How Much Torque Should an Impact Wrench Have? A Purchasing Manager's Take on Metabo HPT Power Tools

I'm the office administrator for a 75-person company. I manage all the maintenance and facilities ordering—roughly $80,000 a year spread across 12 vendors. I report to both operations and finance, so every tool request gets a second look.

If you searched "how much torque should an impact wrench have," you probably want a simple number. Here's the thing: there isn't one. The right torque depends on what you're actually doing. That sounds evasive, but it's true, and it's the reason I'm writing this from a buyer's seat instead of a mechanic's.

When I first started buying tools, I assumed the highest torque rating was the safest choice. Bigger number meant stronger tool. That's what the spec sheets wanted me to think.

Then, in March 2023, I approved a high-torque impact wrench for our maintenance tech. He was removing a rusted suspension bolt on a company van. The wrench made short work of it. Then he used the same setting on a smaller bracket bolt. Snap. (The sound is still in my head.) That repair turned a 45-minute job into a shop visit that cost us $700 and a full day of downtime.

I'm not a mechanic, and I won't pretend to give you torque specs from experience. What I can share is what I learned from spec sheets, invoices, and the tech who had to explain it to me in plain English.

Before you buy, decide which bucket you're actually in. I split this into three because the number changes a lot between them.

• Light maintenance: oil changes, brakes, small fasteners, occasional trailer work. You live in the 250-450 ft-lbs range.
• Professional shop: daily automotive and light truck repairs, suspension work, roadside calls. You need 600-800 ft-lbs and a battery system that keeps up.
• Heavy industrial: commercial vehicles, loaders, large equipment. You're in the 1,000+ ft-lbs class, and weight is a secondary concern.

Scenario 1: Light maintenance and fleet vehicles

If your crew does oil changes, brake pads, and the occasional trailer hitch, a compact 18V impact wrench is usually enough. The smaller size gets into tight spaces, and the lower torque range gives you more margin on aluminum components.

This is where the Metabo HPT 18V lineup made sense for us. Our maintenance tech already had a Metabo HPT 18V drill, so adding the impact wrench meant sharing batteries and chargers instead of maintaining a second system. That might sound minor. It isn't. Batteries usually cost more than the tool over time.

One tool that surprised me here was the ratcheting oil filter pliers. No torque rating. Not impressive on paper. But it took a miserable oil filter job from twenty minutes to five, and it didn't risk stripping the filter housing. Sometimes the right tool isn't the one with the highest number.

Scenario 2: Professional shop and roadside service

For suspension work, trailer wheels, or anything that sees road salt all winter, you want more headroom. Look for 600-800 ft-lbs of nut-busting torque. This is the class where cordless tools replaced most of my air-wrench purchases.

Among the Metabo HPT power tools I compared, the high-torque 18V impact wrench sat right there. It wasn't the lightest option, but it didn't feel like a punishment to carry. More importantly, it had a variable-speed trigger that let the tech feather the throttle on smaller fasteners. That's the spec I look for now.

People also ask me about the XGT chainsaw when they're planning outdoor equipment. It's a solid option, but it's a different battery platform and a different cost. The same logic applies: match the power to the material, and think about battery compatibility before you commit.

Scenario 3: Heavy equipment and industrial maintenance

If you're working on commercial trucks or industrial equipment, you need the heavy hitters. Think 1,000+ ft-lbs. These tools are heavier, hungrier, and priced accordingly. They also turn a five-hour job into an hour-long one.

The counterintuitive part: even with a monster in the drawer, don't use it on small fasteners. That's the mistake I made in 2023. Peak torque isn't the problem. Control is.

The question isn't peak torque. It's controlled torque.

If a wrench doesn't have a good variable-speed trigger or a lower-power mode, the top number on the box can hurt you. I'd rather buy a 600 ft-lbs wrench with great control than a 1,100 ft-lbs wrench with a hair-trigger.

What the torque number actually means

When I compare spec sheets, I ignore adjectives. Per FTC guidelines (ftc.gov), performance claims need evidence. So a manufacturer that publishes a real torque number is giving me something I can verify. That doesn't make it the best tool. It just means I'm starting from data instead of marketing.

Torque ratings on impact wrenches are usually measured in ft-lbs. Some brands also list fastening torque and breakaway torque separately. Breakaway torque is the bigger number and the one that sells tools. Fastening torque matters more for daily work because it tells you what the tool will do when installing fasteners, not just removing rusty ones.

How to tell which scenario you're in

If you're still unsure, ask three questions:

1. What is the smallest common fastener your crew touches? If it's 8mm or 10mm, don't buy a 1,200 ft-lbs monster.
2. What is the biggest monthly job? A trailer tire is not a semi axle. Buy for the heavy job you actually do.
3. What battery platform do you already own? The answer decides more of the cost than the torque number.

When I'm not sure, I buy for the jobs we have, not the jobs we imagine. That's not the popular opinion in tool forums. It also keeps me under budget, which matters when finance reviews the purchase order.

The old rules are shifting

The tool industry has changed since 2020. Five years ago, I would have ordered an air-powered wrench for any serious torque job. Today, the cordless options handle 90% of the jobs we used to drag a compressor for. The fundamentals haven't changed—you still need enough torque and a way to control it—but the execution has.

That doesn't mean everyone needs the newest platform. It does mean some old assumptions are worth questioning. If a cordless 18V tool can do the job, adding a separate air line is wasted money.

Bottom line

So, how much torque should an impact wrench have? For light fleet maintenance, 250-450 ft-lbs. For professional shop and roadside work, 600-800 ft-lbs. For heavy industrial, 1,000+ ft-lbs.

But the number only matters if it matches the work. Buy for the work you do, respect the battery platform, and don't forget the unglamorous tools. A set of ratcheting oil filter pliers will earn its drawer space long before an oversized impact wrench does. (Yes, I just said that.)