CAT CLASS: HQ-10396

5.5-8 in Angle Grinder

The 5.5–8 in angle grinder class encompasses two-handed tools with 6 to 7 in wheels, designed for deeper cuts and greater surface coverage per pass than compact models. This mid-size band bridges handheld portability and the performance needed for steel preparation and concrete edge work. Operators typically use both hands to control the added torque and weight of these grinders.

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Models

Brands

Cat classes

Pick a size class — capacity and reach differ across the range.

Key specifications

Specification	Typical range	What it means
Wheel diameter	6–7 in (15.2–17.8 cm)	Larger cutting depth and grinding surface area than compact grinders.
Motor design	Corded electric	Common brands include Bosch, Dewalt, and Metabo HPT in this size range.
Operating style	Two-handed	Side handle and body design accommodate controlled two-hand grip for higher torque.

How to choose

The 5.5–8 in band suits applications requiring deeper cuts, faster material removal, or extended edge work on steel and concrete where compact grinders leave too much remaining surface. When the work involves detailed corner access, light-duty surface prep, or extended overhead use, the Up to 5.5 in Angle Grinder class offers better maneuverability and reduced operator fatigue. For heavy fabrication, large-diameter pipe cutting, or high-volume concrete grinding where wheel life and cut depth are priorities, the 8+ in Angle Grinder class delivers greater capacity and reduced cycle time.

What this size handles

Beveling structural steel plate edges before welding
Removing form ties and smoothing concrete slab edges
Cutting rebar and reinforcing mesh in moderate quantities
Surface preparation of steel beams and columns for coating
Grinding weld seams on pipe 4 in diameter and larger
Removing mortar from masonry joints in restoration work

Safety & operation

Wheel guards must remain in place and adjusted to shield operator from debris ejection
Two-handed operation reduces kickback risk; side handle orientation depends on task and operator position
Face shield, hearing protection, and cut-resistant gloves required for grinding and cutting operations
Lock-off switches prevent accidental startup during wheel changes or when setting down the tool

Transport & logistics

Hand-carried to work area; typical weight under 15 lb for corded models
Stored in gang boxes or tool trailers alongside other handheld power tools
Extension cords or portable power distribution required at remote locations

Power & supply

120V or 240V AC electric service, depending on motor amperage and job-site infrastructure
Extension cord length and gauge must match amperage draw to prevent voltage drop
GFCI protection standard on construction sites and near wet conditions

Frequently asked

What differentiates a 6 in grinder from a 7 in model in this class?

The 7 in wheel adds approximately 0.5 in of cutting depth and 15–20% more grinding surface, but increases tool weight and torque reaction. Many operators select 7 in for steel fabrication and 6 in for concrete edge work where maneuverability matters.

Can this size class handle continuous production grinding?

Mid-size angle grinders suit intermittent fabrication and site prep work. Continuous production grinding—such as foundry casting cleanup or high-volume weld finishing—typically demands the thermal capacity and wheel life of 8+ in models or dedicated pedestal grinders.

What wheel types are common in the 6–7 in range?

Type 27 depressed-center wheels for general grinding, Type 1 flat wheels for cutting, and diamond cup wheels for concrete. Wheel bore size (typically 5/8–11 threaded or 7/8 in arbor) must match the grinder spindle.