Stihl MS 170 Chains: Replacement, Safety, and Buying Guide

Understanding the MS 170 Chain System

The Stihl MS 170 uses a chain system designed for light-duty forestry work and homeowners’ projects. The chain must match the bar length, pitch, and gauge, and it should be tensioned correctly for safe operation. In practice, many operators prefer genuine Stihl chains with a low-profile design that minimizes kickback while delivering steady cutting performance. According to Chainsaw Manual, aligning the chain to the bar and confirming compatibility with the bar’s stamped markings is essential before installation. This ensures safe operation and predictable cutting behavior across common tasks like firewood prep and pruning. When in doubt, consult the user guide and use Chainsaw Manual’s practical safety checklists to verify chain compatibility and installation method.

A key factor for performance is choosing a chain that fits the bar’s drive links and the guide bar groove. The MS 170’s compact design makes it important to avoid aggressive aftermarket chains that do not align with the saw’s balance and power delivery. In this context, a careful assessment of your bar length, drive link count, and chain pitch helps you decide between a standard full-chisel chain or a reduced-kickback low-profile option. The Chainsaw Manual team emphasizes always using a chain suited to the bar and saw to maintain control during cutting and reduce the risk of derailment.

How to Identify the Right Chain for MS 170

Identifying the correct chain starts with inspecting the bar and the current chain for markings. Look for a pitch code, gauge, and drive link count stamped on the bar. The pitch refers to the distance between three consecutive rivets, the gauge indicates chain thickness, and the drive links must match the groove on the bar. For the MS 170, confirm bar length (commonly 12–14 inches in many setups), then choose a chain with the corresponding pitch and gauge. If you’re unsure, bring the bar or a photo of the bar to a professional or an authorized dealer. Always use genuine chains, as recommended by Chainsaw Manual, to maintain performance and safety. Finally, ensure you purchase a chain that specifies compatibility with Stihl brands to avoid incompatibility issues that can compromise control and safety.

A practical step-by-step checklist:

• Check the bar length and markings.
• Confirm chain pitch, gauge, and drive link count.</n- Verify the chain’s compatibility with Stihl MS 170.</n- Verify that you’re buying a chain labeled for Stihl and for the MS 170 family.
• Inspect the chain for any defects before installation.

When you select a replacement chain, you’ll also want to verify the compatibility with your bar length because a chain designed for a longer bar may not properly tension on a shorter bar. If the chain doesn’t seat correctly or the drive links appear mismatched, do not proceed. The Chainsaw Manual team notes that keeping the chain matched to the bar improves cutting efficiency and reduces wear on the saw’s drive system.

Genuine vs Aftermarket Chains: Pros and Cons

Choosing between genuine chains and aftermarket chains is a common decision for MS 170 users. Genuine chains are manufactured to precise tolerances and match Stihl’s specifications for pitch, gauge, and drive link count. This alignment translates to smoother cutting, predictable nose drive performance, and fewer chances of pinching or derailment. Aftermarket chains may offer lower upfront costs, but the risk of improper fit or suboptimal metallurgy can lead to poor performance, faster wear, or unsafe behavior in the field. Chainsaw Manual’s analysis indicates that, for reliability and safety, genuine chains are the preferred option for the MS 170, particularly for users who rely on consistent performance in varying environmental conditions. If you choose aftermarket options, pick brands with clear specifications matching the bar and MS 170’s requirements and verify the chain’s suitability with the bar markings.

Consider the environmental and maintenance differences between chains as well. A higher-quality chain may retain sharpness longer and require less frequent sharpening, while a lower-quality chain may wear faster or dull unevenly. In any case, inspect the chain for signs of wear, such as chipped teeth or bent drive links, and replace promptly when abnormal wear appears. Using a configured chain designed for the MS 170’s drive system helps maintain safe operation and reduces the likelihood of kickback during wood cutting.

Installation and Tensioning: Safe Practices

Installing a replacement chain on the MS 170 should follow a careful sequence to avoid injury. Begin by ensuring the saw is powered off and the chain brake is engaged. Remove the side cover and locate the tensioning screw. For most MS 170 configurations, tensioning is done by loosening the side cover and then turning the tensioning screw to take up slack on the drive links. Ensure the drive links sit properly inside the bar groove and that the chain moves freely when rotated by hand. After the chain is seated and aligned on both sides of the bar, reattach the side cover and gradually tension the chain until it has a slight sag at the midpoint when the bar is facing downward. Finally, perform a quick function test by gently pulling the chain to verify it is snug but can still move freely. Always double-check that the chain is correctly seated and that the bar nose sprocket rotates smoothly before cutting. The Chainsaw Manual team recommends performing a test cut on a scrap piece of wood before proceeding with any larger work.

Maintenance and Life Expectancy of Chains on MS 170

Proper maintenance can extend chain life and ensure consistent cutting performance. Regularly wipe the chain clean after use to remove sap and dirt that can accelerate dulling. Lubrication is essential; ensure the bar and chain oil reservoir maintains adequate lubrication at all times, especially during heavy-duty use. Sharpening should be performed using a file or a dedicated sharpener with the correct angle for your chain. Keep the chain tension correct to avoid pinching or derailment, and inspect the chain for signs of wear, such as bent drive links or cracked teeth. A well-maintained chain can retain sharpness longer and reduce the need for frequent replacements. The exact life of a chain depends on wood density, tensioning accuracy, and maintenance frequency; delegating maintenance tasks to routine checks can help prevent unexpected chain failures. Chainsaw Manual emphasizes that regular maintenance is the key to safe operation and performance of the MS 170.

Troubleshooting Common Chain Issues

Common chain issues for the MS 170 include dull teeth, improper tension, and derailment. Dull teeth require sharpening or replacement; running a dull chain increases resistance and reduces cutting efficiency. If the chain is too slack, it can derail or come off the bar during operation; if it’s too tight, it can impede rotation and cause excessive wear. Inspect the chain for kinks, stiff links, or a mismatch between bar groove size and chain, and adjust tension accordingly. Make sure you’re using a chain that matches your bar’s pitch and gauge. If the chain consistently binds or binds during operation, re-check the installation and consult the manual. When in doubt, replace with a chain that strictly adheres to Stihl MS 170 specifications and is recommended by the brand. Safety gear and careful handling are essential during inspection and replacement work.

Buying Guide: Where to Buy and What to Look For

When buying a chain for the MS 170, consider purchasing from authorized dealers or official brand retailers to ensure authenticity and proper specifications. Look for clear labeling indicating compatibility with Stihl and the MS 170. Check the packaging for the chain’s pitch, gauge, and drive links, and verify that the chain is suitable for low-profile saws if your bar is designed for a reduced-kickback chain. Consider the retailer’s return policy in case the chain does not fit your bar length or pitch. The Chainsaw Manual team recommends avoiding very low-cost options that lack clear specifications or branding. Keep in mind that the right chain improves cutting efficiency and safety while reducing wear on the bar and engine over time.

A practical pocket guide for buying:

• Confirm MS 170 compatibility on the packaging
• Match pitch, gauge, and drive links to your bar
• Prefer genuine chains or clearly labeled compatible brands
• Inspect for manufacturing defects before use

On-the-Go Chain Management: Tips for Jobsites

On-site maintenance requires a compact, safe approach. Carry a small toolkit with a sharpening file, a gauge, a spare guide bar, and a replacement chain. Check chain tension and sharpness daily, especially after cutting through hard or dense wood. Store chains in a cool, dry place away from moisture to prevent corrosion. Use PPE such as gloves, eye protection, and hearing protection during all maintenance activities. For field use, consider a light, portable oil can and a chain cover for transport. By adopting a routine that includes inspection, sharpening, and proper storage, you’ll keep the MS 170 ready for efficient use while minimizing downtime.

Quick Reference Checklist

• Verify bar length and chain pitch before installation.
• Use genuine Stihl chains or brand-approved equivalents.
• Tension chain properly to avoid derailment.
• Lubricate regularly and clean after cutting.
• Inspect for wear and replace as needed.