Direct answer: an RFQ that says only “YT28 air-leg rock drill” is not detailed enough for a reliable B2B quotation. Before suppliers quote, lock the drilling application, target hole range, exact rock-drill configuration, shank, drill-steel system, stated test pressure, air consumption, pusher-leg model and interface, flushing arrangement, lubrication, included accessories, spare-parts scope, inspection evidence, packing, quantity and destination.
The reason is simple: two pneumatic rock drills can cover a similar hole range while requiring materially different compressed-air capacity, and a pusher leg that fits one drill family may not fit another. A technically useful RFQ therefore normalizes the whole operating system, not just the model name.
Why a Model Name or Hole Range Is Not Enough
Air-leg rock drills are system tools. Their real performance depends on the drill, pusher leg, compressed-air supply, drill steel, bit, flushing and operating conditions working together.
Published pneumatic underground-drill data illustrates why quote normalization matters: drills can overlap in stated hole range while using materially different air flow at the stated test pressure. Supplier compatibility tables also map particular air-leg configurations to particular drill models rather than treating every leg as universally interchangeable.
For procurement teams, the practical lesson is: do not compare “impact frequency,” “air consumption,” “hole range,” or even pusher-leg size unless the test pressure and configuration are stated. A higher performance number measured under a different pressure is not an apples-to-apples comparison.
The 15-Point Air-Leg Rock Drill RFQ Checklist
| # | RFQ item | What the buyer should specify | Why it matters |
|---|---|---|---|
| 1 | Application and drilling direction | Underground development, quarry, construction, horizontal/inclined/up-hole work, or another defined job. | Support method, feed force, flushing and drill choice depend on how the tool will be used. |
| 2 | Target hole diameter and depth | Typical and maximum hole diameter; typical and maximum depth. | Prevents a supplier from quoting a drill that only overlaps part of the required envelope. |
| 3 | Rock condition | Rock type if known; strength, abrasiveness, fractures and water conditions if available. | Helps evaluate whether the proposed system is appropriate and what wear/spare strategy is needed. |
| 4 | Exact rock-drill model/configuration | Model name plus existing part number, nameplate photo, drawing or current drill photos where possible. | Trade names alone do not always identify every interface or production variant. |
| 5 | Shank dimension | For example H22 × 108 mm where applicable; confirm the actual machine-side shank rather than guessing. | The drill steel must fit the chuck/shank system. |
| 6 | Drill steel and bit-end system | Rod length, hex size, taper angle or threaded interface, and bit diameter/type. | A machine-side H22 shank does not by itself define the bit-end taper. |
| 7 | Reference/test air pressure | State the pressure at which performance values must be compared. | Air consumption, impact frequency and output can change with pressure. |
| 8 | Air consumption and simultaneous drill count | Required L/s, m³/min or CFM at the agreed pressure, plus how many drills will run at once. | Determines compressor and distribution-system demand. |
| 9 | Air hose and connection conditions | Hose ID, approximate hose length, coupling type and expected pressure at the tool inlet. | Pressure loss between compressor and drill can make a correctly sized drill appear weak. |
| 10 | Pusher-leg model and interface | Exact leg family/suffix, mounting interface, feed/travel requirement and physical working envelope. | “FT160” or “pusher leg included” is not enough to prove mechanical and operating compatibility. |
| 11 | Flushing arrangement | Wet or dry drilling; water connection and site water availability where wet drilling is required. | Cuttings removal, dust control and internal configuration depend on the flushing system. |
| 12 | Lubrication arrangement | Integral oiler or in-line oiler, required connection, and supplier-approved rock-drill oil specification. | Pneumatic percussion equipment requires reliable lubrication; do not substitute a universal oil assumption. |
| 13 | Included supply scope | Rock drill, pusher leg, hoses, couplings, oiler, water accessories, handles and any other included items. | Prevents two quotations with very different included scope from looking equivalent. |
| 14 | Spare/service package | Initial service kit, wear parts, recommended critical spares and available service documentation. | Remote sites often lose more money from waiting for a small part than from the part price itself. |
| 15 | Inspection, documents, packing and commercial data | Quantity, destination, required inspection evidence, packing method, document list and applicable trade term. | Locks the acceptance basis and avoids late changes after price agreement. |
Normalize Air-Performance Data Before Comparing Quotes
One of the most common procurement errors is comparing air consumption or impact frequency from datasheets that use different reference pressures.
PerfoMax’s current YT28 product data illustrates why the pressure basis belongs in the RFQ. The current reference table lists different performance values at 0.50 MPa and 0.63 MPa: reference impact frequency is at least 34 Hz and 36 Hz respectively, while reference air consumption is no more than 55 L/s and 81 L/s respectively. These are reference values for the current product page, not universal values for every YT28 on the market. The approved technical data sheet and quotation should control the final order.
| Current PerfoMax YT28 reference item | At 0.50 MPa | At 0.63 MPa | RFQ implication |
|---|---|---|---|
| Impact frequency | ≥34 Hz | ≥36 Hz | State the pressure basis before comparing suppliers. |
| Air consumption | ≤55 L/s | ≤81 L/s | Size the compressor/distribution system to the agreed operating point. |
Also distinguish compressor nameplate output from actual pressure and flow delivered at the drill. Long hoses, undersized lines, restrictions, multiple simultaneous tools and poor fittings can reduce pressure at the tool inlet.
For a deeper compressor-sizing workflow, see the YT28 Air Compressor Sizing Guide.
Lock the Shank and Drill-Steel System Separately
For the current PerfoMax YT28 configuration, the product page specifies an H22 × 108 mm shank and a 34–42 mm hole range. However, H22 × 108 mm identifies the machine-side shank interface; it does not automatically identify the bit-end taper.
The RFQ should therefore include both ends of the system:
- rock-drill chuck/shank interface;
- drill-steel hex and length;
- bit-end taper or thread;
- bit diameter and bit type;
- photos or existing part references when the current configuration is uncertain.
If you are identifying an existing system, use the H22 × 108 Drill Steel Compatibility Guide before finalizing replacement tooling.
Treat the Pusher Leg as a Separate Compatibility Decision
A pusher leg is not simply an accessory that can be selected by visual similarity. It supplies support and feed thrust, and its mounting, controls, travel, retracted/extended length and piston geometry must suit the drill and working space.
Supplier compatibility documentation should map the exact air-leg model or suffix to the intended rock drill. Require that pairing in writing; a family name or visual match is not evidence of mechanical, control or working-envelope compatibility.
PerfoMax’s current FT160-series air-leg page is likewise structured around model matching. “FT160” should be treated as a family reference, not proof that any suffix is interchangeable with any rock drill.
Specify Flushing and Lubrication in the Same RFQ
Two quotations can appear to describe the same rock drill but assume different site services. Clarify whether the job uses water flushing, air flushing or another supplier-approved arrangement, and state what connections/accessories are required.
Lubrication should also be explicit. Pneumatic rock drills require a reliable oil supply. The RFQ should state whether the package needs an in-line oiler or another approved arrangement and should ask the supplier to state the recommended rock-drill oil specification for the actual ambient and operating conditions. Avoid specifying ordinary motor oil by assumption.
Release the Quotation Against a Defined Package Scope
“Complete set” is not a controlled supply description. Before comparing prices, classify each offer as a drill body only, a complete working set, or a site-ready package within the agreed supply boundary. Then require every line below to show the exact model or specification, quantity, inclusion status and responsible party.
A site-ready package does not automatically include the compressor, mine air main, water tank or other site infrastructure. It means that every item inside the written supplier scope is identified and that every buyer-supplied interface is stated clearly enough to verify compatibility before dispatch.
| Package control point | Drill body only | Complete working set | Site-ready package | Evidence required before release |
|---|---|---|---|---|
| Rock drill | Exact drill model/configuration only | Exact model matched to the listed operating set | Exact model plus approved application and interface record | Model or nameplate reference, shank and quoted technical data |
| Air leg | Excluded unless separately listed | Exact family and suffix included | Exact suffix, mounting and working envelope confirmed | Pairing statement, configuration reference and quantity |
| Lubrication | Buyer responsibility unless quoted | Named lubricator or approved arrangement included | Lubricator, connection and required oil specification assigned | Model, connection and supplier instruction reference |
| Air hose, couplings and restraints | Normally excluded | Included only when itemized | Lengths, inside diameter, ends, quantities and responsibility stated; restraints listed where required | Hose/coupling schedule and buyer-versus-supplier boundary |
| Water-flushing items | Normally excluded | Connection accessories itemized | Water hose, fittings, valves and site-supply boundary stated | Connection specification and flushing configuration |
| Drill steel | Excluded unless separately listed | Hex, shank, taper or thread, lengths and quantities stated | Working and change-steel sequence matched to the heading or hole plan | Itemized rod schedule with interface references |
| Bits | Excluded unless separately listed | Connection, diameter, design and quantity stated | Bit schedule matched to the ordered steel and application | Itemized bit schedule and compatibility confirmation |
| Starter spares and service tools | Excluded unless separately listed | Itemized starter kit may be included | Initial stock, special tools and replenishment references assigned | Part-numbered packing list; no unitemized “standard kit” |
| Documents, inspection and packing | Basic ordered-unit documents only | Set-level manual, inspection and packing list defined | Acceptance evidence, marks, packing groups and shipment documents defined | Approved document register and final packing list |
Use a Three-Way Package Decision Gate
| Decision | Use it when | Buyer action |
|---|---|---|
| COMPLETE | Every required line has an exact model/specification, quantity, included/excluded status, responsible party and supporting evidence. | Release the technical scope for commercial comparison or purchase-order approval. |
| CONDITIONAL | One or more items are buyer-supplied, but the boundary and mating interfaces are explicit and verifiable. | Attach the buyer-supplied schedule and close each interface before dispatch. |
| HOLD | The offer uses phrases such as “standard accessories” or “complete set” without an itemized scope, or an air-leg suffix, connection, length or quantity is missing. | Return the quotation for clarification; do not compare its package price as equivalent. |
Copy-Ready Package-Scope Record
For each line, record: item; exact model, suffix or specification; quantity per set; number of sets; total quantity; included or excluded; supplied by seller or buyer; mating interface; inspection evidence; packing mark; open clarification. This creates one controlled record for technical review, quote comparison, order release and receiving inspection.
Minimum Pre-Shipment Evidence to Request
The appropriate inspection plan depends on the order value, risk and contract, but a practical B2B order should normally define what evidence must be available before shipment. Examples include:
- photos of model/nameplate or other ordered-product identification;
- confirmation of the agreed shank and pusher-leg configuration;
- basic functional-test evidence at the agreed reference conditions where included in the contract;
- itemized accessory and spare-parts count;
- packing photos or packing list;
- the agreed technical data sheet, manuals or other documents listed in the purchase order.
Do not assume a generic “QC passed” statement proves a particular dimension or performance condition. Define the acceptance evidence in the RFQ or purchase order before production and shipment.
Common Air-Leg Rock Drill RFQ Mistakes
- Writing only “YT28.” Add shank, air-performance basis, pusher leg, flushing and supply scope.
- Comparing air consumption at different pressures. Normalize the reference pressure first.
- Using hole range as proof of equivalence. Similar hole ranges can hide different air demand and drill architecture.
- Assuming H22 × 108 determines the bit taper. It does not; verify the bit-end interface separately.
- Writing only “FT160 air leg.” Lock the exact suffix/configuration and mounting/interface.
- Ignoring hose pressure loss. A compressor can be large enough on paper while the drill receives inadequate pressure.
- Leaving flushing and lubrication undefined. These are operating-system requirements, not afterthoughts.
- Comparing bare-tool and package prices. Require an included/excluded list.
- Ordering no service parts for a remote site. Define the first maintenance/spares package with the supplier.
- Waiting until shipment to define inspection documents. Put evidence requirements in the RFQ and PO.
Copy This Condensed RFQ Data Sheet
- Application and drilling direction:
- Rock condition:
- Typical / maximum hole diameter:
- Typical / maximum hole depth:
- Required or existing rock-drill model:
- Shank dimension:
- Drill steel length and bit-end connection:
- Reference operating/test pressure:
- Maximum air consumption at that pressure:
- Number of simultaneous drills:
- Air hose ID / length / couplings:
- Pusher-leg exact model/suffix and required travel:
- Flushing and lubrication arrangement:
- Included accessories and spare/service kit:
- Quantity, destination, inspection/documents and packing requirements:
For a current product starting point, review PerfoMax’s Rock Drills collection and YT28 Air-Leg Rock Drill. For a quotation, send the completed application and interface information to PerfoMax so the proposed supply scope can be checked before order confirmation.
Frequently Asked Questions
Is the model name “YT28” enough for an RFQ?
No. It is a useful starting point, but a reliable RFQ should also state the shank/drill-steel system, test pressure, air requirement, pusher-leg configuration, flushing, included scope and application.
What air pressure should I put in the RFQ?
Use the manufacturer- or supplier-approved operating/test basis for the exact drill configuration, then require all compared performance values to state that pressure. Do not combine figures from different pressure bases.
Does H22 × 108 mm tell me which tapered bit to buy?
No. H22 × 108 mm describes the machine-side shank commonly used in this class of drill steel. The bit-end taper or other bit connection must be identified separately.
Are all FT160 air legs interchangeable?
No. Treat FT160 as a family reference. Confirm the exact suffix/configuration, mounting interface, travel and intended rock-drill pairing before ordering.
What should the supplier confirm before I issue the purchase order?
At minimum, confirm the final technical data sheet or approved configuration, model and interfaces, performance reference conditions, included accessories/spares, required inspection/document scope, packing, quantity and delivery terms.