Rank #7 in Best Impact Drivers 2026: 10 Ranked, and Why the Torque Number Lies
DCA 20V Brushless Impact Wrench, 682 Nm Loosening
- Rating
- 4.5
- Ratings
- 71
- Rank
- #7
Price and rating as shown on Amazon when we collected them. Both change.
The DCA ADPB520 is a 20V brushless cordless impact wrench with a 1/2-inch hog ring drive, sold at £79.99 with two 4.0Ah batteries and a 2A charger. It sits at number 7 in this guide, with a 4.5 rating from 71 ratings at the time of writing.
What makes it worth reading closely is the arithmetic in its own listing. The same advert quotes 682 Nm for loosening and 520 Nm for tightening, and the specification table gives only one torque figure — 682 Newton Meters, filed under the label Item Torque. The gap between the two numbers is the difference between cracking a seized nut and holding a fixing tight. The weight has the same problem in miniature: the table says 1.91 kg, while a bullet says 2.0 kg with a 4.0Ah battery fitted. Everything on this page — the figures, the description, the rating — comes from the Amazon listing and not from testing of our own, so check the advert itself before you buy.
How those 71 ratings break down
An average hides its own shape. This is the spread behind the 4.5 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £79.99 |
|---|---|
| Rating | 4.5 out of 5 from 71 ratings |
| Loosening torque (as listed) | 682 Nm |
| Tightening torque (as listed) | 520 Nm |
| Item Torque (spec table, as listed) | 682 Newton Meters, the loosening figure, with no tightening figure in the table |
| Torque modes (as listed) | 350 Nm, 420 Nm and 520 Nm, plus a 682 Nm nut-busting setting |
| Weight (as listed) | 1.91 kg in the spec table; 2.0 kg with a 4.0Ah battery in the bullet |
| Drive, body and battery | 1/2 inch hog ring, 152 mm body, 2 x 4.0Ah 20V batteries included |
What it is up against
The rivals it was ranked against in Best Impact Drivers 2026: 10 Ranked, and Why the Torque Number Lies.
Questions people ask
What torque does the DCA ADPB520 produce?
The listing gives two figures: 682 Nm for loosening and 520 Nm for tightening. The specification table records only one of them, 682 Newton Meters under Item Torque.
Why does DCA quote two different torque figures?
According to the advert, 682 Nm is nut-busting torque for cracking loose the toughest seized bolts, while the tightening figure is 520 Nm, reached through the three numbered modes below it.
What do the four torque settings do?
The advert lists 350 Nm for car tyres and equipment, 420 Nm for SUVs, trailers and fence anchors, 520 Nm for trucks, steel structures and farm machinery, plus 682 Nm nut-busting.
How heavy is the DCA ADPB520?
Two figures appear in the same listing: the specification table says 1.91 kg, and a bullet says 2.0 kg with a 4.0Ah battery fitted.
What is included with the DCA ADPB520?
The advert lists the wrench, two 4.0Ah batteries, a 2A charger, a 125 mm extension bar, a bit holder, four 78 mm chrome-molybdenum steel impact sockets (17/19/21/22 mm), a belt clip with two screws, two O-rings and two cylindrical pins.
What sockets and bolts does it suit?
It uses a 1/2 inch hog ring for tool-free socket changes, and the advert states it fits M12 to M20 bolts.
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