1. Start from the hammer, not the bit
Read the exact model and shank designation from the hammer or its manual. The bit you order must name that same shank. A "6 inch" hammer can take several different shank families depending on maker and model.
2. Similar names are not interchangeable
Shank names often differ by one letter or digit. Treat each as a separate specification unless the hammer manufacturer confirms compatibility. Examples (general orientation, not a compatibility chart):
| Shank designation | Typical hammer class | Note |
|---|---|---|
| QL60 | 6 in class | Common high-pressure shank family; check foot-valve requirement of the specific hammer. |
| DHD340 vs DHD340A | 4 in class | Similar names; confirm exact designation and hammer manufacturer before ordering. |
| DHD360 | 6 in class | Not the same as QL60 despite similar class. |
| SD6 | 6 in class | Separate shank family; not interchangeable with QL60 or DHD360. |
| QL80 / DHD380 | 8 in class | Treat as distinct unless the hammer maker confirms in writing. |
3. Check foot valve, face and diameter
Some hammers need a bit with a foot valve; others run valve-less. Then choose face form (flat, concave, convex, drop-centre) for the rock, and a diameter within the hammer's stated bit range — hammer class is not hole size.
4. When unsure, send a photo
A clear photo of the shank splines and the hammer nameplate usually resolves the question. Ask for technical help in the request form.
This guide is general guidance, not a manufacturer compatibility statement.