Pliers & cutters
Reading a plier specification: capacity, hardness and why it matters
Cutter specifications look like marketing until you have ruined a pair. Then they read very differently.
Three capacities, not one
A cutter is normally rated for soft, medium and hard wire, and the three figures differ substantially: a plier rated 3.4 mm soft might be rated only 1.8 mm hard.
- Soft wire: copper, aluminium, annealed material
- Medium-hard wire: mild steel, most fasteners and nails
- Hard wire: spring steel, piano wire, hardened material
Edge hardness sets the ceiling
A general-purpose cutting edge sits around 58–62 HRC. Piano wire and spring steel need an induction-hardened edge above 64 HRC.
Cutting hard wire with a soft edge does not blunt it evenly. It puts a discrete notch in the edge at the point of contact, and that notch never comes out. The tool will still cut, badly, forever after.
Flush cutters are a different tool entirely
A flush cutter has no bevel on one face, which is how it leaves a lead cut level with the solder joint. That geometry is fragile by definition.
Single-bevel plastic nippers go further still. Some will not cut any metal at all, and one attempt ends the edge. That is not a defect; it is the trade-off for a cut that needs no sanding afterwards. Keep an ordinary nipper on the bench for everything else.
Joints
A box joint, where one handle passes through a slot in the other, keeps the jaws aligned far better than a lapped or riveted joint. On precision cutters that alignment is what makes a flush cut possible, so it is worth the extra cost.
How we write these. Guides are written by the people who pick and specify these tools. We sell the products mentioned, and we say so, but where the honest answer is that a cheaper tool does the job, that is what the guide says. If you think something here is wrong, tell us at support@exelprod.com and we will correct it and note the change.
