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4.5 Inch Cutting Disc: Advantages for Metal & Stainless Steel
The 4.5 inch cutting disc (115 mm) is the best-selling cut-off wheel size worldwide, because the 4-1/2" angle grinder is the most common grinder class on job sites. A quality 4.5 inch cutting disc balances cutting depth, speed and disc life for everyday metal and stainless steel work.
Why Is 4.5 Inch the Most Popular Cutting Disc Size?
- The 4-1/2" angle grinder is the global standard tool for fabrication, construction and repair.
- A 115 mm disc gives roughly 25–30 mm cutting depth — enough for most pipes, profiles, rebar and sheet.
- Discs are inexpensive, widely stocked, and available in thicknesses from 0.8 mm (ultra-thin) to 6.0 mm (grinding).
Advantages of a 4.5 Inch Cutting Disc
- Versatility: one disc covers 90% of daily cutting tasks — steel pipe, angle iron, rebar, threaded rod, sheet metal.
- Ultra-thin options (1.0–1.2 mm): burr-free cutting of stainless steel with minimal heat tint and material loss.
- Speed: 13,300 RPM max speed delivers fast cutting while staying within the 80 m/s safety limit.
- Reinforced safety: double fiberglass mesh construction resists breakage under side load.
- INOX versions: contamination-free cutting for food-grade and architectural stainless work.
Standard Specifications
| Size (mm) | Size (inch) | Type | Max RPM |
|---|---|---|---|
| 115 × 1.0 × 22.2 | 4-1/2" × 1/24" × 7/8" | T41 flat, metal/INOX | 13,300 |
| 115 × 1.2 × 22.2 | 4-1/2" × 3/64" × 7/8" | T41 flat, universal | 13,300 |
| 115 × 1.6 / 2.0 × 22.2 | 4-1/2" × 1/16"–5/64" × 7/8" | T41 heavy-duty | 13,300 |
| 115 × 3.0 × 22.2 | 4-1/2" × 1/8" × 7/8" | T42 cutting & grinding | 13,300 |
| 115 × 6.0 × 22.2 | 4-1/2" × 1/4" × 7/8" | T27 grinding disc | 13,300 |
Choosing the Right 4.5 Inch Disc
- Thin sheet & stainless: 1.0 mm ultra-thin INOX disc (white fused alumina / single crystal corundum).
- General steel & rebar: 1.2–1.6 mm brown fused alumina disc.
- Heavy sections & long life: 2.0–2.5 mm disc with max safety rating.
- Cut + deburr in one step: 3.0 mm T42 dual-purpose disc.
FAQ
What is the difference between a 4.5 inch cutting disc and a grinding disc?
A cutting disc is thin (0.8–2.5 mm) and designed to slice through material. A grinding disc is thick (6 mm) with a depressed center for surface grinding and weld removal. Never grind with a thin cutting disc.
How many cuts can a 4.5 inch cutting disc make?
On 2 mm stainless sheet a premium 1.0 mm disc can exceed 100 cuts; on solid 20 mm rebar expect 15–30 cuts. Abrasive grade is the biggest factor.
Is 115 mm the same as 4.5 inch?
Yes. 115 mm = 4-1/2". Both fit standard 4-1/2" angle grinders with a 22.23 mm (7/8") arbor.
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