Shank diameter is the fitment. A chisel will only enter a hammer built for its shank, and the 1/2 inch 12.7mm size runs through the Chicago Pneumatic B-series here. Once the shank matches, stroke length and blows per minute decide the character of the tool: a long stroke hits harder and slower, which suits breaking a joint, and a short stroke hits faster and lighter, which suits dressing and cutting.
The vibro impact family works on a different principle from a plain chisel hammer. Instead of driving a chisel into the work, it delivers rapid impact into a seized fixing so that the shock breaks the joint rather than the fastener. Sykes Pickavant hold this ground with the 90206000 and the heavy duty 90245000, both taking chisel and hammer insert variants.
Rivet hammers are graded by type rather than by dimension. The Chicago Pneumatic CP428x series runs 1X through 7X, the number rising with the rivet being set, and the type is the whole selection once the shank is right. A chipping hammer and an impact driver for corroded screws sit alongside for the jobs a chisel will not do. Type is read off the old hammer or off the rivet itself rather than measured, and a hammer bought a size out will either fail to set the rivet or deform its head.
Blows per minute and stroke are stated per tool so the two can be read together, and replacement hammer sets are held for the tools that take them. For an unmarked hammer or an older tool, a photo over WhatsApp on 07754288583 identifies the shank and the insert it takes. The PCL APT517 sits alongside the CP and Sykes bodies, and the Sealey SA120 chipping hammer covers scale removal that a chisel would gouge.
| Model No | VS0291 |
|---|---|
| Brand | Sealey |
| Nett Weight | 0.20kg |
| Shank Size | .401" Parker Taper |
| Bit Size | 5/16"(8mm), Bits not included |
| Model No | SA120 |
|---|---|
| Air Consumption | 4cfm |
| Brand | Sealey |
| Chisel Shank Size | 12.7 x 47mm |
| Consumable Parts | SA120/21 - Replacement Spring Retainer, SA120/F - Flat Chisel, SA120/P - Pointed Chisel |
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