A safe cutting-disc setup starts with the correct wheel, machine, mounting and workpiece support—not with choosing the thinnest disc or the most powerful grinder. For workshop cutting of approved steel and stainless materials, check these requirements first, then compare cutting time, disc use and the finished edge.
This guide covers portable reinforced resin cut-off wheels. It includes selection points for FUJI Super Raicho 105 x 0.8mm discs, but does not replace the instructions supplied with the exact disc and machine.
| Check | What to confirm before fitting |
|---|---|
| Application | The exact wheel is approved for the workpiece material and for cutting. |
| Dimensions | Outside diameter, thickness and bore match the approved tool arrangement. A 105 x 0.8mm description omits the bore and is not a complete order specification. |
| Speed | The grinder maximum speed does not exceed the wheel maximum RPM. A marking in m/s is peripheral speed, not RPM. |
| Mounting | Use the specified flanges, guard and spindle arrangement. Do not improvise adapters or modify the bore. |
| Condition | Inspect for cracks, chips, distortion and storage damage. Check the label and any service-life marking. |
Motor wattage alone cannot answer whether a 0.8mm disc is compatible with a grinder. A 1500W machine is not automatically suitable, and a corded or high-frequency power supply does not make a wheel immune to breakage. If any part of the combination is unclear, confirm it before use.
Super Raicho 0.8mm is FUJI's thinnest 4-inch cutting disc. This premium ultra-thin wheel is produced using selected Japanese abrasives and resin with a warm-press manufacturing process. It is designed for fast cutting of thin carbon-steel and stainless-steel materials, including suitable sheet and thin-wall sections.
The 0.8mm thickness suits work where a narrow cut and controlled material removal are priorities. Safe use still depends on the approved grinder, correct mounting and guarding, secure workpiece support and a straight cutting action. Do not twist the disc or use its side for grinding.
A thin disc makes a relatively narrow kerf, which can be useful when evaluating cuts in thin-wall tube, sheet and small sections. Actual cutting resistance, heat and edge quality depend on the formulation, workpiece and operating conditions. Thinness alone cannot guarantee burr-free cuts, prevent motor overheating or extend tool life.
The FUJI Super Raicho ultra-thin cutting disc range includes the 0.8mm option. FUJI's Japanese catalogue lists Super Raicho 0.8 at 105 x 0.8 x 15mm. Confirm the full specification of the version supplied for your market; do not assume all machines or all discs in the series use the same bore.
| Situation | Decision to make |
|---|---|
| Thin steel or stainless sections | Evaluate an approved thin-disc specification against the required cut quality and handling control. |
| Thicker sections or extended cuts | Review cutting capacity, machine duty and available approved wheel options; do not choose 0.8mm solely for its narrow kerf. |
| A cut that pinches or deflects the disc | Correct the support and process. Changing thickness does not make twisting or trapped-wheel cutting acceptable. |
| Aluminium, masonry or another material | Use an expressly approved product; do not extend a steel-disc recommendation to other materials. |
Secure and support the workpiece so it cannot shift and the cut will not close on the wheel. Plan for the offcut and spark direction. Remove ignition hazards and protect nearby people. Use the required eye, face, hearing and respiratory protection for the job.
Follow the machine instructions for guard positioning, handling and the pre-use run check. Never remove a guard to fit a larger wheel. Keep the cutting path clear, and do not rest the tool on its disc.
Use the cut-off wheel for cutting only. Do not side-grind, deburr, bend or twist it. Maintain controlled feed without forcing the motor to stall. Stop for abnormal sound, vibration or damage and investigate before restarting. These principles apply to corded and cordless tools alike.
A cutting wheel removes material through abrasive action as its rim enters the workpiece. It still generates heat and cutting forces. Reinforcement supports the designed use; it does not permit lateral loading or eliminate breakage risk.
For surface grinding or weld removal, switch to the appropriate abrasive. Our grinding wheel selection guide distinguishes cutting, grinding and blending operations.
Confirm that the supplied disc is approved for the alloy and the customer's contamination requirements. Do not infer an iron, sulfur or chlorine limit from the abrasive name or disc thickness. Request the relevant product documentation when a numerical limit is specified.
Where the process requires it, keep stainless work separate from carbon-steel abrasives and contact tools. Evaluate burrs, discoloration and any downstream finishing or cleaning. A fast cut is not proof of zero heat transfer or restored corrosion performance.
Compare approved alternatives on the same material grade, section size and accepted edge condition. Record repeated cuts, not just the fastest example. Keep the grinder and operating method consistent, and document the wheel code and batch.
| Measure | Include in the comparison |
|---|---|
| Time per accepted cut | Cutting, necessary finishing and wheel changes. |
| Disc consumption | Disc cost allocated across accepted cuts, using consistent replacement criteria. |
| Quality | Squareness, burr condition, dimensional acceptance and rework. |
| Handling observations | Operator feedback, kept separate from measured vibration or exposure claims. |
Cost per accepted cut = disc cost consumed + labour for cutting and changes + attributable finishing or rework. Purchase price remains part of the calculation, but it is not the only factor.
If one setup takes 5.1 seconds per cut and another takes 3.9 seconds, 100 cuts take 510 seconds (8.5 minutes) and 390 seconds (6.5 minutes). The difference is 120 seconds, or a 23.5% reduction in cutting time. This does not establish the saving over an entire shift, because changes, handling and rework still have to be measured.
| Problem | Review |
|---|---|
| Cutting slows markedly | Material approval, disc condition, section size and tool duty. Do not compensate by forcing the wheel. |
| Heavy burrs or discoloration | Feed control, disc specification, part support and required follow-up work. |
| Disc pinches or tracks sideways | Stop and reassess support and alignment; do not twist the wheel to correct the cut. |
| Unexpected wear | Compare wear with work completed and check the approved operating method. |
| New vibration or damage | Stop, isolate the tool and inspect the disc and mounting according to the instructions. |
No. Compare the full product specification on the actual job. Thickness is one selection variable, not a universal ranking of speed, durability or safety.
No. Check approved disc dimensions, mounting, guard, speed and operation for the exact tool. High-frequency models also need their specified power supply. Frequency or brand alone does not establish disc compatibility.
No. They have rated power, thermal limits and duty requirements. Select between corded, cordless and high-frequency equipment by the task and approved setup.
Do not use its side for grinding or deburring. Use a separate approved grinding or finishing product for that operation.
Review Super Raicho specifications and FUJI angle grinder options as separate compatibility checks. For the Japanese size listing, see the FUJI manufacturer catalogue. General operating precautions are also covered in Norton's portable cut-off wheel guidance.
Send your material grade, section dimensions, grinder model and maximum RPM, current disc label and required edge quality. Describe whether the issue is cutting time, wear, burrs or handling so we can discuss a suitable specification and trial.
