Chain For Stihl MS170 Chainsaw: Best Picks & Tips (Pro Sharpening)

The future of efficient and safe wood processing hinges on understanding the nuances of the tools we use. Chainsaws, in particular, are indispensable for everything from felling trees to preparing firewood. As technology advances, so too must our knowledge of how to optimize these machines. This guide focuses on selecting the best chain for your Stihl MS170 chainsaw and mastering the art of professional sharpening. It’s not just about cutting wood; it’s about cutting smarter, safer, and more sustainably.

Understanding Chain Components

Before diving into specific recommendations, let’s break down the anatomy of a chainsaw chain. Knowing these components will empower you to make informed decisions:

Cutters: These are the teeth that do the actual cutting. They come in various shapes, each suited for different tasks.
Tie Straps: These connect the cutters and drive links, providing the chain’s structural integrity.
Drive Links: These fit into the guide bar groove and are propelled by the chainsaw’s sprocket. The number of drive links is critical for proper chain fit.
Depth Gauges (Rakers): These control the amount of wood each cutter takes with each pass. Proper depth gauge setting is essential for smooth cutting and preventing kickback.

Types of Chains for the MS170

The Stihl MS170 is a versatile chainsaw, but it performs best with specific chain types. Here’s a rundown of the most common options:

Low-Profile Chains (Picco Micro): These chains are designed for smaller chainsaws like the MS170. They feature a smaller cutter and shallower depth gauges, reducing the risk of kickback. They’re ideal for homeowners and occasional users.
Semi-Chisel Chains: These chains have a rounded cutter shape, making them more forgiving when cutting dirty or abrasive wood. They hold their edge longer than full-chisel chains but cut slower.
Full-Chisel Chains: These chains have a square-cornered cutter, providing aggressive cutting performance. However, they dull quickly when exposed to dirt or debris. They’re best suited for clean wood and experienced users.
Ripping Chains: These chains are specifically designed for cutting wood along the grain, such as milling lumber. They have a unique cutter geometry that produces a smooth, even cut.

Data Point: A study by Oregon State University found that low-profile chains reduce kickback energy by up to 30% compared to full-chisel chains. This is a significant safety advantage for novice users.

Selecting the Right Chain: Key Considerations

Choosing the right chain involves considering several factors. I’ve developed a simple checklist to guide you:

Wood Type: Are you cutting softwoods (pine, fir) or hardwoods (oak, maple)? Hardwoods require more aggressive chains.
Cutting Conditions: Is the wood clean or dirty? Dirty wood dulls chains quickly, making semi-chisel chains a better choice.
User Experience: Are you a beginner or an experienced chainsaw operator? Beginners should opt for low-profile chains for safety.
Desired Cutting Speed: Do you prioritize speed or longevity? Full-chisel chains are faster but require more frequent sharpening.
Chain Pitch and Gauge: Ensure the chain pitch (distance between rivets) and gauge (thickness of the drive links) match your chainsaw and guide bar specifications.

Technical Requirement: The Stihl MS170 typically uses a 3/8″ low profile pitch chain with a .050″ gauge. Always verify this before purchasing a chain.

Recommended Chains for the Stihl MS170

Based on my experience and extensive research, here are some of the best chain picks for the Stihl MS170:

Stihl 61PM1 50: This is Stihl’s standard low-profile chain, ideal for general-purpose cutting. It offers a good balance of performance and safety.
- Specifications: 3/8″ Low Profile, .050″ Gauge, 50 Drive Links
Oregon S56: A popular aftermarket option, the Oregon S56 is a low-vibration chain that’s easy to sharpen.
- Specifications: 3/8″ Low Profile, .050″ Gauge, 56 Drive Links
Husqvarna H38: While Husqvarna is a competitor to Stihl, their H38 chain is compatible with the MS170 and offers excellent cutting performance.
- Specifications: 3/8″ Low Profile, .050″ Gauge, 50 Drive Links (check to verify)

Case Study: I once worked on a project clearing storm-damaged trees in a heavily wooded area. We used Stihl MS170 chainsaws with Oregon S56 chains. The combination proved to be reliable and efficient, even when cutting through dirty and knotty wood. The low-vibration design of the Oregon S56 reduced operator fatigue, allowing us to work longer hours.

Chain Installation: Step-by-Step Guide

Installing a new chain is a straightforward process, but it’s essential to follow the correct steps to ensure safety and proper operation.

Safety First: Always wear gloves when handling chainsaw chains. The cutters are sharp and can easily cause cuts.
Loosen the Bar Nuts: Use the wrench that came with your chainsaw to loosen the bar nuts on the side cover. Don’t remove them completely.
Adjust the Chain Tension: Turn the chain tensioning screw (usually located on the side of the chainsaw) counterclockwise to loosen the chain.
Remove the Old Chain: Carefully remove the old chain from the guide bar and sprocket.
Install the New Chain: Place the new chain around the guide bar, ensuring the cutters are facing in the correct direction (they should point forward on the top of the bar).
Engage the Drive Links: Make sure the drive links are properly engaged in the guide bar groove.
Position the Guide Bar: Place the guide bar back onto the chainsaw, aligning the bar studs with the holes in the guide bar.
Tighten the Chain: Turn the chain tensioning screw clockwise to tighten the chain. The chain should be snug but still able to be pulled around the guide bar by hand.
Tighten the Bar Nuts: Tighten the bar nuts securely, but not excessively.
Check the Tension: After tightening the bar nuts, recheck the chain tension. It should still be snug but not too tight.

Practical Tip: A properly tensioned chain should have about 1/8″ of slack. You should be able to pull the chain away from the guide bar slightly.

Chain Maintenance: Extending Chain Life

Proper chain maintenance is crucial for extending the life of your chain and ensuring optimal cutting performance. Here are some essential maintenance tips:

Sharpen Regularly: Sharpen your chain after every few hours of use, or whenever you notice a decrease in cutting performance.
Clean the Chain: Remove sawdust and debris from the chain after each use.
Lubricate the Chain: Use a high-quality bar and chain oil to keep the chain lubricated. Proper lubrication reduces friction and wear.
Check Chain Tension: Regularly check the chain tension and adjust as needed.
Store Properly: Store your chainsaw with the chain covered to protect it from dirt and rust.

Technical Detail: The recommended bar and chain oil viscosity for the Stihl MS170 is SAE 30.

Pro Sharpening Techniques: Achieving Razor-Sharp Results

Sharpening a chainsaw chain is an art form. A dull chain is not only inefficient but also dangerous, increasing the risk of kickback. Mastering the art of sharpening will significantly improve your chainsaw’s performance and your safety.

Understanding Chain Sharpening

Before you start sharpening, it’s essential to understand the angles and geometry of the cutter. The key angles are:

Top Plate Angle: The angle of the top cutting edge of the cutter.
Side Plate Angle: The angle of the side cutting edge of the cutter.
Depth Gauge Height: The height of the depth gauge relative to the cutter.

Technical Requirement: The recommended top plate angle for most chainsaw chains is 30-35 degrees, and the side plate angle is 60-70 degrees. The depth gauge should be set approximately .025″ below the top of the cutter.

Sharpening Tools: Choosing the Right Equipment

There are several tools available for sharpening chainsaw chains. The most common are:

Round File and File Guide: This is the most basic and affordable option. It requires practice and skill to achieve consistent results.
Electric Chain Sharpener: This tool uses a grinding wheel to sharpen the cutters. It’s faster and more precise than a round file but can be more expensive.
Handheld Grinder: Similar to an electric chain sharpener, but more portable.
Chain Grinder: This is a bench-mounted machine that provides the most accurate and consistent sharpening results. It’s ideal for professional users.

Personal Story: I remember when I first started sharpening chains, I relied solely on a round file and file guide. It took me a while to get the hang of it, and my results were often inconsistent. Eventually, I invested in an electric chain sharpener, which significantly improved my sharpening accuracy and speed.

Sharpening with a Round File: A Step-by-Step Guide

Sharpening with a round file is a skill that every chainsaw user should learn. Here’s a detailed guide:

Secure the Chainsaw: Clamp the chainsaw in a vise or secure it to a workbench.
Choose the Right File: Use a round file that matches the chain’s pitch. For a 3/8″ low profile chain, a 5/32″ file is typically used.
Use a File Guide: A file guide helps maintain the correct sharpening angles.
Position the File: Place the file in the cutter, aligning it with the file guide. The file should be angled slightly upwards.
Sharpen the Cutter: Push the file through the cutter, following the curve of the cutter. Use smooth, even strokes.
Count the Strokes: Use the same number of strokes for each cutter to ensure consistent sharpening.
Sharpen All Cutters: Repeat the process for all cutters on the chain.
Check the Depth Gauges: Use a depth gauge tool to check the height of the depth gauges. If they are too high, file them down using a flat file.

Practical Tip: When sharpening with a round file, always file from the inside of the cutter outwards. This helps prevent the file from slipping and damaging the cutter.

Sharpening with an Electric Chain Sharpener: A Detailed Guide

An electric chain sharpener makes sharpening faster and more precise. Here’s how to use one:

Mount the Sharpener: Secure the sharpener to a workbench.
Adjust the Angles: Set the sharpening angles according to the chain manufacturer’s recommendations.
Position the Chain: Place the chain in the sharpener, aligning the cutter with the grinding wheel.
Sharpen the Cutter: Lower the grinding wheel onto the cutter, using light pressure.
Count the Seconds: Use the same amount of time for each cutter to ensure consistent sharpening.
Sharpen All Cutters: Repeat the process for all cutters on the chain.
Check the Depth Gauges: Use a depth gauge tool to check the height of the depth gauges. If they are too high, file them down using a flat file.

Safety Note: Always wear safety glasses when using an electric chain sharpener.

Depth Gauge Adjustment: Maintaining Optimal Cutting Performance

The depth gauges, also known as rakers, control the amount of wood each cutter takes with each pass. If the depth gauges are too high, the chain will not cut effectively. If they are too low, the chain will be too aggressive and prone to kickback.

Use a Depth Gauge Tool: Place the depth gauge tool on the chain, aligning it with the depth gauges.
Identify High Depth Gauges: Any depth gauges that protrude above the tool should be filed down.
File the Depth Gauges: Use a flat file to file down the high depth gauges, following the contour of the tool.
Round the Front Edge: Use a round file to round the front edge of the depth gauges.
Check the Depth Gauges: Recheck the height of the depth gauges with the tool. They should be flush with the tool.

Technical Detail: The recommended depth gauge setting for most chainsaw chains is .025″ below the top of the cutter.

Troubleshooting Sharpening Problems

Even with the best techniques, you may encounter problems when sharpening your chainsaw chain. Here are some common issues and their solutions:

Chain Cuts Unevenly: This can be caused by inconsistent sharpening angles or dull cutters on one side of the chain. Resharpen the chain, paying close attention to the angles.
Chain Smokes When Cutting: This indicates that the chain is dull or the depth gauges are too high. Sharpen the chain and adjust the depth gauges.
Chain Kicks Back: This can be caused by excessively low depth gauges or improper sharpening techniques. Check the depth gauges and resharpen the chain.
Chain Dulls Quickly: This can be caused by cutting dirty wood or using the wrong type of chain. Use a semi-chisel chain for dirty wood and avoid cutting in dirt.

Data Point: A study by the Forest Products Laboratory found that properly sharpened chains can increase cutting efficiency by up to 50%.

Safety Precautions When Sharpening

Sharpening a chainsaw chain can be dangerous if proper precautions are not taken. Here are some essential safety tips:

Wear Safety Glasses: Protect your eyes from flying debris.
Wear Gloves: Protect your hands from sharp cutters.
Secure the Chainsaw: Clamp the chainsaw in a vise or secure it to a workbench.
Use the Right Tools: Use the correct file size and angle for your chain.
Follow the Instructions: Read and follow the instructions for your sharpening tools.
Take Your Time: Don’t rush the sharpening process.
Stay Focused: Pay attention to what you are doing.
Don’t Sharpen in Direct Sunlight: The glare can make it difficult to see the cutters.

Idiom Alert: “Measure twice, cut once” applies perfectly to chainsaw sharpening. Take the time to do it right the first time, and you’ll avoid costly mistakes.

Advanced Chain Maintenance and Troubleshooting

Beyond basic sharpening and lubrication, several advanced maintenance techniques can further extend the life of your chainsaw chain and optimize its performance.

Chain Break-In Procedure

New chainsaw chains, much like a new engine, benefit from a break-in period. This helps the components settle and reduces the risk of premature wear.

Initial Lubrication: Before the first use, soak the new chain in bar and chain oil for at least 30 minutes. This ensures thorough lubrication of all components.
Gentle Cutting: For the first few cuts, avoid forcing the chain through the wood. Let the chain do the work and avoid applying excessive pressure.
Frequent Tension Checks: New chains tend to stretch slightly during the initial break-in period. Check the chain tension frequently and adjust as needed.
Early Sharpening: After the first hour of use, sharpen the chain, even if it doesn’t seem dull. This removes any burrs or imperfections that may have developed during manufacturing.

Technical Detail: The break-in period for a chainsaw chain typically lasts for the first 1-2 hours of use.

Chain Rotation and Wear Patterns

Chainsaw chains wear unevenly due to various factors, such as cutting technique, wood type, and sharpening practices. Rotating the chain can help distribute the wear more evenly and extend its lifespan.

Regular Inspection: Inspect the chain regularly for signs of wear, such as rounded cutters, damaged tie straps, or excessive stretching.
Chain Rotation: After every few sharpening sessions, rotate the chain on the guide bar. This ensures that both sides of the chain wear evenly.
Guide Bar Maintenance: Periodically flip the guide bar over to distribute wear evenly on both rails.
Sprocket Inspection: Check the sprocket for wear. A worn sprocket can damage the chain and reduce cutting performance.

Practical Tip: Keep a log of chain usage and maintenance activities, including sharpening dates, chain rotations, and sprocket inspections. This will help you track chain wear and optimize maintenance intervals.

Identifying and Addressing Common Chain Problems

Even with proper maintenance, chainsaw chains can experience various problems. Here’s a troubleshooting guide:

Chain Jumps Off the Bar: This can be caused by a loose chain, a worn sprocket, or a damaged guide bar. Tighten the chain, replace the sprocket, or repair the guide bar.
Chain Cuts at an Angle: This indicates that the cutters on one side of the chain are duller than the cutters on the other side. Resharpen the chain, paying close attention to the angles.
Chain Vibrates Excessively: This can be caused by a bent chain, a damaged guide bar, or a loose sprocket. Replace the chain, repair the guide bar, or tighten the sprocket.
Chain Cuts Slowly: This indicates that the chain is dull or the depth gauges are too high. Sharpen the chain and adjust the depth gauges.
Chain Breaks Frequently: This can be caused by a worn chain, a damaged guide bar, or excessive chain tension. Replace the chain, repair the guide bar, and adjust the chain tension.

Case Study: I once encountered a situation where a chainsaw chain kept breaking repeatedly. After a thorough inspection, I discovered that the guide bar was slightly bent. Replacing the guide bar resolved the problem and prevented further chain breakage.

Chain Lubrication: Beyond the Basics

Proper chain lubrication is critical for reducing friction, preventing wear, and dissipating heat. Here are some advanced lubrication tips:

Use High-Quality Oil: Use a bar and chain oil that is specifically designed for chainsaw chains. Avoid using motor oil or other substitutes, as they may not provide adequate lubrication.
Adjust Oil Flow: Adjust the oil flow rate on your chainsaw to match the cutting conditions. Increase the oil flow for heavy cutting or hot weather.
Check Oil Level: Regularly check the oil level in the oil reservoir and refill as needed.
Clean Oil Ports: Periodically clean the oil ports on the guide bar to ensure proper oil flow.
Consider Biodegradable Oil: If you are working in environmentally sensitive areas, consider using a biodegradable bar and chain oil.

Technical Detail: The optimal oil flow rate for a chainsaw chain is approximately one drop of oil per second.

Chain Storage: Protecting Your Investment

Proper chain storage is essential for preventing rust, corrosion, and damage. Here are some storage tips:

Clean the Chain: Clean the chain thoroughly before storing it. Remove any sawdust, debris, or oil.
Lubricate the Chain: Apply a light coat of bar and chain oil to the chain to prevent rust.
Store in a Dry Place: Store the chain in a dry place, away from moisture and humidity.
Use a Chain Case: Store the chain in a chain case or container to protect it from damage.
Avoid Direct Sunlight: Avoid storing the chain in direct sunlight, as this can cause the oil to break down.

Idiom Alert: “An ounce of prevention is worth a pound of cure” applies perfectly to chainsaw chain maintenance and storage. Taking the time to properly maintain and store your chain will save you time and money in the long run.

Safety Considerations for Chainsaw Operation

Operating a chainsaw is inherently dangerous, and safety should always be your top priority. Here are some essential safety considerations:

Personal Protective Equipment (PPE)

Wearing the proper PPE is crucial for protecting yourself from injury. The following PPE is recommended:

Chainsaw Chaps: These provide protection to your legs, which are the most commonly injured body parts in chainsaw accidents.
Safety Glasses or Face Shield: Protect your eyes from flying debris.
Hearing Protection: Chainsaws are loud and can cause hearing damage.
Gloves: Protect your hands from cuts and abrasions.
Steel-Toed Boots: Protect your feet from falling objects.
Helmet: Protect your head from falling branches or kickback.

Technical Requirement: Chainsaw chaps should be made of ballistic nylon or other cut-resistant material.

Safe Cutting Techniques

Using safe cutting techniques can significantly reduce the risk of accidents. Here are some essential techniques:

Maintain a Firm Grip: Always maintain a firm grip on the chainsaw with both hands.
Keep Your Balance: Maintain a stable stance and avoid overreaching.
Plan Your Cut: Before making a cut, assess the situation and plan your cut carefully.
Avoid Cutting Above Your Head: Cutting above your head is dangerous and should be avoided.
Be Aware of Kickback: Kickback is a sudden, uncontrolled movement of the chainsaw that can cause serious injury. Be aware of the risk of kickback and take steps to prevent it.
Use Proper Body Positioning: Position your body so that you are not in the direct line of the chain.
Clear the Work Area: Clear the work area of obstacles and debris.

Data Point: According to the Consumer Product Safety Commission, approximately 36,000 chainsaw-related injuries occur each year in the United States.

Chainsaw Maintenance and Inspection

Regular chainsaw maintenance and inspection are essential for ensuring safe operation. Here are some key maintenance and inspection tasks:

Check Chain Tension: Check the chain tension before each use.
Inspect the Chain: Inspect the chain for damage or wear.
Check the Guide Bar: Check the guide bar for damage or wear.
Lubricate the Chain: Lubricate the chain before each use.
Sharpen the Chain: Sharpen the chain regularly.
Check the Throttle: Check the throttle for proper operation.
Check the Safety Features: Check the chain brake and other safety features for proper operation.

Practical Tip: Keep a maintenance log for your chainsaw, recording all maintenance and inspection activities.

Emergency Procedures

It’s essential to know what to do in case of an emergency. Here are some emergency procedures:

Stop the Chainsaw: Immediately stop the chainsaw if an accident occurs.
Assess the Situation: Assess the situation and determine the extent of the injuries.
Call for Help: Call for help if necessary.
Provide First Aid: Provide first aid to the injured person.
Transport the Injured Person: Transport the injured person to a medical facility if necessary.

Idiom Alert: “Better safe than sorry” is a good motto to live by when operating a chainsaw. Always prioritize safety and take the necessary precautions to prevent accidents.

Conclusion: Mastering the Art of Chainsaw Operation

Choosing the right chain for your Stihl MS170 and mastering the art of professional sharpening are essential for achieving optimal performance, extending the life of your equipment, and ensuring your safety. By understanding the components of a chainsaw chain, selecting the appropriate chain for your needs, and practicing proper sharpening techniques, you can significantly improve your chainsaw skills and become a more efficient and safer operator. Remember to always prioritize safety and follow the recommended maintenance procedures to keep your chainsaw in top condition. With dedication and practice, you can master the art of chainsaw operation and tackle any wood-processing task with confidence.