1/2" CJBS-1200N.m Impact
- Impact
- 21 volts
- Better rated than 62%
- More reviewed than 57%
A 1/2 inch cordless impact wrench with a 21 volt battery and a torque rating suggested by the model name, built for automotive-grade fastening work.
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How it ranks among the 284 impacts we track
4.7★ across 534 Amazon ratings, Bayesian-smoothed toward the category average.
534 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
1,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 284 impacts we track - how the scorecard works · full impacts data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This is a cordless 1/2 inch impact wrench running on a 21 volt battery, with the model name CJBS-1200N.m indicating a rated torque figure of 1200 newton meters. Brand and seller description fields did not come through cleanly in this listing.
The 1/2 inch drive size and 1200 N.m figure in the model name point to a wrench built for automotive-grade fastening such as lug nuts, rather than light-duty driving. It runs on a 21 volt battery pack, higher voltage than the 18 or 20 volt packs common on many cordless tools, though pack capacity is not specified. No seller description or buyer reviews accompany this listing, so runtime and real-world torque delivery are not covered here.
- 1/2 inch drive size
- 21 volt battery
- 1200 N.m torque figure in model name
- Cordless design
Who it's for
Aimed at anyone needing a cordless impact wrench for automotive work such as wheel changes or undercarriage fasteners. Overkill for light household screw driving.
Strengths and trade-offs
Drawn from this product's published specifications.
- 1/2 inch drive suits automotive-grade fasteners
- 21 volt battery supports higher torque output
- Torque rating in the model name points to serious fastening work
- Battery capacity and included accessories not specified
- Brand field did not populate cleanly on this listing
- No seller description or buyer reviews to confirm real-world performance
Performance notes
A 1/2 inch drive size is standard for lug nuts and similar automotive fasteners, and the 1200 N.m figure in the model name suggests torque output aimed at that kind of work rather than delicate driving. The 21 volt battery is on the higher end of common cordless voltages, which typically supports higher torque output, though actual battery capacity is not listed here.
Specifications
| Brand | 1/2" |
|---|---|
| Model | CJBS-1200N.m |
| Voltage | 21 volts |
Other 1/2" impacts
How it compares
This product against the closest alternatives we track in impacts.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| 1/2" CJBS-1200N.m ImpactThis product | 4.7 / 5 | 534 | 4.2 / 5 |
| DEWALT DCF845B ImpactDeWALT | 4.7 / 5 | 12,700 | 4.5 / 5 |
| Milwaukee 2457-20 ImpactMILWAUKEE | 4.6 / 5 | 8,078 | 4.5 / 5 |
| GEARWRENCH 81270 ImpactGEARWRENCH | 4.7 / 5 | 4,983 | 4.4 / 5 |
| AOBEN AB7331T ImpactAOBEN | 4.4 / 5 | 10,707 | 4.4 / 5 |
Similar impacts from other brands
Questions about the 1/2" CJBS-1200N.m
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What size drive does this impact wrench have?
It has a 1/2 inch drive, standard for automotive fasteners like lug nuts.
What voltage battery does it use?
21 volts.
What does the 1200N.m in the model name refer to?
It appears to indicate the wrench's rated torque output in newton meters, though this comes from the model name rather than a separately listed spec.