MS 251 WOOD BOSS® - $339.95 DSRP
A powerful and fuel-efficient chainsaw that’s comfortable to use.
The STIHL MS 251 WOOD BOSS® Chainsaw is powerful, fuel-efficient and easy to use. Ergonomically designed to bring you maximum comfort during use, this tool produces 50 percent less emissions (as compared to previous models) for a smaller impact on the environment. The MS 251 WOOD BOSS® packs features like a Master Control Lever™ and easy-to-refill fuel and oil tanks, so you can worry less about st...Read More
Model Features
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Built in the USA
Indicates products that are built in the United States from domestic and foreign parts and components. -
Reduced-Emission Engine Technology - Caring for Nature
The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards. -
Toolless fuel and oil caps with retainers
Simply lift the lever and twist the caps to remove or tighten. There‘s no need to use a tool to tighten or loosen. -
Master Control Lever™
The Master Control Lever™ is an easy to use single lever, operating the choke, starting throttle lock and on-off switch. The operator must pull the throttle trigger before moving the Master Control Lever™ to the choke position.
Standard Features
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Common Features for Chainsaws
View the features common to many STIHL chainsaws.
Important Information
* The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
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.
Click to view the STIHL Limited Warranty Time Periods
STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
We Also Suggest
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HP Ultra 2-Cycle Engine Oil
HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.•2.6 oz. bottle makes 1 gallon mix
•5.2 oz. bottle makes 2 gallon mix
•6.4 oz. bottle makes 2 1/2 gallon mix
•12.8 oz. bottle makes 5 gallon mix
STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in. -
Bar and Chain Oil
STIHL Bar and Chain oil is formulated to adhere to the bar and chain, and to reduce wear. Special agents in the oil formulation help keep sap and pitch from clinging to the bar and chain.Available in quart and gallon bottles, 5 gallon pails and 55 gallon drums, in both summer and winter weights.
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Woodsman Chainsaw Carrying Case
Woodsman carrying case. Unique, removable bar scabbard has built-in tool holders to carry tools to the cutting site. Fits MS 170 to MS 460 M with 20" bar.Replacement latches and scabbard are available.
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Complete Filing Kits
Kits available for the following chain types: STIHL PICCO™ Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch.Chain Pitch File Diameter File Guide
Part NumberSharpening Kit
Part Numberin. mm in. mm Part Number 3/8 PMN 9.32 5/32 4.0 0811 411 8073 1/4
3/8 PM6.35
9.325/32 4.0 0811 411 8091 0.325 8.25 3/16 4.8 0811 412 8088 3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329 0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330
For Your Safety
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Woodcutter Chaps
Apron Chaps from STIHL are made from rugged, 400-denier nylon and feature the same UL® classified protection as our other chaps. Just snap them over your pants and you’re ready to go. Sewn into the legs of the chaps are six layers of Avertic® Pro by Engtex®, a cut-retardant material designed to clog the sprocket and stop the saw chain on a gasoline-powered chainsaw in case of accidental contact with the rotating saw chain. The open back design of these chaps makes them a great choice for hot working conditions. -
Woodcutter Helmet System
The lightweight STIHL Woodcutter Helmet System is an excellent choice for budget-conscious non-professional users with chainsaws and pole pruners. Designed for comfort, the vented shell provides cooling air during use, and the 6-point mount suspension provides comfortable support. The STIHL Woodcutter Helmet System is Class G certified and includes NRR 22 hearing protection. -
STIHL Pro Mark™ Dynamic Protective Gloves
Durable and hardworking, STIHL Pro Mark™ Dynamic Gloves deliver professional-grade hand protection. The palm and inner fingers are made of full grain tanned leather, so you can work with comfort without sacrificing a firm hold. Featuring multiple layers of cut-retardant materials – Avertic® Pro and Dyneema fabrics by Engtex® – these gloves will help deliver protection without compromising the dexterity you need while operating a chainsaw. Accented with an orange rip-stop nylon backing, these dynamic gloves offer style and protection. Water repellant, breathable and featuring a Velcro wrist closure, STIHL Pro Mark™ Dynamic Gloves are as ready for the woods as you. -
STIHL® HellRaiser™ Glasses
The newest member of the STIHL protective eyewear – the STIHL® HellRaiser™. It offers 99% UV protection and style with enough attitude to protect your inner rebel. Featuring an extreme lightweight design and flex-point temples for ultimate comfort and stability.
MS 251 WOOD BOSS® is rated out of 5 by 263.
Rated 5 out of 5 by Anonymous from Another Quality Stihl Product I work for a licensed Stihl dealer in Ottawa lake Michigan. I see the high quality and great value of many Stihl products on a daily basis. Previously I worked for a landscape company experiencing many tools in the field and now in the shop. Picked up this saw for work around home and small side jobs. have put 4-5 tanks of fuel through the saw. Running Moto-Mix, Wood cutter bar oil, 18" bar with a full chisel chain this saw is a running sun of a gun. been very impressed with the weight to power ratio of the saw thus far. Keep a sharp full chisel chain on the saw and it will cut through most small timber in the Ohio/Michigan area with ease. only complaint is the saw has a single bar nut so keep a scwrench handy and check that the bar nut is tight regularly. Haven't had any issues thus far just an precaution I deemed necessary since purchase.
Date published: 2017-09-21
Rated 3 out of 5 by Bowhunter1955 from Disappointed Very disappointed...The starter pull cord broke twice during the first week.
Date published: 2017-09-20
Rated 4 out of 5 by pjquinn66 from Best chainsaw I have ever owned. Great product! Well built. Plenty of power for a home owner. Used to clear some trees and cut firewood.Love the easy access to adjust tension on the chain.Cover, chain, and bar are easy to remove and replace. Makes clean up a snap.
Date published: 2017-09-18
Rated 4 out of 5 by zzzip153 from Back up saw to my Husky Bought this saw as a back up for my 25 year old Husky. Got it just before hurricane Irma hit. Has been going since. Hard to find replacement chains this week with all the power outages and downed trees. Been helping the elderly neighbors, using both saws. Hope it holds up like my Husky has and I'll be happy.
Date published: 2017-09-15
Rated 4 out of 5 by ChrisE from Ms251 woodboss is a good saw, but I have noticed... I bought this saw (ms251 withought easy start or easy chain tensioner) over a month ago. Cut down a dying/dead 10" apple tree days after purchasing. The job was a breeze (aside from the heat in NC), and the chain performed great. I personally have not had issues with starting the chainsaw. I believe many people who are experiencing these issues (admitted by some) are Not following the appropriate steps. If cold, move choke lever to cold choke. Pull the starter rope until it starts to fire, making sure you don't exceed 3-4 pulls as to not flood the engine. Next, move lever to the "starting choke" position, and pull starter rope to finish the startup. If warm, or if you've started it already that day, begin starting the saw in the "starting choke" position. Simple as that. My only issue with the saw, after cutting down a handful of trees, is that the chain is not being oiled sufficiently. Oil is coming out (as I removed the bar/chain and started the saw briefly to observe this), but not enough comes out to properly lubricate the chain. I have been manually lubricating the chain before, and sometimes, during a job. This seems to be a recurring issue amongst owners of this saw. It's important to have the chain lubricated so that the chain, bar, and clutch down overheat, and so the chain doesn't dull out prematurely. While this is unfortunate, and somewhat annoying, I still enjoy the saw, and am impressed with its performance.
Date published: 2017-09-11
Rated 5 out of 5 by matt82 from very good choice i have cut up about 12 8 foot logs of various thickness and not disappointed at all.
Date published: 2017-09-10
Rated 5 out of 5 by bear73 from Best bang for your buck I received this beauty from my family on my 63rd Birthday, I can tell you - I am very pleased indeed! I have felled quite a few Ash trees that had emerald bore infestations on my property. These aren't sissy trees, they are good size and the Wood Boss held up to it's name.Easy to start - easy to operate as long as you are conscious of your surroundings and stay alert and safe.Good weight distribution and pretty quite too.
Date published: 2017-09-09
Rated 5 out of 5 by PAB200 from Great balance of weight and power The MS 251 Wood Boss is a great homeowner/woodcutter saw with an ideal balance of weight, bar length and power for tasks around the home/ranch and for firewood cutting. Starts easily and runs great - easy to keep in tune. I ran Stihl chainsaws years ago professionally and I'm very pleased with this 'small' saw - it has the same quality design and construction as the big pro saws I used to use.
Date published: 2017-09-05
