A spring washer that is not hard enough lacks tension, the one that is too hard will break on-load.
The correct hardness is important. For this reason we have always annealed our products in-house.
Back in the 50’s we used two annealing ovens which we built ourselves. Today we operate with a fully automated annealing facility day and night.
We keep exact records of the hardness profile for individual product batches. It’s not complicated, others do the same. We, however, are able to adjust customer specific hardness values quickly and flexibly. It is this time advantage that our customers appreciate.