There is no dependable three-, six- or twelve-month interval for every shear of a named steel. Two 440C pairs can differ in blade geometry, heat treatment, tension, workload and care. A steel maker’s hardness figure is not a service calendar for the finished scissors. Start with the exact model’s instructions and how it cuts after cleaning and correct tension adjustment.
What to check before booking service
| Observation | Before you assume the edge needs sharpening |
|---|---|
| Hair pulls or folds | Clean and dry the blades, then check tension using the maker’s method. If cutting remains poor, ask for an edge and pivot assessment. |
| A nick, burr or impact mark appears | Stop cutting with the pair and ask the maker or an appropriate specialist whether repair is possible. |
| Rough or noisy closing | Remove hair and residue, inspect the screw and follow the model’s oiling instructions. Persistent roughness may involve the pivot or blade alignment. |
| Cutting remains clean and smooth | Keep cleaning and inspecting it. Do not grind a working edge just because a generic calendar date has arrived. |
Plan for service without inventing an interval
Yasaka’s care guidance says to wipe moisture and dirt away and seek resharpening when sharpness deteriorates. Mizutani’s manual first describes cleaning, oiling and a model-specific tension check, then directs owners to its factory or distributor route if performance does not recover. Those are maker-specific instructions, not a grade-wide promise.
Keep a record of the exact model, previous sharpening and any symptoms. If you depend on one pair for daily work, plan a backup and ask the service provider about turnaround before a busy period. Confirm the method appropriate to the blade geometry and any maker warranty terms before sending the pair away. A material name alone does not tell a sharpener the edge design.