Diablo Diamond Blade DMADS0400 4 Inch (Segmented Rim 15250 RPM 2.2mm Kerf 2X Life Cured Concrete Rebar Brick Cinder Block Masonry Cutting)

Diablo DMADS0400 4-Inch Segmented Diamond Masonry Blade

The Diablo DMADS0400 4-Inch Segmented Diamond Masonry Blade is an industrial cut-off disc engineered for rapid wet or dry cutting through cured concrete, concrete with rebar, brick, and cinder block. Rated for high-speed operation up to 15,250 RPM with a 2.2mm (0.087-inch) kerf, this 4-inch hardened steel disc features industrial-grade diamond-matrix tall segments. Compatible with 7/8-inch, 20mm, and 5/8-inch arbors via included bushings, this diamond cut-off wheel delivers up to 2X longer service life than standard segmented blades, solving wheel breakdown, slow cutting rates, and core vibration challenges during angle grinder masonry work.

Best Used For:

• Reinforced Concrete Trenching & Scoring: Slicing narrow control joints and expansion slots in cured concrete slabs containing steel rebar mesh.
• Brick & Cinder Block Trimming: Executing fast, straight crosscuts through structural clay brick, concrete masonry units (CMU), and stone pavers.
• Angle Grinder Masonry Tuckpointing: Removing damaged mortar and raking out joint lines using handheld 4-inch small angle grinders.

Key Performance & Safety Features

• Aggressive Segmented Rim Design: Deep gullets eject concrete slurry and dust rapidly to maintain high-speed material removal rates.
• Taller Industrial Diamond Segments: Optimized diamond matrix distribution provides up to 2X longer cutting life compared to conventional diamond blades.
• 15,250 RPM High-Speed Rating: Reinforced core safety-engineered for high-rpm performance on 4-inch and 4-1/2-inch small angle grinders.
• Hardened Steel Disc Core: Vibration-dampening alloy body absorbs lateral impact and resists warping when striking embedded rebar.
• 0.087-Inch (2.2mm) Kerf Profile: Slim kerf width reduces grinding friction and motor load while maintaining cut line accuracy.
• Multi-Arbor Adapter System: Fits 7/8-inch standard angle grinder shafts, 20mm saw spindles, and 5/8-inch arbors using included flush-fit bushings.

What's Included

• (1) Diablo DMADS0400 4 in. Diamond Segmented Cut-Off Blade
• (1) 20 mm Arbor Adapter Bushing
• (1) 5/8 in. Arbor Adapter Bushing

Technical Specifications

Pro-Tip: When dry cutting dense masonry or concrete with rebar, ease off the feed pressure every 15 to 20 seconds to allow ambient air to cool the diamond segments and clear fine silica dust from the gullets.