Stihl BT 131 Earth Auger Review

Stihl BT 131 Earth Auger Review
PTR Review
  • Pro Review 9.0

Stihl puts together a really well-thought out and refined machine with their BT 131 Earth Auger. It sits at the top of the high-end market with a lower price than Echo and has the features and performance to warrant upgrading from the value brands.

Overall Score 9.0 (out of 10)

The Stihl BT 131 Earth Auger is the company’s biggest and most powerful hole-drilling tool for applications from construction to ice fishing. Let’s in-auger-ate some holes in the Earth and see how it does!


  • Large fuel tank gives you more time between refuels
  • Hip pad offers some comfort and puts a barrier between you and the motor
  • QuickStop brake prevents injury in a bind up
  • Vibration dampening system
  • The pistol-grip throttle is much more comfortable than motorcycle-grip style
  • Surprisingly lightweight, compact, and quiet for a tool with this much muscle


  • Semi-automatic choke is a bit inconvenient on the underside of the engine

Using the Stihl BT 131 Auger

Getting Started

I maintain a Georgia horse farm in my “free” time. It’s in this horse country that the Stihl auger and I have quite a job: set initial posts for a new barn using an 8-inch bit – the largest the BT 131 accepts. Then, we’ll install new posts for a fence. The auger must work through some pretty hard-packed clay with root and rock obstacles if it’s going to get the job done.

Stihl earth auger fence posts

When I loaded the Stihl auger into my John Deere Gator, I was happy to find out that the tool plus Stihl’s 8″ bit is compact enough to fit completely in the cargo bed. It’s also lighter than I expected.

2-person auger pickup truck bed

When you lay the auger on its side, the gas cap is accessible which makes fueling easy. Stihl emphasizes the BT 131’s large, 24-ounce fuel tank for long run time and efficiency. Having to stop less often to refuel helps me get the job done that much faster.

One thing I really like about startup is that I can set the brake so that the bit doesn’t turn when I fire up the auger. It’s a little thing that lets me set the bit accurately.

36cc engine

Under Load

The hip pad isn’t anything fancy, but it stands out when I’m augering larger and deeper holes. The pressure and heat buildup against your leg/hip are a lot less pleasant on other models. Since I can intentionally put my hip into it, I have better control over the Stihl BT 131.

auger leaning against fence

There’s also significantly less vibration from this auger than from others I’ve used. That doesn’t mean you’ll be able to auger for ten hours unscathed – it’s still hard work. But put this up against anything you might pick up from the equipment rental and you’ll notice a big difference.

Stihl BT 131 Earth Auger Review

Stihl designed the exhaust to discharge away from the operator. This doesn’t just keep you from being engulfed in noxious fumes. It makes the BT 131’s 36.3 cc engine a lot quieter than you’d expect.

Put the Brakes On

The QuickStop Auger Brake is unquestionably the big deal about this tool.  Yes, at first it looks like a bar that could knock you out or take you down at the knees. But the brake is flexible where it connects to the engine and therein is the safety. If the Stihl auger begins to move violently or uncontrollably in a bind-up with a root or rock, the brake comes in contact with your leg, flexes, and stops the bit from turning.

Stihl BT 131 Earth Auger head

Most augers don’t have a feature like this, so you have to get used to how much you can let the auger work before binding. I was a bit concerned that the brake would be in the way. But after using the Stihl auger for a while, I didn’t even notice it. Stihl does a nice job locating it on the tool and giving it a little wiggle room that still allows you to work.


I really like the Stihl’s pistol-grip style throttle in contrast to the traditional motorcycle twist design. It’s much better ergonomically, allowing you to release quicker and control better.

Stihl BT 131 controls

Yay or Nay?

The Stihl BT 131 performs its hole-drilling tasks beautifully. At end of my job list, there was no doubt it has plenty of power to get the job done – even through tree roots and rocks. Georgia clay doesn’t make it bog down in the slightest. As long as you’re using a well-maintained (or new) bit, there’s plenty of power for the full range up to 8″.

Stihl BT 131 Auger

My only gripe is the placement of the semi-automatic choke on the underside of the unit. It’s inconvenient, but far from being a deal-breaker.

Feature Set

  • Hip Pad– The Stihl auger’s Hip Pad cushions your hip/leg from the pressure and heat generated during operation.
  • QuickStop Auger Brake– The auger brake is designed to stop the tool’s rotation when it rotates far enough to hit your leg
  • Vibration Dampening
  • Reduced-Emission Engine Technology– exceeds EPA and/or CARB exhaust emission standards
  • Long-Life Air Filtration System
  • Built in the USA

Stihl BT 131 Earth Auger Price

At $699.95 Stihl BT 131 isn’t pocket change. I wanted to compare it to its arch-nemesis Husqvarna’s counterpart, but it doesn’t look like they offer something comparable in the US market (Australia and South Africa, instead).

You could consider the $243, 43cc Earthquake E43 but you won’t find the brake, vibration-dampening frame, or pad. There are several other value brands that save you money at the cost of features and performance as well.

Echo’s EA-410 Earth Auger seems to be at the high end of the price range at $826. Going this route gets you a 42.7cc engine and 10″ max bit with a less-refined feature set.

The Bottom Line

Stihl puts together a really well-thought-out and refined machine with their BT 131 Earth Auger. It sits at the top of the high-end market with a lower price than Echo and has the features and performance to warrant upgrading from the value brands.

Stihl BT 131 Earth Auger Specifications

  • Displacement: 36.3 cc (2.2 cu. in.)
  • Engine Power: 1.4 kW (1.9 bhp)
  • Fuel Tank Capacity: 710 cc (24 oz.)
  • Drilling Gear Speed: 200 rpm
  • Gear Reduction: 47.5:1
  • Torque (engine): 1.7 Nm (1.25 ft./lb.)
  • Torque (auger): 81 Nm (60 ft./lb.)
  • Powerhead Weight 10.0 kg (22 lb.)
  • Price: $699.95

Related articles