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How to use a DeWalt angle grinder

Updated: October 2026

You are about to fit the first disc on a new DeWalt angle grinder, and the nut in the box may be a hex key rather than the pin spanner you expected. How to use a DeWalt angle grinder, on these four listings, starts with one rule: isolate the tool, match the wheel to that model, put the guard between you and the disc, and stop if the flange will not hold. The [DeWalt angle grinder comparison](/hub/tools/de-walt-angle-grinder) is the table of the DCG406, DCG407, DCG404 and the corded DWE4036. This is not a training course. A qualifying amazon.co.uk purchase can earn us a commission at no extra cost to you.

You are about to fit the first disc on a new DeWalt angle grinder, and the nut in the box may be a hex key rather than the pin spanner you expected.

Our top picks

DeWalt DeWalt DCG406N-XJ

Best overall

DeWalt DeWalt DCG406N-XJ
8.9/10about £131.90
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DeWalt DeWalt DCG404N-XJ

Alternative

DeWalt DeWalt DCG404N-XJ
7.3/10about £188.05
View offer
DeWalt DeWalt DWE4036-GB

Best value

DeWalt DeWalt DWE4036-GB
7.7/10about £59.99
View offer
On this page
  1. 1.Isolate the tool and match the disc
  2. 2.Guard, flanges and the test run
  3. 3.Hands, eyes, ears and clothing
  4. 4.When you should not carry on

Isolate the tool and match the disc

Take the battery off the DCG406, DCG407 and DCG404 before the flange moves. On the DWE4036, pull the BS 1363 plug. A no-volt release means the switch has to be reset after you plug in again. That reset is not isolation. Match the wheel to the plate on that tool. The DWE4036 manual is 115 mm and 11,800 rpm. The cordless titles are 125 mm, and the DCG406 manual states 9,000 rpm with an M14 thread. A cutting wheel is capped at 3 mm and a grinding wheel at 6.4 mm, and a wire wheel at 115 mm, on both of those manuals. If your discs are all 125 mm, the corded body is the wrong choice, which the cordless or corded DeWalt angle grinder page sets out.

Guard, flanges and the test run

Set the guard so it sits between you and the disc. The DWE4036 bullets name a cutting guard and a grinding guard. The DCG404 box lists a clip-on grinding guard, a cutting guard and a hex wrench. Side load is how a thin cutting wheel shatters. A clutch in a bullet does not stand in for the guard. Clean both flanges. Tighten the nut firmly with the supplied key, then stop. These sources do not give a torque figure. UK reviews of the DCG406 describe a speed nut and an Allen key. One DCG407 review and one DWE4036 review describe a nut or flange that loosened. Each is a single report. Run a new disc briefly with nobody in line with the wheel, and stop if it vibrates.
DeWalt DeWalt DCG406N-XJ

Testsieger

DeWalt DeWalt DCG406N-XJ
8.9/10about £131.90
View offer

Hands, eyes, ears and clothing

Clamp the work and keep both hands on the tool. HSE’s HSG17 treats eye protection to BS EN 166, a guard, and clothing without loose cuffs as part of abrasive-wheel work. Sparks stay clear of anything that burns. The DWE4036 manual states a sound power of 102 dB(A). The DCG406 manual states 93 dB(A). The Control of Noise at Work Regulations 2005 set action values at 80 and 85 dB(A) and a limit of 87 dB(A) at work. Gloves do not make a switch safe if the guard is off.

When you should not carry on

At home you do not need a certificate to own one of these grinders. PUWER 1998 puts a training duty on employers, so paid work is the employer’s arrangements. HSG17 is the training guide for people who mount abrasive wheels at work. A long run of concrete is a silica job. A dust mask from a kitchen drawer is not a control for respirable crystalline silica. Stop when a nut has loosened, a flange has let a disc leave, or a guard has broken. One DCG406 review describes the motor cutting out after overheating. Let it cool. Disc size and supply sit in the DeWalt angle grinder buying guide. Who each listing is for sits on the best DeWalt angle grinder page.

Common questions

Do I unplug it or take the battery off before the disc?
Take the battery off the DCG406, DCG407 and DCG404 before you touch the nut. Unplug the DWE4036. Its no-volt release does not replace that step. Electrical Safety First gives the same isolation for a UK mains grinder. A switch in the off position is not a battery on the bench or a plug in your hand.
Which guard for cutting?
Use the cutting guard, set so it sits between you and the disc. The DWE4036 bullets name a cutting guard and a grinding guard as separate items, and the DCG404 list does the same. The grinding guard belongs with a grinding wheel. Keep bystanders out of the plane of the wheel while you test-run a new disc.
Can I grind with a cutting disc?
No. On the DCG406 and DWE4036 manuals the cutting wheel is capped at 3 mm thick, and the grinding wheel at 6.4 mm. Side pressure is how a cutting disc shatters. Fit a grinding wheel and the grinding guard when you need to remove material from a face.
Why is there an Allen key instead of a pin spanner?
UK reviews of the DCG406 describe a speed nut and an Allen key, and the DCG404 box list includes a hex wrench. Tighten with the supplied key until the nut is firm, on clean flanges. If a key in the box does not fit, stop before you force it.
How tight should the nut be?
Firm, with the supplied key, on clean flanges. These manuals do not give a torque figure. Overtightening can damage the flange, and undertightening is how a disc walks. After a short test run, if the nut has moved, stop. Treat that as the end of the session.
Do I need a training certificate at home?
For a tool you use at home, PUWER’s training duty is not a household licence. You still isolate the grinder, fit the correct guard and disc, and wear eye protection. The duty lands when the grinder is work equipment. On a site, follow that site’s rules.
What PPE is the minimum?
BS EN 166 eye protection, hearing protection, and clothing without loose cuffs. HSG17 and Electrical Safety First both put the guard on and the work clamped. Declared sound power is 102 dB(A) on the DWE4036 and 93 dB(A) on the DCG406. Add dust controls for masonry or concrete dust.
What do I do if the nut will not stay tight?
Stop using the grinder. Clean the flanges, confirm the wheel’s bore and thickness, and refit once with the supplied key. If the nut loosens again, that tool is finished for the day. One DWE4036 review and one DCG407 review describe that failure. A clutch does not replace a flange that will not hold.

Related pages

DeWalt angle grinder battery runtime

DeWalt angle grinder

Best DeWalt angle grinder for packs, socket or site

DeWalt angle grinder buying guide for disc and box

Cordless or corded DeWalt angle grinder, 230 V or 18 V

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the four amazon.co.uk listings captured on 19 October 2026. PUWER, vibration and noise limits apply at work. They are not a certificate for a domestic grinder. There is no laboratory test.

  1. HSE, HSG17 Safety in the use of abrasive wheels (retrieved 19 October 2026)
  2. legislation.gov.uk, PUWER 1998 (retrieved 19 October 2026)
  3. legislation.gov.uk, Control of Vibration at Work Regulations 2005 (retrieved 19 October 2026)
  4. legislation.gov.uk, Control of Noise at Work Regulations 2005 (retrieved 19 October 2026)
  5. HSE, Electrical systems on construction sites (retrieved 19 October 2026)
  6. GOV.UK, Supply of Machinery (Safety) Regulations 2008 (retrieved 19 October 2026)
  7. DeWalt, DCG406 instruction manual (retrieved 19 October 2026)
  8. DeWalt, DWE4036 instruction manual (retrieved 19 October 2026)