BT 121 Earth Auger
A lightweight and powerful earth auger with STIHL Quickstop® brake technology.
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.
| BT 121 Earth Auger Specifications | |
| DISPLACEMENT | 30.8 cc (1.88 cu. in.) |
| ENGINE POWER | 1.3 kW (1.75 bhp) |
| WEIGHT | 9.4 kg (20.7 Ibs.) |
| FUEL TANK CAPACITY | 640 cc (21.6 oz.) |
| DRILLING GEAR SPEED | 190 rpm |
| GEAR REDUCTION | 47.5:1 |
| TORQUE (engine) | 1.7 Nm (1.25 ft./lb.) |
| TORQUE (auger) | 79.0 Nm (58.22 ft./lb.) |
Important Information
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING! Improper use of any power tool may cause serious
or fatal injury. Read, understand and follow carefully the operating
and safety instructions in your instruction manual before using such products.
STIHL products sold through U.S. STIHL dealers are for distribution in the United States only.
Model Features
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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.
You Will Also Need
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HP Ultra 2-Cycle Engine Oil
No matter how you slice it (or trim it or shred it), there’s no better protection for your high performance 2-stroke engine than STIHL HP Ultra. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus “ultra” lubricating qualities that’s superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We’re so confident this oil will protect your engine, we’ll double your STIHL limited warranty* when you use it. It’s that good.
*Double your warranty when you include 6 bottles of STIHL HP Ultra Oil or 6 cans of STIHL MotoMix® Premixed Fuel with your STIHL product purchase. Double limited warranty protection applies to STIHL gasoline-powered products purchased and registered for personal non-income producing, family and household purposes only. Other restrictions apply. See dealer for details.
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No-Spill® Fuel Containers
No-Spill® fuel containers advance convenience and quality in gasoline-can design by reducing emissions of hydrocarbons from evaporation, permeation and spillage. This helps protect the environment as well as saves you on fuel costs due to waste. Each container is molded from fluorinated, high molecular weight material for low permeation. The thumb-button flow control allows filling even smaller-sized tanks reducing the risk of spilling and is designed to stop the flow automatically when the tank becomes full to prevent overflowing. Built on a wide and stable base for less likelihood of upsets and equipped with child-resistant closures, all No-Spill® containers comply with both EPA and CARB requirements. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs.
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Auger Bit Adapter 1” Square Connection
If you have a variety of auger bits, the Auger Bit Adapter fits auger bits with a 1” square drive and allows other bits to be run on the STIHL BT 121 Earth Auger.
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For Your Safety
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Pro Mark™ Apron Chaps - 9 layer
For heavyweight protection that won’t weigh you down, choose Pro Mark™ Apron Chaps from STIHL. They’re rugged, yet comfortable to wear and easily fit over your work clothes. Sewn into the legs of the chaps are nine layers of Engtex®, a cut-retardant material designed to reduce the risk or severity of injury to the body parts covered by the pads in the event of contact with the rotating saw chain of a gasoline-powered chain saw. The open-back design of these chaps makes them a great choice for hot working conditions. These Pro Mark™ apron chaps provide three additional layers of Engtex® than our standard apron chaps. STIHL chain saw protective apparel is also wash and wear, unlike some other brands that require dry cleaning or light surface cleaning.
The STIHL Pro Mark™ designation identifies products for professional users.
Available color: High Visibility Orange
Available lengths: 32", 36", 40"
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Proscaper Series Gloves
When you require more protection than traditional landscaping gloves, turn to Proscaper Series Gloves from STIHL. These gloves feature premium boarskin for terrific softness and padded palms for abrasion resistance. A woven elastic back flexes to allow total freedom of movement. An adjustable, wrist strap closure provides personalized comfort and a secure fit.
Available materials: Boarskin
Available sizes: M, L, XL
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STIHL® Forestry Helmet System
The woods can hold many dangers. Stay one step ahead with the Forestry Helmet System from STIHL. The protection starts with a hard shell of ABS thermoplastic. It gets even better with a six-point, ratchet-style suspension system that absorbs shock and keeps the helmet stable while you work.
The system also features a Cool Guard sweatband to keep perspiration out of your eyes, as well as a built-in rain gutter to direct rain away from your face during inclement weather. Adjustable hearing protectors comfortably reduce noise while an epoxy-coated steel full-face screen helps protect from flying debris.
Hard hat meets ANSI Z89.1-2003 Type 1 Class G & C. Hearing protectors meet ANSI S3.19-1974 and have a Noise Reduction Rating (NRR) of 24 dB(A).
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