Quick answer: do not identify an old YT24, YT27, YT28 or YT29A rock drill by paint colour, one side photo or one approximate dimension. Start with the exact model suffix and manufacturer marking, then check the same machine against a traceable manual, drawing or purchase record. Measurements and interfaces can narrow the shortlist; when evidence is incomplete or conflicts, the correct result is UNKNOWN.
First: confirm that it is an air-leg rock drill
Photograph the complete drill and its support arrangement before comparing model names. If the machine is hand-held, a pneumatic breaker, or has no confirmable air-leg mounting, do not force it into the four-model shortlist. Use the Hand-Held Pneumatic Rock Drills Collection or ask for manual review.
Take these eight photos before measuring
- complete machine from the left, including the full drill body and air-leg connection;
- complete machine from the right;
- front/chuck and the drill-steel shank interface;
- rear control end, handles and visible control arrangement;
- every nameplate, casting, stamped number, suffix and manufacturer mark;
- air inlet and coupling, with any thread or adapter visible;
- water inlet and flushing connection;
- air-leg model/suffix, mount and hose/control connections.
Isolate and depressurize the equipment before close photography or measurement. Do not disassemble pressure-bearing or internal parts for this guide.
Read markings before comparing dimensions
A sharp photo of the exact model and suffix is more useful than a carefully staged beauty shot. Clean only the accessible surface by the approved site method. Photograph the marking straight-on, then take a wider image that proves where it sits on the same machine. Transcribe every character exactly; do not silently change YT24, YT24C, TY24, YT28 or YT29A into the name you expected.
Use three evidence levels
| Result | What supports it | What you may do next |
|---|---|---|
| A — high-confidence candidate | Readable exact model/suffix and manufacturer plus a traceable document for that maker/version; interfaces and measured fields do not conflict | Send for PerfoMax technical confirmation and a configuration-controlled quotation |
| B — medium-confidence shortlist | No complete marking, but several independent dimensions and interface/control details align with one or two references | Keep the result provisional; collect the missing marking, document or measurement |
| C — weak clue | Colour, silhouette, seller statement, one web photo or one approximate measurement | Use only to decide what evidence to collect next |
| UNKNOWN | Evidence is missing, contradictory, from different machines or from an uncontrolled source | Do not order parts or a replacement by assumed model; request human review |
Reference fields that can narrow the shortlist
These are current PerfoMax page references, not universal dimensions for every historical manufacturer or revision. Measure the drill body on the same basis and show the tape start and end points in the photo.
| Current family | Reference fields | Identification consequence |
|---|---|---|
| YT24 family | H22 × 108 class reference; current inquiry states include YT24C, TY24 and identification required |
YT24 without the exact suffix remains UNKNOWN for model-specific quotation |
| YT27 | 668 × 248 × 202 mm external reference; 27 kg body reference; H22 × 108; 80 × 60 mm cylinder/stroke reference | Several matching fields may create a shortlist; none is standalone identity proof |
| YT28 | 661 mm length; 26 kg body reference; H22 × 108; 80 × 60 mm cylinder/stroke reference | Confirm maker/revision and visible interfaces; do not identify from length or weight alone |
| YT29A | 659 mm length; 26.5–27 kg body reference; H22 × 108; 82 × 60 mm cylinder/stroke reference | The 2 mm length difference from the YT28 reference is too small to be a standalone field check |
Body weight must state whether the air leg, drill steel, hoses, oiler and adapters were removed. Internal cylinder or stroke dimensions should come from a controlled document or qualified inspection record—not from an unsafe teardown performed for this form.
The practical decision path
- Product family: confirm an air-leg drill and collect all eight photos. Otherwise stop.
- Exact marking: record model, suffix, maker, serial/batch and every uncertain character. If YT24 has no suffix, keep UNKNOWN.
- Same-source document: match the maker and exact model/suffix to a traceable manual, drawing, nameplate record or original purchase document.
- Cross-check: compare multiple visible interfaces and correctly measured fields. One match is not enough.
- Conflict test: if any major field contradicts the candidate, stop and return UNKNOWN rather than choosing the nearest model.
- Human confirmation: send the evidence set. Only then move to a model page, replacement proposal or parts review.
Why colour and a 660 mm tape reading are not enough
Paint can be changed and covers can be replaced. Historical suppliers may also use different castings or accessories under similar family names. The current YT28 and YT29A page references are 661 mm and 659 mm long—a difference that can disappear inside measuring-point, wear and field-reading error. Their body-weight references overlap as well. Use those fields to expose contradictions, not to manufacture certainty.
What a useful full-angle photo looks like
Keep the complete body, handle/control end, chuck end and air-leg mount in one frame. Then add separate close images of markings and interfaces. A clean background helps, but identity must come from evidence rather than appearance.
Submit a structured identification request
- company, contact, country and equipment location;
- request type: identification, replacement drill, air leg or parts;
- eight required photos, all confirmed to show the same machine;
- exact text visible on every plate, casting and stamped area;
- manufacturer, suffix, serial/batch and any original order reference;
- manual/drawing title and revision, if available;
- body length, width, height and body-only weight with measurement photos;
- chuck/shank, air-leg mount, air inlet, water inlet and control details;
- known conflict or missing evidence, quantity, destination and required response.
Send the evidence set for human identification review. PerfoMax can return a high-confidence candidate, a narrower shortlist, or the exact additional evidence needed. UNKNOWN is an acceptable result when the machine cannot yet be identified safely.
Only after identification: open the correct product path
- YT24 family — confirm YT24C or TY24
- YT27 Pneumatic Air-Leg Rock Drill
- YT28 Air-Leg Pneumatic Rock Drill
- YT29A Air-Leg Pneumatic Rock Drill
If the identity is confirmed but the buyer still needs to choose a new working configuration, use the Air-Leg Rock Drill Selection Guide or browse the Air-Leg Rock Drills Collection. Identification and selection are different decisions.
Frequently asked questions
Can you identify my drill from one WhatsApp photo?
Usually not. One photo may suggest the next check, but the review needs markings, both full sides, interfaces, measurement context and any traceable document.
Is a readable YT28 casting enough?
It is strong evidence, but record the manufacturer and check the same maker/version document and visible interfaces before treating it as a high-confidence candidate.
Can I order spare parts after a medium-confidence result?
No. Similar family names do not prove internal-part interchangeability. Parts require a controlled parts reference and exact machine/version mapping.
What if the plate says only YT24?
Keep the exact suffix unresolved. The current PerfoMax YT24 inquiry path distinguishes YT24C, TY24 and identification required; the family name alone is not an orderable identity.
Why would PerfoMax return UNKNOWN?
Because a transparent unknown is safer and more useful than a confident-looking guess that can lead to the wrong drill, air leg or parts.