MS 251 WOOD BOSS® - $329.95 DSRP

Distributor Suggested Retail Price
18 in. Bar

DSRP: $329.95


Reserve with STIHL Express for In-Store Pick Up

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
Print Spec Sheets
MS 251 WOOD BOSS® Specifications
DISPLACEMENT 45.6 cc (2.78 cu. in.)
ENGINE POWER 2.2 kW (3.0 bhp)
POWERHEAD WEIGHT 4.9 kg (10.8 lbs.)
FUEL CAPACITY 390 cc (13.2 oz.)
CHAIN OIL CAPACITY 198 cc (6.7 oz.)
GUIDE BAR LENGTHS (Recommended ranges) 40 to 45 cm (16" to 18")
STIHL recommends #3634 (26 RM3 68) OILOMATIC® saw chain and 18" 3005 008 4717 STIHL ROLLOMATIC® E guide bar combination. The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.
Model Features
  • Zoom
    Built in the USA
    Indicates products that are built in the United States from domestic and foreign parts and components.

    More Information

  • Zoom
    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.

    More Information

  • Zoom
    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.
  • Zoom
    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
  • Zoom
    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: Cancer and Reproductive Harm -
ADVERTENCIA: Cáncer y Daño Reproductivo -
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
We Also Suggest
  • HP Ultra 2-Cycle Engine Oil Zoom
    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 Zoom
    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.

  • Woodsman Chainsaw Carrying Case Zoom
    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.

  • Complete Filing Kits Zoom
    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 Number
    Sharpening Kit
    Part Number
    in. mm in. mm Part Number
    3/8 PMN 9.32 5/32 4.0 0811 411 8073

    5605 750 4327

    5605 007 1026

    3/8 PM
    5/32 4.0 0811 411 8091

    5605 750 4327

    5605 007 1027

    0.325 8.25 3/16 4.8 0811 412 8088

    5605 750 4328

    5605 007 1028

    3/8 9.32 13/64 5.2 0814 243 3384 5605 750 4329

    5605 007 1029

    0.404 10.26 7/32 5.5 0811 412 8108 5605 750 4330

    5605 007 1030

For Your Safety
  • Woodcutter Chaps - 6 Layer Zoom
    Woodcutter Chaps - 6 Layer
    Woodcutter Chaps - 6 Layer 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 Zoom
    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 Zoom
    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 Zoom
    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.

Are You Ready for a STIHL?

MS 251 WOOD BOSS® is rated 4.3 out of 5 by 349.
Rated 5 out of 5 by from Nice chain saw. I needed to replace an older other brand saw.I almost didn't buy a Stihl because they are more money but since I have heard good things and read good reviews and wasn't happy with my other brand saw I decided to go for it. I have had it for a year and don't use it a lot but have cut up several trees now. It works great.Easy controls, cuts great,runs well,easy to start. Some people expressed concern that there is only one nut to tighten/lhold the chain bar;that is not an issue,I have had no problems with it and it's easy to adjust with tool that comes with the saw.I'm glad I bought this one.
Date published: 2016-06-18
Rated 5 out of 5 by from Exactly What I Was Looking For This saw was a little difficult to start at first, I'm sure it is breaking in. I'm very impressed with the power. It rips through everything I've used it for. I don't cut massive trees with it, but I use it for medium duty. Meets or exceeds my expectations.
Date published: 2016-05-25
Rated 5 out of 5 by from very reliable medium duty saw I have a lot of large trees on my land and get to cut up 6 to 10 inch limbs quite often. I went to an arborist supply to find a replacement for my old (antique)pre-government chainsaw. This was the closest that I could find. For large stuff I own a Stihl 46 magnum but it is to heavy for limbing and small wood. Although the MS251 is bulkier and slightly heavier (thanks to government interference) the power is comparable. My only complaint is that there is no blade and sprocket combination that would allow a 3/8 chain. That would allow it to compete in aggressiveness (speed of cutting) to the lighter old saw. Bottom line: this is the best and most reliable chain-saw that I have been able to find (regardless of price) tor using in medium wood.
Date published: 2016-05-21
Rated 5 out of 5 by from Montana Wood Cutting Easy to use saw, starts with no issues at all. Saw is light enough to use for yard work, but still powerful enough to take into the backcountry and cut firewood. STIHL has always made a good product and this one is worth the money.
Date published: 2016-05-16
Rated 5 out of 5 by from Unbelievable I have used lots of chains saws but not for serious work. I just bought a mountain home and needed to cut a lot of hardwood 12"-24 oaks and hickories. It is a tough pull in choke, but three pulls it starts every time. The first time I touched the blade to wood I knew it was a different animal. Small timber melts big logs cut steady. 30 trees into the project, a lifetime of firewood and it is still the best chain saw I have ever seen. It is painful to suggest weaknesses. I flat out will never buy another chain saw. It has paid for itself six fold. I mentioned the hard pull, the other thing is the oil tank cap should have a better alignment mark to close it. That's all
Date published: 2016-05-05
Rated 5 out of 5 by from This chain saw works GREAT!! This is the 1st Stihl chain saw i've owned or used. It replaced an older chain saw of similar size. The 1st time I used it I was amazed at how fast it cut and the amount of "chips" that quickly covered my boots. I've cut down roughly 8-9 trees in my 1st year. It starts every time it is needed on the 3-4 pull. If the engine "pops", take it off choke and start it. Has plenty of power for the trees I have cut down, up to 18". The easy off gas and bar oil caps work well and don't leak. I only use Stihl gas and drain the tank when I'm done using it.
Date published: 2016-04-30
Rated 5 out of 5 by from Awesome saw Im a climber of 18 yrs.i have run many brands in the past and have owned several stihl saws.stihl is the only saw i invest money the german engineering.i am a loyal stihl customer.thanks for building such a dependable saw.always impressed!!!
Date published: 2016-04-29
Rated 4 out of 5 by from Great mid-size saw Over all this saw has worked amazing. After about 30 starts the pull cord broke, but it was a quick easy fix with some 550 cord.
Date published: 2016-04-22
Rated 5 out of 5 by from 80 years old an his new MS251 Top notch--Easy to use AND maintain (I just wish that I bought when I was younger rather than wearing out 3 brand x (Poulans) It is well worth the price difference.MTL
Date published: 2016-04-18
Rated 1 out of 5 by from This product is garbage The chainsaw has not worked right ever since I bought it. I can't even get it to start and it has leaked oil and fuel since the first day. It is a horrible product and I will never buy another Stihl product again.
Date published: 2016-04-14
Rated 5 out of 5 by from Outstanding saw Chainsaw is easy to start,simple to operate and has plenty of power for all my needs.I love the easy start system
Date published: 2016-04-05
Rated 5 out of 5 by from This product takes care of all my needs. This product is great for me. I use it as needed around the farm and strongly recommend it to others. It is sturdy and holds up to every job I use it for, thanks STIHL.
Date published: 2016-03-31
Rated 2 out of 5 by from Not what I expected Starts quick and runs all the time. I wish it cut like I expected. I've had issues with the chain oil. I get smoke when I cut so i know the oil system has an issue. Love my blower but wish I had picked a different saw - or I wish I had a version of my saw that works perfect. Bummed :-(
Date published: 2016-03-24
Rated 5 out of 5 by from Nimble but powerful for the woodcutter I got this for a christmas present last year as we were going to a fireplace insert to save on home heating energy bills. I used this saw all summer, fall and winter and it has been excellent. Its light and nimble but has plenty of power and starts up like a dream. I also have a 362cm for large stuff and it is also an excellent saw but I find myself using this woodboss much more often. I highly recommend it. I would say I actively cut firewood every other weekend.
Date published: 2016-03-11
Rated 5 out of 5 by from Perfect Homeowner Saw This is the first new saw I have purchased and have always had hand me downs. Saw has plenty of power and is balanced enough for bucking or limbing. From day one I used the RS .325 .63 Yellow chain and the saw now cuts like a Stihl branded saw. Wear your chaps and wear your gloves and helmet and respect your saw, This isn't a weed eater your playing with. 1# key to safety is to not put your legs, feet or head in the follow through path or kick back path of the saw. Seems like common sense but you know the saying. When you walk with the saw, use the brake, that's what its there for. Tripping with a running saw is easy to do and will make you have a bad day.The green chain takes 2-3 times longer for the same cut as the yellow RS chain. The Stihl 2 in 1 file is a must when running Chisel chain. As soon as the saw stops throwing chips and is making saw dust then you need to touch up the teeth with the file. Use the green chain for cutting up that dirty dead wood trees that is full of ant holes. You would be surprised how much dirt ants bring into a tree. I'm not a big fan of the single bar nut but it does make it easier to get the side case off and clean up the saw. There is a metal collar that the nut cranks down on so its not just cranking down on plastic. The chain will slack when its hot so don't immediately rush to tighten it. I highly recommend the Oregon 100961X Power Mate Sprocket System over the paddle wheel design. The chain seems to pull better through wood and less wear and tear on the saw. I use the .325 7 tooth sprocket. Not sure why Stihl doesn't make a rim sprocket for this size saw. Cold starts are easy, 1 or 2 pulls until the saw burps then move the choke up one click and it starts every time. Warm starts it will normally start with the choke on run with 1 or 2 pulls. I only run the Moto Mix in my Stihl blowers so I normally have a gallon on hand for the saw. You can run premix but make sure it is ethanol free gas. There is a lot of plastic on the saw so only time will tell if it holds up. There is a trade off of weight vs. durability. Over all I'm pretty happy with the saw.
Date published: 2016-03-01
Rated 5 out of 5 by from Great chainsaw backed but awesome service. I ended up deciding on the 251 Wood Boss and am so glad I did. I looked into other brands of chainsaws as well. The support at the local Stihl dealership was really helpful to confirm my research online. I also feel like I have a place to go if I ever need anything or actually wear it out (doubtful). I already used it to cut small rounds off a downed tree for firewood and cut up some large limbs that fell on the property.One thing that I love about this chainsaw is it's incredibly easy to start. I wore out my last chainsaw (another brand) and towards the end I really had to pull to get it to start. With the Wood Boss, it takes about 5 pounds of effort with only two pulls from cold. I also love that it doesn't leak fuel or chain lube. All my other chainsaws did. It's also the little things that matter like the way the caps screw down and how the bar adjusts. All those things really add up when you use it. I'm so glad I purchased it and literally love firing it up to go cut wood!
Date published: 2016-02-17
Rated 4 out of 5 by from This is a great Homeowner chainsaw fo the price. I bought this saw about 2 years ago from a local dealer in NH. It's a great saw for cutting firewood and clearing brush and small trees. I ran this saw for about 2 hours nonstop one day while clearing brush and small trees. never over heated or bogged down. it's a great saw for the price and it's more than a homeowner saw.
Date published: 2016-02-11
Rated 5 out of 5 by from Everything I wanted... I own 2.5 acres in East TN surrounded by trees on 3 sides and have a lot of trees to maintain. During last winter's ice storm ~12 pine trees either snapped in half or came down completely. I bought an MS251 in November and its made short work of that mess over the past 1/2 dozen weekends. It starts easy every time, even when its only 35 degrees outside. Having owned several other chainsaws over the years the STIHL is worth the extra coin. I'd have given it 5 stars across the board but cannot vouch for Quality as I've only been using it for ~3 months. So far so good though and its easy to adjust the chain tension.
Date published: 2016-02-03
Rated 5 out of 5 by from Excellent Saw The Stihl 251 Wood Boss is the first chainsaw I have purchased. I was set on a Stihl after using a Stihl 290 Farm Boss that my father in law has owned for years. You get what you pay for and the 251 delivers. I have only run two tanks through it during the break in period. So while only using half throttle, it has plenty of power. The vibration reducing system is great. 4 hours of cutting and no tingly hands. It also seems to sip fuel. Very happy with my purchase.
Date published: 2016-01-31
Rated 4 out of 5 by from Good saw. This is my second Stihl saw. The first, an 021, was a great saw. I've owned this current Wood Boss for 9 months and it is as or more powerful than the 021, but I believe it's a little bit cheaper built. The biggest complaint I have about the Wood Boss is the single chain-tightening bolt. I'm having a heck of a time keeping the chain tight and I'm afraid to really crank down on the tightening bolt head as it has a plastic grommet looking thing around it. Other than that, the saw is powerful and cuts like a demon. It cranks right up, usually on the second pull when cold, first time when warmed up, and I really like the easy-fill oil and gas tank covers.
Date published: 2015-12-12
Rated 5 out of 5 by from MS 251 WOOD BOSS I was looking to buy a saw so I could cut some fire wood and smoking wood. I searched and searched red reviews and all that jazz. I went to a local ace hardware that was stihl dealer and the salesman who also happened to be there mechanic took the time to go over this particular saw with me. After I decided to buy it he took me in the back to his shop and filled it up with gas an bar and chain oil. He started it and tuned it and got it running perfect (it didn't take much). I took it out today the same day I bought it and cut a truck bed full of oak and this saw did phenominal. Never had one issue with it. I ran it hard and never had a problem restarting it. I am very pleased with this purchase and glad I went with a stihl
Date published: 2015-12-10
Rated 5 out of 5 by from Shil 251/Wood Boss Needed a saw, could have done the less expensive, or gone cheaper (route). But I got a Sthil. I needed to trim the 3 large oak trees in my yard. I got the Wood Boss! Well the chain saw DEFINITELY lives up to the name. I used all of the recommended products from the dealer in Deer Park, TX. I purchased the bar oil, fuel oil, lanyard, extra chain, sharpening stone (dremel) and carrying case. Great service, great product. Reliability is the best, I had a bit of trouble starting out but the dealer advised me over the phone and I was underway in no time. The built in safety feature on the Stop-bar, was much appreciated while I was 30 feet at the top of a ladder (while tied off). It prevented me from hurting myself. Great reliability, great fuel economy, and a well designed safety feature.
Date published: 2015-12-07
Rated 5 out of 5 by from Great saw for home owners A excellent saw lots of power for cutting fire wood extremely pleased with performance and durability of the MS 251 my next saw will be a stihl professional saw for the larger trees.
Date published: 2015-12-04
Rated 5 out of 5 by from This saw worked me We just had an ice storm come through, needed a new saw, so I decided on this one. Used this one first day, and it was great. Plenty of power, easy to operate easy to handle. Very good product.
Date published: 2015-12-02
Rated 5 out of 5 by from Meets my needs I own a Pecan tree orchard and it's a normal event for limbs to fall or for trees to be trimmed. I've had the pleasure of using this saw for an entire year and it has met my expectations, fully. Limbs can be anywhere from 4 inches to 25 inches though, this saw is never too heavy to handle. Only on one occasion did I have an issue with getting it started however, I blame myself for getting into a hurry. Aside from that one episode, it has been flawless. Some would disagree to this but, I run STIHL's Moto Mix fuel only. I do so because there can be periods where the saw could sit for more than 2 months - guess I'm paranoid. Overall, this is probably the best saw for light to medium work.
Date published: 2015-11-30
Rated 5 out of 5 by from This product is a work horse I wanted a saw for some tree cutting around the house 50"pine trees, After looking at different saws i picked the stihl ms 251 wood boss. This saw is a beast. Starting up cold 3 or 4 pulls starting up warm 1 pull, The ms 251 never missed a beat took trees down like they were made of butter. light weight in size and easy to control very little vibration . very very happy with the stihl ms 251 wood boss
Date published: 2015-11-15
Rated 5 out of 5 by from Great saw...Stihl continues to make great products I've owned a Stihl 034 for over 20 years, and it has never let me down. I still run it today. I bought this saw, looking for something lighter for trimming branches and small trees. I find myself grabbing this saw for almost everything now. For it's small size and light weight, this saw is a beast. Easily cuts through large logs and cord wood, but is still light enough for small pruning jobs. Seems to be a good quality saw that I expect to own for another 20 years.
Date published: 2015-10-28
Rated 5 out of 5 by from Outstanding Product I purchased this product after a wind storm occurred. I have owned several chain saws that never seemed to get the job done. They didn't last long and failed to start and didn't seem to cut like they should.This saw cuts like a dream. The local Ace hardware store convinced me bite the bullet and purchase this saw. We cut the downed trees with ease. Two days of constant cutting and it never failed.
Date published: 2015-10-08
Rated 5 out of 5 by from I love this Saw! I bought this saw after a tornado struck our campground. It is the first chainsaw i have ever purchased, and I am so glad I did. Always starts easy, easy to adjust the bar and very fuel efficient. I have put in about four days of constant use at the campground and only went thru 1 gallon of gas. 8 hrs a day almost all day long it has had to be sharpened a few times, but does all the ground work effortlessly. I highly recommend this saw for a homeowner as I have punished this saw, it even fell off a ten foot high roof and never missed a beat.
Date published: 2015-09-29
Rated 1 out of 5 by from Disaapointing... Returned for Refund Cheap Plastic trigger Handle was so thin and cheaply made that it moved apart far enough to pinch the skin on your hand . The plastic is slick on the handle as well , so it doesn't grip well. I cranked this saw a few times and it picnhed the skin on my hand enough that I didn't even start it , I took it back . Everything about this saw was cheaper made than the 250 model . there is only one bar bolt mounted in plastic.. The choke lever felt so flimsy.I have gone out and looked at other brands to compare quality since I took this one back, so far I have not seen any saws in the price range of the 251 that felt so cheaply made as the 251...and none that piched my skine when I held it.. I was very disappointed in the stihl 251 saw, wish I had looked a little closer before I wasted my time with buying it.. I guess I gave the stihl name a little toooo much respect..
Date published: 2015-09-10
  • y_2018, m_7, d_18, h_23
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_9, bvpage2n
  • co_hasreviews, tv_0, tr_349
  • loc_en_US, sid_ms251, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_stihl