. Verify the controlled dimensions when mixing brands or replacing an unknown part.
Is a longer H22 rod always faster because it drills deeper?
No. Greater physical reach can reduce some handling changes in an appropriate drilling sequence, but only if the rod fits the workspace and can be collared and aligned correctly. Poor setup or excessive feed can increase bending and deviation regardless of nominal rod length.
Why should I ask whether the quoted length is overall or effective?
Because the number on a supplier list can be measured from different reference points. If you are replacing an existing rod, an apparently identical nominal length can still produce a fit or reach mismatch. A controlled drawing or data sheet removes that ambiguity.
10. Technical References
- ISO 1718:1991 — Rock drilling equipment: drill rods with tapered connection for percussive drilling
- Epiroc — Tapered drill strings: taper angles, applications and rod-length ranges
- Boart Longyear — How to reduce drill hole deviation: collaring and feed-pressure effects
Choose the Length as Part of the System
The lowest-risk H22 rod order is written as a complete interface and operating requirement: rock drill → H22 × 108 shank → rod length → 11° bit taper → hole plan and site conditions. Treating length as a separate choice from the drill and bit is how otherwise-correct components become unusable on site.