# Dong Cheng 20V Brushless Impact Wrench, 910 Nm Loosening

Source: https://www.ranked10.co.uk/home/best-impact-drivers/dong-cheng-20v-impact-wrench
Ranked #9 in "Best Impact Drivers 2026: 10 Ranked, and Why the Torque Number Lies": https://www.ranked10.co.uk/home/best-impact-drivers

- Price: £72.24 (checked on Amazon UK on 2026-09-17)
- Amazon rating: 4.6 from 68 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B0F327LVDQ?tag=ranked10-21

The Dong Cheng 20V brushless impact wrench sits at number 9 in this guide, and it is the cleanest example of the problem the guide is about. The product name leads with "Max 910Nm Loosening Torque". The first bullet then prints both numbers side by side: 698 N.m (515 ft-lbs) of tightening torque and up to 910 N.m (670 ft-lbs) of loosening torque. The specification table agrees with the smaller figure, listing "Item Torque: 698 Newton Meters". No part of the listing claims 910Nm for doing a fixing up — 910Nm is the force quoted for cracking one loose.

It is a 20V brushless tool sold as a kit with a 4.0Ah battery, charger, five impact sockets, an extension bar and a heavy-duty box, at £72.24, rated 4.6 out of 5 from 68 reviews. It has four torque settings — 359, 400, 498 and 698 Nm — so 698Nm only arrives on the top setting, and the three below it sit well under the number that got your attention. There is one more count that does not line up: the star breakdown shown next to the 4.6 adds up to 100 ratings, not the 68 the listing quotes. Everything on this page is taken from the Amazon listing data, not from our own testing.

## Specification

| Field | Value |
|---|---|
| Price | £72.24 |
| Rating | 4.6 out of 5 from 68 reviews (the star breakdown shown adds to 100) |
| Tightening torque (as listed) | 698 Nm / 515 ft-lbs |
| Loosening torque (as listed) | 910 Nm / 670 ft-lbs |
| Torque settings | 4 speeds: 359, 400, 498, 698 Nm, with variable speed trigger |
| Motor and power | Brushless, 20V, 2,200 RPM, 4.0Ah battery and charger included |
| Item weight | 1.9 kg |
| Head style (as listed) | Box End |

## Questions people ask

**What tightening torque does the Dong Cheng 20V impact wrench actually give?**

The listing states 698 N.m (515 ft-lbs) of tightening torque in its first bullet, and its specification table repeats the same figure as "Item Torque: 698 Newton Meters".

**Why does the name say 910Nm then?**

910 N.m (670 ft-lbs) is the loosening torque the listing quotes — the effort for undoing a seized fixing rather than for holding one tight. The listing never claims 910Nm of tightening torque.

**How many torque settings does it have?**

Four: 359, 400, 498 and 698 Nm, selected by the speed control, with a variable speed trigger for finer control.

**What is in the box?**

According to the listing: 1 impact wrench, 1 4.0Ah battery, 1 extension bar, 1 charger, 5 impact sockets, 2 cylindrical pins, 2 O-rings and 1 heavy-duty box.

**Does it plug in, or run on a battery?**

It runs on a 20V battery. The listing describes the brushless motor as 20V and includes a 4.0Ah battery and charger in the kit.

**How is it rated by buyers?**

4.6 out of 5 from 68 customer reviews in the listing data, at a price of £72.24. Note that the star breakdown shown beside it adds up to 100 ratings rather than 68.