How to Choose an Angle Grinder — Complete UK Buyer's Guide

Angle grinders are one of the most versatile tools in any workshop or site van — but with so many sizes and power ratings available, choosing the right one can be confusing. This guide covers everything you need to know.

What Is an Angle Grinder Used For?

Despite the name, angle grinders do far more than grind. They cut, grind, polish, sand, and sharpen — making them one of the most multi-functional power tools available.

Common uses include:

• Cutting metal, reinforcement bar, and steel sections
• Grinding and dressing welds
• Cutting ceramic tiles and stone
• Polishing metal surfaces
• Removing rust and paint
• Cutting square tube and box section
• Sharpening tools

Disc Size — The Most Important Decision

The disc size determines what the grinder can do and how powerful it needs to be.

115mm (4.5 inch): The most common size for trade and DIY use. Compact, lightweight, and manoeuvrable in tight spaces. Ideal for cutting and grinding jobs where access is limited. The TEH TG11508 750W is a perfect example — compact, affordable, and capable of cutting reinforcement, tiles, square tube, and more.

125mm (5 inch): Slightly larger cutting surface than 115mm — popular in the cordless brushless category. Our TEH LG125 brushless cordless range uses 125mm discs and is compatible with the full TEH 20V battery system.

180mm (7 inch): Heavy-duty professional size. Faster cutting through thick steel sections, larger diameter pipe, and heavy reinforcement bar. The larger disc grinds wider weld seams faster. The TEH TG18016S 1600W is our heavy-duty 180mm model — with soft start for safer, more controlled operation.

Wattage — How Much Power Do You Need?

More wattage means more power under load — essential when cutting thick sections or grinding for extended periods.

Brushless vs Brushed Motors

For cordless angle grinders, brushless motors are the clear upgrade:

• More torque delivered to the disc
• Longer battery runtime per charge
• Less heat generation under sustained use
• Motor lasts far longer — no brushes to wear down

The TEH LG125 brushless cordless range uses brushless motor technology and is available with 2x 4Ah batteries for all-day use without mains power.

Soft Start — What Is It and Do You Need It?

Soft start gradually ramps the motor up to full speed rather than jumping instantly to maximum RPM. This:

• Eliminates the sudden jerk on start-up
• Gives you far greater control when starting cuts
• Reduces stress on the disc and motor
• Particularly important on larger 180mm grinders

The TEH TG18016S 180mm 1600W features soft start — making it significantly safer and easier to control than standard grinders of this size.

Safety — Non-Negotiable Rules:

• Always fit the wheel guard before use
• Always wear safety glasses AND a face shield
• Wear hearing protection, gloves, and appropriate clothing
• Use impact-rated cutting discs — never standard discs
• Never use a damaged or cracked disc
• Never use a cutting disc for grinding or vice versa
• Keep bystanders clear of the working area

TEH Angle Grinder Range:

Browse the full range at tehtools.co.uk