The largest diameter trimmer line recommended is 0.105".
Free Gift Card Details
$100 Order
$250 Order
$500 Order
$1000 Order
- The promotion will be automatically applied on the Shopping Cart page.
- To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
- Free gift cards will be issued in the form of e-gift cards only, not physical gift cards.
- E-gift cards will be sent to the email address used in your billing address when your order ships or is picked up.
- Free e-gift cards expire 11/01/26.
- Promo code not valid on prior purchases or on Honda and STIHL products and cannot be combined with other promotional offers.
- Valid online and in participating retail stores.
- Limited-time offer. Subject to change without notice.
Stihl FS Series Gas-Powered Straight Shaft String Trimmer, 16 1/2in. Cutting Width, 36.3cc, 1.9 HP, Model# FS 131 R

This is a carousel with one large zoomable image and a track of thumbnails on the left. Select any of the thumbnail buttons to change the zoomable image on the right. If a thumbnail is a video or 360 degree image thumbnail, or the last thumbnail in the list, the button will open the product media modal.

Click or Tap image to Zoom
Shipping:
Not availableIn Store Only:
Sold only in stores - Out of stock at Fredericksburg VA
- Simplified starting with semi-automatic choke lever and one-touch stop
- Low emission STIHL engine delivers dependable power and fuel efficiency with a larger fuel tank that delivers 30% longer run times when compared to previous models
- AutoCut® tap and go cutting head automatically feeds out new line with just a tap on the ground
- Shoulder strap carrying system with support strap helps evenly distribute equipment weight for increased operating comfort and maneuverability
- Adjustable front handle for maximum operating comfort
See full description
Description
Key Specs
Reviews
Q & A
Accessories
Warranty
Compare
Product Summary
This item may be purchased at select Northern Tool stores. Not available for online order at NorthernTool.com.
What's Included
- (1) String trimmer
Features + Benefits
- Simplified starting with semi-automatic choke lever and one-touch stop
- Low emission STIHL engine delivers dependable power and fuel efficiency with a larger fuel tank that delivers 30% longer run times when compared to previous models
- AutoCut® tap and go cutting head automatically feeds out new line with just a tap on the ground
- Shoulder strap carrying system with support strap helps evenly distribute equipment weight for increased operating comfort and maneuverability
- Adjustable front handle for maximum operating comfort
- Fully-lined drive shaft provides smooth operation and less vibration
- Lightweight, high-tech polymer housing withstands hard impacts and is corrosion resistant
- Protected choke lever/knob helps prevent accidental damage
- Easy access multi-function control handle has start/run/stop controls located right on the handle for comfort and easy task completion without having to remove hands from the handle
- Throttle Trigger interlock system helps prevent accidental activation
- Easy access air filter cover for fast and easy filter cleaning or replacement
- Protected/enclosed control cables eliminate dangling and loose wires
- Heavy-duty steel-on-steel centrifugal clutch is designed to reduce slippage
- Easy-to-change spark plug is protected from the elements
- Spark arrestor muffler features large baffles to reduce noise level and a screen helps reduce the emission of sparks
- Upright, translucent fuel tank for quick, one-glance fuel level checks
- Purge pump primer delivers fuel directly to the carburetor to help promote quicker starts
- Reduced emission engine technology produces zero or low exhaust emissions that are cleaner than EPA and/or CARB exhaust emission standards
- Rubberized loop handle design provides a comfortable grip and exceptional control for easier trimming between bushes, shrubs and other areas where space is limited
Key Specs
| Attribute | Specification |
|---|---|
item# | 63943 |
Brand | Stihl |
Manufacturer's Warranty | 2 year limited warranty |
Ship Weight | 18.0 LB |
Product Type | Trimmers |
Primary Power Source | Gas |
Max. Cutting Width | 16.5 in |
Cutting Width (in.) | 16 1/2 |
Displacement (cc) | 36.3 |
| Attribute | Specification |
|---|---|
Fuel Tank Capacity (qt.) | 0.75 |
Engine Displacement | 36.3 cc |
Fuel Tank Capacity | 0.75 qt |
Cordless | Yes |
Horsepower | 1.9 HP |
Line Diameter | 0.095 in |
Shaft Type | Straight |
Tool Weight | 12.1 |
Reviews
Questions & Answers
Questions
-
Anonymous· a year ago
What size string line
1 answer-
ProductExpert11· a year ago
Helpful?
-
-
· 2 years ago
Chainsaw attachment
1 answer-
ProductExpert23· 2 years ago
The Stihl FS Series gas-powered straight shaft string trimmer (Model FS 131 R) itself does not have a chainsaw attachment.
Helpful?
-
-
· 5 years ago
i looking for brush cutter .Does this unit use brush blade for cutting heavy brush . when i say blade, i mean a round toothed blade. Should i be looking at a different unit? please provide specifics asi thought this unit was solid shaft brush cutter.
1 answer-
ProductExpert38· 5 years ago
This uses a string trimmer head, a blade attachment is unavailable for this model.
Please view powerhead item 63934, and blade attachment item 63937 for the combination you seek.Helpful?
-
Accessories We Recommend
This is a carousel with auto-rotating slides. Activate any of the buttons to disable rotation. Use Next and Previous buttons to navigate, or jump to a slide with the slide dots.
Warranty
Manufacturer's Warranty
2 year limited warranty
Extend Your Warranty Coverage with a Northern Protection Plan (NPP)
Repair Plan — 1 Year
A Northern Protection Plan is available after adding the product to your shopping cart.
Compare with Most Popular in Trimmers + Brush Cutters
See All Trimmers + Brush Cutters
See All Stihl Trimmers + Brush Cutters
Currently Viewing This Product
$569.99Shipping:
Not availableIn Store Only:
Sold only in stores - Out of stock at Fredericksburg VA
- $6699.99
Shipping:
Factory shippedHeavy/large item. Lift gate service available.
Store Pickup:
Not available - online only
Item # 89259
$219.99Shipping:
Not availableIn Store Only:
Specifications
Trimmers
Brush Cutter
Trimmers
Gas
Gas
Battery
16.5 in
26 in
11 in
16 1/2
26
11
36.3
389
-
0.75
-
-
36.3 cc
389 cc
-
0.75 qt
-
-
Yes
Yes
Yes
1.9 HP
13 HP
-
0.095 in
-
-
Straight
-
Straight
12.1
395
7.6 lbs. w/ AK 10 battery
-
16/6.5 x 8 pneumatic bar lug
-
-
-
Lithium-ion



