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Standard Features
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The BT 121 earth auger from STIHL® is packed with power; it's what professionals use on tough terrain or remote jobs where power and light weight are a priority. This lightweight, one-man auger features our exclusive STIHL Quickstop® brake, which is a great feature if you contact a rock, root or other immovable object. When the bit hits a rock, the BT 121's STIHL Quickstop brake activates and stops the bit from rotating, while the powerhead on most other augers continues to turn. The quick action of the STIHL brake is something your arms will appreciate when working in rocky or heavily wooded sites. The BT 121 is also equipped with transmission lock-out for easy starts and easy "back out" if the bit gets stuck. Double gear reduction gives this auger great drilling performance. With the brake, an advanced vibration dampening system and large hip pad, you get power, performance and comfort.

Auger bits sold separately.


Model Year
BT 121 Earth Auger
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20.7 lbs. (9.4 kg)


1.75 bhp (1.3 kW)
1.9 ci (30.8 cc)
Engine: 1.25 ft. lbs. (1.7 Nm)
Auger: 58.22 ft. lbs. (79 Nm)
Fuel Tank Capacity
21.6 oz. (640 cc)


190 rpm drilling gear


47.5:1 gear reduction

Standard Features

Long-Life Air Filtration System
 The long-life air filtration system helps reduce the need for frequent filter cleanings.  
STIHL Quickstop® Auger Brake
 This braking system is designed to stop the bit from digging when the auger hits a hard underground impediment.  
 In addition, the STIHL Quickstop drill brake acts to stop backwards rotation.  
 A jammed drill bit can simply be unscrewed from the borehole.  
Hip Pad
 The hip pad is positioned close to the body or leg of the operator during use for more comfortable operation.  
Vibration-Dampening System
 This advanced vibration-dampening frame increases user comfort and helps reduce operator fatigue, especially when used over long periods of time.  
STIHL ElastoStart™
 The ElastoStart starter handle is an exclusive feature of STIHL.  
 It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord.  
 The ElastoStart starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking.  
 The forces which occur at the grip after the first compression stroke are smoothed out.  

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*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.