To identify pneumatic rock drill spare parts correctly, do not send a photo and a model name alone. A usable RFQ should tie every requested item to the exact drill configuration, the correct exploded-view revision, a drawing position, a part number where available, and the required quantity. If any of those identifiers conflict, pause the order and ask the supplier to resolve the mismatch in writing. Model names such as YT28, YT29A, Y24, sinker, jackleg or stoper describe a family or configuration; they do not prove that every internal component is interchangeable.
This guide is for mines, quarries, contractors, distributors and maintenance buyers preparing a spare-parts quotation. It covers identification and procurement control—not teardown dimensions, repair instructions or permission to substitute parts. The machine manual and the supplier's approved drawing for the exact unit remain the controlling references.
The minimum identification chain
A spare part should be traceable through a short chain: machine identity → document revision → drawing position → part description → part number → quantity. Each link answers a different question. The model establishes the product family, while the drawing and its revision establish which configuration the buyer is referencing. The drawing position points to the component's location. The description helps catch obvious errors. The part number is the strongest commercial identifier when it is valid for that revision. Quantity prevents confusion between a single item and the number used in one assembly.
| RFQ field | What it proves | Common weak entry | Better entry |
|---|---|---|---|
| Drill identity | Which product family and configuration are in service | “YT rock drill” | Full model, nameplate photo, machine ID and known configuration |
| Document identity | Which parts list or exploded view is being used | Unlabeled screenshot | Manual title, publication number, date or revision |
| Drawing position | Where the item appears in the assembly | “The small spring” | Item or reference number plus a marked drawing |
| Part number | The supplier's ordering identifier | Handwritten number with no source | Part number copied from the matching parts list |
| Description | A cross-check on function and location | “Valve part” | Manual description, such as valve seat or throttle valve |
| Quantity | How many pieces are required | “One set” | Pieces per machine × machines serviced + agreed spare allowance |
Step 1: identify the complete drill before identifying the part
Start with the machine, not the loose component. Photograph the nameplate or stamped identification area in good light. Record the complete model exactly as shown, including suffixes, letters and spacing. Add the machine serial number or internal asset number if present. If the drill has been rebuilt from more than one donor machine, state that clearly; the nameplate may no longer describe every installed subassembly.
Then record the configuration details that can change the parts list. Depending on the drill family, these can include chuck or shank size, wet or dry flushing, hand-held versus air-leg arrangement, throttle and handle form, muffler or vibration-reduction option, air-leg connection, and any known production revision. Do not infer these details from paint color or overall appearance.
Useful evidence photographs
- One full-machine view from each side.
- A close, square-on image of the nameplate or stamped model.
- The front head, chuck and retainer area.
- The backhead, throttle and air-inlet arrangement.
- The water connection or flushing arrangement where applicable.
- The suspect part next to a ruler or caliper only when the measurement method is clear.
Photos are supporting evidence, not a substitute for a drawing reference. Perspective, wear, prior machining and scale can make two different parts look alike.
Step 2: control the manual and drawing revision
Ask which document governs the order. A useful parts list carries a title, model coverage, publication number, revision or date, and an exploded view linked to a parts table. Save the complete page or PDF rather than a cropped image. The crop may remove the model suffix, document date or notes that limit applicability.
When a supplier sends a different drawing, compare the revision before accepting it. A newer date does not automatically prove that it applies to an older machine. The correct question is: Which drawing revision covers this serial number or configuration, and what changed from the drawing used by the buyer?
| Document situation | Buyer action |
|---|---|
| Part number and drawing position agree | Proceed to description, quantity and supplier confirmation. |
| Position agrees but part number differs | Request a supersession record or written cross-reference. |
| Part number agrees but description differs | Stop; verify transcription, model and revision. |
| No part number is shown | Use model, drawing revision, position, description, marked image and dimensions agreed with the supplier. |
| Only a loose sample is available | Treat the sample as evidence, not proof; record where it was removed and preserve it until approval. |
Step 3: distinguish position numbers from ordering numbers
A number beside a component in an exploded view is often a reference or item number, not the number used to order the part. The matching table may list a separate ordering number. Copying the drawing position into the purchase order can produce a meaningless or wrong request.
Also check whether the table describes an individual component or an assembly. A handle, valve case, front head or service kit may include smaller items. Ordering both the assembly and every included component can duplicate material; ordering only a subcomponent may leave the maintenance team without seals, springs or fasteners needed to complete the work. Ask the supplier to state inclusions and exclusions on the quotation.
Step 4: handle superseded and equivalent parts without guessing
Part numbers can be superseded, but a supersession is not the same as visual similarity. Require the supplier to show the old number, new number and affected models or serial range. If installation requires another component, modified clearance, different fastener or updated procedure, that dependency belongs in the quotation.
For an aftermarket or approved-equivalent offer, request a structured cross-reference. It should identify the buyer's reference number, the offered supplier number, the exact application, material or heat-treatment control where relevant, critical interface dimensions, and the supplier's evidence of interchangeability. A statement such as “fits YT28” is too broad when multiple factories or revisions use the same family name.
Parts that deserve extra caution
Interfaces and dynamically loaded parts require stronger confirmation than simple external hardware. Examples include pistons, cylinders, valves and valve seats, rifle bars, ratchet components, chucks, chuck bushings, front heads, retainers, air and water connections, seals, springs and through-bolts. The exact risk differs by design, so the approved manual and supplier confirmation should control the decision.
Turn the parts list into an approved service-kit scope
A correctly identified part is not automatically a justified kit item. Before requesting a “seal kit,” “repair kit” or “critical-spares set,” link every line to a defined maintenance event and exact machine configuration. This prevents a convenient bundle from mixing incompatible revisions, hiding unneeded items or omitting a low-cost component that can stop a repair.
Keep this decision separate from warehouse reorder-point calculations. This section defines what belongs in one approved service scope. The published inventory-planning guide owns reorder points, safety stock and min-max levels after the part identity and kit scope are controlled.
| Kit-scope class | Include when | Evidence required | Buyer action |
|---|---|---|---|
| Planned-intervention item | The approved maintenance instruction calls for replacement or inspection during the named repair event. | Exact model/revision, maintenance event, drawing position, part number and quantity per event. | Quote as a traceable line or documented sub-kit. |
| Failure-critical spare | A credible single failure can stop the drill and the site cannot restore service inside the accepted downtime window. | Fleet count, failure/usage record, current usable stock, repair route and replenishment lead time. | Review as a separately controlled critical spare; do not hide it inside a generic kit. |
| Condition-dependent item | Replacement depends on measured wear, damage or workshop findings. | Inspection criterion, disposition authority and an agreed quotation option. | Quote as optional or provisional stock, not as an automatic consumption quantity. |
| Workshop-controlled component | Installation, fitting or verification requires qualified repair capability or controlled measurements. | Approved service method, tooling/measurement requirement and responsible repair location. | Confirm capability before ordering quantity; route unsupported work to a qualified repair facility. |
| Excluded or unresolved item | The model, revision, supersession, kit contents or interchangeability is not proven. | Missing evidence listed explicitly. | Hold the line; do not substitute or combine it with another model. |
Use one calculation per approved maintenance event
For a planned repair scope, calculate each line independently:
Planned line quantity = quantity per approved event × planned events + approved contingency − usable on-hand stock − confirmed open receipts.
The formula does not create a universal spare quantity. “Quantity per approved event” must come from the controlling parts list, kit contents list or maintenance instruction for the exact drill configuration. “Planned events” comes from the buyer’s maintenance plan. Count only stock that has been identified, inspected and released for that same configuration. Treat unverified loose parts, quarantined stock and unconfirmed purchase orders as unavailable.
Service-kit approval matrix
| Line | Exact drill / revision | Maintenance event or failure | Controlled part identity | Qty per event | Planned events / fleet coverage | Usable stock / open receipts | Calculated request | Status |
|---|---|---|---|---|---|---|---|---|
| 001 | Model, suffix, configuration and document revision | Named service event or documented failure mode | Drawing position, part number, description and supplier cross-reference | Documented pieces | Planned event count or named critical-fleet coverage | Released pieces only | Calculated pieces | READY / HOLD / EXCLUDE |
| 002 | Keep separate when model or revision differs | Do not use “general overhaul” without a defined scope | Record kit inclusions if quoted as an assembly | Documented pieces | Buyer-approved basis | Record each source | Calculated pieces | READY / HOLD / EXCLUDE |
Apply a three-way release gate before the RFQ
- READY TO QUOTE: every line is tied to one exact model/revision, a defined service or downtime need, a controlled part identity, a quantity basis and a stated kit inclusion/exclusion.
- HOLD FOR EVIDENCE: the need is credible, but at least one controlling field—revision, part number, quantity per event, supersession, kit contents, usable stock or lead time—remains unresolved.
- DO NOT CONSOLIDATE: lines from different drill configurations are being combined only because their descriptions or photos look similar. Separate them until written interchangeability evidence is approved.
Record the decision with: site and fleet ID; exact drill models and revisions; maintenance event; governing manual or drawing; kit name and supplier number if any; complete contents and piece counts; current released stock; planned events or downtime basis; exclusions; approver; quotation revision; and date. That record lets procurement compare offers without losing the maintenance reasoning behind the quantity.
Step 5: build a line-item RFQ instead of a photo bundle
Use one row per requested item. Attach photographs and marked drawings as evidence, but keep the commercial request in a table that can be quoted, checked and transferred into a purchase order.
| Line | Machine | Document / revision | Drawing position | Buyer part number | Description | Quantity | Supplier response |
|---|---|---|---|---|---|---|---|
| 001 | Exact model and configuration | Manual ID and date | Reference item | Number from list | Manual wording | Pieces | Offered number, compatibility status and notes |
| 002 | Exact model and configuration | Manual ID and date | Reference item | Number from list | Manual wording | Pieces | Offered number, compatibility status and notes |
Add the number of drills in service, planned overhaul quantity, required delivery destination, requested Incoterm, packaging needs and preferred delivery split. For kits, ask for a kit contents list and piece count. For mixed-model fleets, do not combine parts into one unlabeled total; separate demand by model and revision.
Receiving checks should mirror the RFQ
The same identifiers used to buy the part should be available when it arrives. Check the package label and packing list against the purchase-order line, supplier part number and quantity. Keep different part numbers or revisions segregated. Photograph labels before unpacking if traceability matters.
Visual and dimensional checks should follow the agreed inspection plan and approved drawing. Do not assume a clean surface proves correct material or heat treatment, and do not install a questionable part simply because it fits loosely by hand. Quarantine conflicts and ask the supplier for disposition. Installation and functional testing should be performed by qualified personnel under the machine's service instructions. Disconnect and isolate compressed-air energy before inspection or disassembly; applicable workplace rules and site procedures remain controlling.
Common RFQ mistakes
- Sending only a worn sample: wear can remove the very dimensions needed to identify the original geometry.
- Using a generic model name: suffixes and configuration options may change internal or interface parts.
- Mixing position and part numbers: an exploded-view label may not be an order code.
- Ignoring document revision: a correct number from the wrong parts list can still be wrong for the machine.
- Approving “same as” without evidence: request a written cross-reference and the limits of interchangeability.
- Ordering a “set” with no contents: define every included item and quantity.
- Combining similar machines in one line: separate each model or configuration so the supplier can confirm it independently.
Pre-RFQ checklist
- Full machine model and suffix recorded exactly.
- Nameplate and complete-machine photographs attached.
- Chuck, flushing, handle and air-leg configuration stated where relevant.
- Parts-list title, publication number and revision recorded.
- Drawing position and ordering number kept in separate columns.
- Manual description copied without informal renaming.
- Quantity shown in pieces and linked to the fleet or overhaul plan.
- Assembly or kit inclusions requested.
- Supersession or equivalent-part evidence requested where applicable.
- Packaging, destination and delivery terms stated.
Frequently asked questions
Is the rock drill model enough to order spare parts?
No. The model is the start of identification, not the complete proof. Confirm the configuration, governing parts-list revision, drawing position and ordering number. Add photographs or dimensions when documentation is incomplete.
Can a supplier identify a part from a photo?
A photo can narrow the possibilities, but it should not be the sole acceptance basis. Perspective, wear and similar-looking revisions can mislead. Link the photo to the machine, drawing and measured interfaces.
What if the old part number is no longer available?
Ask for a written supersession showing the old and new numbers, affected models or serial range, and any installation dependencies. Do not replace the number silently on the purchase order.
How should aftermarket parts be quoted?
The quotation should cross-reference the requested number to the offered number and state the exact application, critical interfaces, compatibility evidence and any limitation. Brand-family wording alone is insufficient.
Should seals and small springs be ordered individually or as a kit?
Use the approved parts list and maintenance scope. A kit can simplify overhaul planning, but only if its contents, quantities and applicable model or revision are documented.
Technical reference
- OSHA 29 CFR 1926.302: U.S. requirements covering pneumatic power tools and related compressed-air precautions.
Prepare a traceable spare-parts request
Browse the active Rock Drills collection to confirm the commercial equipment family before preparing the parts request.
If you are sourcing parts for PerfoMax-supported pneumatic drill models, start with the current YT28 air-leg pneumatic rock drill reference page, then send the machine model, nameplate image, parts-list revision, marked drawing, requested quantities and delivery destination. PerfoMax can review the identification package and state what can be quoted; unclear or unsupported substitutions should be resolved before order confirmation.
For the complete-machine specification stage, also use the published air-leg rock drill RFQ checklist. For acceptance planning, see the pneumatic rock drill pre-shipment inspection guide.