Dry Cutting Diamond Blade

Product Overview

The GUSHI Dry Cutting Diamond Blade is a hot-pressed sintered diamond saw blade engineered for fast, dry cutting of concrete, brick, block, masonry, granite and tile with hand-held angle grinders and cut-off saws. Available in 4″ (105mm), 4.5″ (115mm), 5″ (125mm), 7″ (180mm) and 9″ (230mm) diameters with 16/20/22.23mm arbors, it uses industrial 40/50 mesh diamond grit in a cobalt-nickel matrix to deliver up to 100× the life of abrasive discs. Manufactured by Huzhou Gu’s Imp. & Exp. Co., Ltd. (founded 2004, ISO 9001:2015, CE and EN13236 certified), it is exported to 20+ countries with an OEM MOQ of 500 pieces.

Every blade core is cut from 65Mn spring steel, laser-stress-relieved and computer-balanced to a runout tolerance of 0.1mm, so the blade runs true at speeds up to 13,300 RPM. The segmented rim geometry — with 8 to 16 segments depending on diameter — creates deep gullets that pull cutting debris away from the kerf, keep the segment edge cool, and prevent glazing on abrasive materials.

GUSHI is one of only 23 Chinese companies that won the U.S. anti-dumping case for diamond blades, exporting under a competitive 6.2% duty rate, and operates a production capacity of 100,000 sets per month. The same factory that supplies your local distributor’s private label also builds the GUSHI-branded range — quality, pricing and lead times are identical.

Dry cutting is a convenience-first technology: no water supply, no slurry cleanup and no freeze risk on winter job sites. If you cut tile, porcelain or engineered quartz, ask about our turbo and continuous-rim versions, or the wet-cutting range, for a chip-free edge.

Full Specifications

How the Dry Cutting Diamond Blade Works

1. Sintered Diamond Segments Do the Cutting

Each segment is a composite of industrial diamond grit (40/50 mesh) and powdered cobalt-nickel metal, compressed and sintered at high temperature. The metal matrix holds each diamond particle in place until it dulls, then erodes to expose a fresh cutting edge — a continuous self-sharpening cycle that keeps the blade aggressive for its entire life. The matrix hardness is tuned per application: softer bond for hard granite, harder bond for soft brick.

2. Segmented Rim Geometry Manages Heat and Debris

The cutting rim is interrupted by 8–16 deep gullets. In dry operation, friction between the segment and the workpiece generates heat at the cut line; the gullets allow the blade to cool on every rotation and give chips a path out of the kerf. This is what makes sustained dry cutting possible without the core overheating, warping or cracking.

3. Thermal Stress Is Engineered Out of the Steel Core

The 65Mn spring steel core is laser-cut with expansion slots and stress-relieved during manufacturing, then computer-balanced to 0.1mm runout. At 13,300 RPM, even a small imbalance creates vibration that wears the spindle bearing and degrades cut quality; the relieved core absorbs differential expansion between the hot cutting edge and the cool center, keeping the blade flat and true.

Key Features Explained

Sintered Metal-Bond Segments with 40/50 Mesh Diamond

Industrial-grade diamond grit is used at a concentration matched to the target material. Compared to cheap electroplated blades, the sintered bond holds grit 8–10× longer and survives the impact loads of masonry cutting. The result is a working life of roughly 300–500 linear meters on a 4–5″ blade and 600–1,000 linear meters on 7–9″ blades.

Deep Gullets for Dry-Cut Cooling

Gullet depth and segment count are calculated per diameter to maximize chip clearance without weakening the rim. Debris is ejected continuously instead of being re-ground, which is why the blade stays cool enough to cut concrete and brick without water — and why porcelain and quartz should be cut wet with a continuous rim instead.

65Mn Spring Steel Core, Stress-Relieved and Balanced

The core is not a stamped blank — it is heat-treated 65Mn spring steel, laser stress-relieved and balanced to a 0.1mm runout tolerance. Operators running at 13,300 RPM get a smooth, vibration-free cut, no premature spindle wear on the angle grinder, and no blade wobble that produces bell-mouthed kerfs.

EN13236 Safety Compliance

The blade is manufactured and tested in line with EN13236, the European safety standard for diamond tools, covering burst speed, balance and core integrity. Max RPM is marked on every blade core, and each batch can be supplied with an SGS inspection report — documentation your compliance team will want before import.

OEM Flexibility: Bond, Color, Logo, Packaging

The same blade platform is built for distributors and brands. You can specify the segment bond for your local material mix, your brand color, laser-etched or printed logo, and packaging from single sleeves to retail blister cards — at the 500-piece MOQ with a 20–30 day lead time.

Blade Size Selection Guide

Match the blade diameter to your machine and job size. The 22.23mm arbor is the angle-grinder standard; 16mm and 20mm bushings are included.

Applications & Suitable Materials

Typical Applications

Suitable Materials

Diamond Blade vs. Abrasive Cutting Disc

Contractors often ask whether to switch from traditional aluminum-oxide abrasive discs to sintered diamond blades for dry cutting. The comparison below is based on 4.5″ blades on the same angle grinder:

Bottom line: For masonry and stone work, a sintered diamond blade pays for itself within the first few jobs — one blade replaces 30–100 abrasive discs. Keep an abrasive disc in the van only for steel and rebar.

How to Use: Step-by-Step Guide

1. Check the blade for damage, cracks or missing segments before every use — never mount a damaged blade.
2. Confirm the blade’s marked max RPM is equal to or higher than your grinder’s no-load speed.
3. Clean the arbor and flanges; mount the blade with the correct orientation (laser mark / logo facing out).
4. Tighten the spindle nut to the grinder manufacturer’s torque spec using the wrench — never hand-tighten.
5. Do a 60-second test run at full speed with the grinder clear of the workpiece; listen for vibration or wobble.
6. Position yourself to the side of the cut plane, never in line with the blade, and wear eye, ear and dust protection.
7. For straight cuts, score a guide line and start cutting with the blade at full speed, feeding gently into the material.
8. Move the blade back and forth in the kerf in a sawing motion to clear chips and let the segment cool.
9. Let the blade cut at its own pace — do not force or twist it; on rebar, slow the feed and keep the cut straight.
10. For deep cuts, work in 10–20mm passes: complete the first pass, then deepen it rather than plunging once.
11. Stop immediately if you see blue discoloration, burning smell or vibration — the segments are glazing or the bond is wrong for the material.
12. After use, let the blade spin down fully, inspect the segments, and store flat in a dry place.

For more guidance, see our related guides on choosing the right diamond saw blade, diamond segment design & selection, and abrasive cutting disc range.

Frequently Asked Questions

OEM & Wholesale Information

Huzhou Gu’s Imp. & Exp. Co., Ltd. has manufactured and exported diamond tools since 2004. The company is one of 23 Chinese manufacturers that won the U.S. anti-dumping case for diamond blades (exporting under a competitive 6.2% duty), and counts distributors in the USA, Canada, Germany, UK, Netherlands, Italy, Portugal, Poland, Czech Republic, Brazil, Chile, Australia and South Africa among its customers — many for more than 10 years. Every 10 pieces of Chinese diamond blades exported to Brazil, 2 come from GUSHI.

Explore our complete range: Diamond Saw Blades, Diamond Cup Wheels, and Diamond Core Drill Bits.

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