40V vs 20V Impact Wrench (2026): 4 Compared

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40V vs 20V: what the voltage means

Higher voltage can deliver more power, and in this set it does: the 40V Makita lists 2050 N.m in its spec table against 1300 N.m for the 21V Zekkip and 1600 N.m for the 21V no-brand. The two 21V tools list different torque figures themselves, so design matters alongside voltage. Buy the platform you already own batteries for; switching voltages means buying into new batteries and chargers. See 12V vs 20V impact wrench for the smaller end.

The four picks: 40v vs 20v impact wrench

The Makita TW001GZ is the 40V side: a 40Vmax XGT impact wrench with 4 speeds, 1800 rpm and a listed 2050 N.m in the spec table. One caution: the listing description in our data file describes a USB drive, which is clearly mismatched text, so we use only the spec table for this pick. The other three are 20V-class: the Zekkip at 1300 N.m with 2 batteries and 5 sockets, the AIDERAR at 500 N.m for DeWalt 20V batteries with a dual 1/2 and 1/4 inch drive, and the 1600 N.m no-brand with 2 4.0Ah batteries.

Torque compared

Listed torque runs from 500 N.m on the AIDERAR to 2050 N.m on the Makita spec table, with the Zekkip at 1300 N.m and the no-brand at 1600 N.m. For lug nuts and suspension bolts, more is better; the AIDERAR listing aims its 500 N.m at tire removal, rusted bolts and car maintenance. Our impact wrenches for mechanics guide covers pro picks.

Speed, modes and control

Top speed and speed control separate these four as much as torque does. The Zekkip runs a brushless motor to 3500 RPM with 3 forward speed modes (0 to 2500, 0 to 2900 and 0 to 3500 RPM) and 2 reverse modes; once a bolt loosens, it slows on its own so the fastener does not fall off. The SFESGRER offers 4 speeds from 0 to 1800 up to 0 to 3600 RPM with speed that follows trigger pressure, plus 4 modes: lock, fastening, continuous reverse and auto-stop reverse. The AIDERAR is simpler with 2 speeds (970 and 2650 RPM) and 3 smart modes: forward, continuous reverse and auto stop reverse. The Makita lists 4 speeds to 1800 RPM with variable speed. For delicate work, the auto-stop reverse modes on the AIDERAR and SFESGRER are genuinely useful; for raw speed, the Zekkip and SFESGRER lead.

Batteries and platforms

The Zekkip and the no-brand include 2 batteries each; the Makita and the AIDERAR are bare tools for owners of Makita 40V XGT and DeWalt 20V batteries respectively. A bare tool is cheaper only if the batteries are already on the shelf. See cordless impact wrenches for suspension work for hard-use picks.

Bare tool or full kit

A bare tool only saves money if the batteries are already on your shelf. The AIDERAR is built for DeWalt 20V owners: it takes the batteries you already charge, and at 500 N.m it is aimed at tire removal and car maintenance rather than the heaviest work. The Makita is the same story on the 40V XGT platform, needing XGT 40V batteries and the DC40RA charger, both sold separately. The Zekkip and SFESGRER include their own 21V batteries and chargers, so they suit a first cordless impact wrench or a second platform. Add up the cost before buying: two batteries and a charger can exceed the price gap between a bare tool and a full kit.

What is in the box

The two 21V kit picks come ready to work. The Zekkip includes 2 4000mAh batteries, a fast charger, 5 impact sockets (17, 19, 21, 22 and 24 mm), an extension rod, a tool case and a manual. The SFESGRER is the accessory leader here with 29 pieces: 2 4.0Ah batteries, a fast charger, 5 impact sockets (14, 17, 18, 19 and 20 mm), 6 impact screwdrivers, 8 drill bits (3, 4, 5 and 6 mm), 4 hex magnetic sockets (6, 8, 10 and 12 mm), a 1/2-inch hex adapter, a 250 mm universal hose, a shoulder strap and a carrying case, and it converts into a drill and screwdriver for 3-in-1 use. The Makita and AIDERAR are bare tools: the Makita ships with the wrench and a belt clip, the AIDERAR with the wrench alone. If you own no batteries in either platform, the kit picks are the only ones that work out of the box.

Drive size and sockets

All four use a 1/2-inch square drive, the standard for lug nuts and suspension hardware. The AIDERAR adds a 1/4-inch hex chuck alongside the 1/2-inch drive, so it can also run screwdriver bits without an adapter. Socket coverage differs: the Zekkip’s 5 sockets run 17 to 24 mm, the SFESGRER’s 5 run 14 to 20 mm, and the SFESGRER adds hex sockets and drill bits for its 3-in-1 drill and driver modes. The Makita and AIDERAR include no sockets at all, so plan on a socket set if you do not own one.

When 40V wins, when 20V wins

Choose 40V where the listing shows the most torque: the Makita 2050 N.m is the highest here, and it suits a shop already on the 40V XGT platform. Choose 20V-class for battery sharing; the AIDERAR fits DeWalt 20V batteries, while the Zekkip and no-brand include their own 21V batteries. The 21V picks list 500 to 1600 N.m, which their listings aim at car, truck and mower work.

Frequently Asked Questions

Is a 40V impact wrench stronger than a 20V?

In this set, yes: the 40V Makita lists 2050 N.m against 1600 N.m for the strongest 21V pick. The two 21V tools list different torque figures, so voltage is not the whole story.

Can I use DeWalt 20V batteries on these?

The AIDERAR is listed as compatible with DeWalt 20V batteries. The others use their own batteries.

Which pick includes batteries?

The Zekkip and the 1600 N.m no-brand include 2 batteries each. The Makita and AIDERAR are bare tools.

What is the highest torque here?

The Makita spec table lists 2050 N.m, the highest of the four. The listing description is mismatched, so we cite the spec table.

Which has the most speed settings?

The SFESGRER with 4 speeds up to 3600 RPM, followed by the Makita with 4 speeds to 1800 RPM and the Zekkip with 3 forward modes to 3500 RPM. The AIDERAR has 2 speeds.

Do any convert to a drill?

The SFESGRER is listed as 3-in-1: impact wrench, impact drill and power screwdriver, with drill bits and an adapter in the 29-piece set. The AIDERAR’s 1/4-inch hex chuck also takes screwdriver bits.

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