Stihl USG Grinder Angles (Sharpening Chart)
The STIHL USG does not have one angle setting for every chain. Start with the chain’s exact designation, then use its STIHL sharpening chart and the matching USG instruction chart to set the wheel, cutter angles, and depth gauge. A 30° top-plate angle is common on crosscut chains, but ripping chains and other profiles may require different settings.
A chain that makes dust instead of chips can tempt you to change the grinder settings by guesswork. Resist that urge. The wrong angle or wheel profile can change the cutter shape, while an incorrect depth-gauge setting can make a chain cut poorly or grab too hard.
I set up a USG by identifying the chain first, not by looking at the saw’s bar length or engine size. That small step prevents a common mistake: treating a familiar setting as a universal one. Use the checks and chart below to find the right starting point, then confirm every value for the chain you have.
Identify the chain before setting the USG
The chain designation identifies the cutter profile and other details that control sharpening. Pitch alone is not enough to choose every grinder setting. Read the chain markings or identify the chain from STIHL’s documentation, then match that designation to both the USG chart and the chain’s sharpening specifications.
A bar’s length and a saw’s engine size do not identify chain geometry. If the chain marking is worn or unclear, do not guess from appearance alone. Check the saw or bar documentation, or ask a STIHL dealer to confirm the chain before grinding.
| What to identify | Why it matters | Where to confirm |
|---|---|---|
| Chain designation | Links the chain to its sharpening profile and settings | Chain markings or STIHL chain information |
| Pitch | Helps confirm compatibility with the bar and sprocket | Chain, bar, or saw documentation |
| Gauge and drive-link count | Confirm that the chain fits the guide bar and drive system | Chain and saw specifications |
| Cutting application | Crosscut and ripping chains may use different geometry | Exact chain sharpening chart |
The core rule is simple: never use one general “STIHL angle” for every chain. The USG chart and the sharpening specification for the exact chain designation take priority over a generic chart or remembered setting.
STIHL USG angle chart: what to verify
An angle setting describes the cutter geometry the grinder is meant to reproduce. The top-plate angle is the angle across the cutter’s top edge; side-plate angle and grinder-head tilt also affect the finished shape. Their correct values depend on the chain profile, so confirm them in the exact STIHL chart before making a pass.
| Setting or feature | Reference point | What to do |
|---|---|---|
| Top-plate angle | Cutter’s top edge, viewed from above | 30° is common for STIHL crosscut chains; verify the chain chart |
| Ripping-chain top-plate angle | Cutter’s top edge for ripping use | 10° applies to certain ripping chains only; use it only when specified |
| Side-plate angle | Cutter side profile | Set from the chain-specific USG chart |
| Grinder-head tilt | Wheel position relative to the cutter | Set from the USG chart for that chain |
| Depth-gauge clearance | Height difference between cutter and depth gauge | 0.65 mm (0.025 in) is common on many STIHL chains, not universal |
| Wheel profile and size | Shape and dimensions of the grinding wheel | Match the chain designation to STIHL’s USG chart |
The values in the table are reference points, not a replacement for the chain chart. In particular, do not apply 30° or 0.65 mm to every chain. Some chain types require different settings, and a wrong wheel profile can change the cutter geometry even if the angle scale looks right.
Prepare the grinder and chain safely
The USG is a bench grinder for chains; it is not a tool for sharpening a chain on a running saw. Before adjusting the grinder, disconnect it from power. Check that the wheel is suitable for the chain and rated for the grinder’s speed. Inspect it for cracks or damage, and keep the guards in place.
Wear eye protection and suitable respiratory protection, secure the grinder, and keep hands clear of the wheel. Grinding can create dust and sparks. Follow the USG manual for wheel inspection, dressing, and machine setup.
Before fitting the chain in the grinder:
- Confirm the chain designation and the required wheel profile.
- Check the cutters for cracks, damage, severe wear, or missing parts. Do not grind a chain with damaged cutters.
- Confirm the chain is held securely in the fixture and oriented correctly.
- Set the top-plate angle, side-plate settings, and grinder-head tilt from the exact chart.
- Make sure the wheel is dressed as specified and does not contact parts of the chain it should not touch.
If a scale or pointer is hard to read, stop and resolve that before grinding. A small, deliberate check is better than making a row of cutters with a setting you cannot verify.
Sharpen cutters evenly without overheating
A controlled pass removes only enough material to restore the cutter edge. Set the grinder using the chain-specific chart, then work with light, consistent contact. Avoid holding the wheel against the cutter long enough to overheat it. Blue or discolored metal is a warning that the cutter has been overheated.
Start with the shortest cutter, then bring the cutters on the opposite side to a matching length. Matching cutter length helps the chain cut evenly. Do not keep grinding a cutter just to make it look bright; remove only what is needed to restore the edge, while staying within the chain’s wear limits.
A practical sequence is:
- Set the grinder and fixture from the chain’s USG chart.
- Identify the shortest serviceable cutter.
- Grind one side with light, controlled passes.
- Turn or reset the fixture as directed for the opposite cutters.
- Match the cutter lengths on both sides.
- Inspect the cutters and confirm the cutting edges are consistent.
If the cutter will not clean up without removing excessive material, or if it is cracked or badly worn, stop. A grinder cannot make an unsafe or worn-out chain serviceable again. Replace damaged chain parts or the chain as appropriate.
Set depth gauges to the chain specification
A depth gauge controls how much wood each cutter can take. Its clearance is the height difference between the depth gauge and the cutter’s cutting edge. Too much clearance can make a chain grab aggressively and raise kickback risk; too little can make the chain cut poorly and encourage the operator to force the saw.
Use the correct depth-gauge tool for the chain specification. Do not estimate by eye, and do not lower depth gauges simply because the chain is cutting slowly. If the chain needs frequent forcing, check cutter sharpness, angles, and depth-gauge clearance before changing anything.
Many STIHL chains use 0.65 mm (0.025 in), but that figure is not universal. Confirm the value for the exact chain, then file or grind only the part of the depth gauge that the tool indicates. Follow the chain maker’s method and check the result consistently across the chain.
Shop scenarios: choosing and checking settings
These are practical setup examples, not claims that every chain in a category uses the same settings. In each case, the chain designation and its chart decide the final values.
| Shop situation | Safe approach | Avoid |
|---|---|---|
| A crosscut chain has a dull edge | Confirm its designation, then check whether the chain chart calls for the common 30° top-plate angle | Assuming every STIHL chain uses 30° |
| A chain is marked for ripping | Look up the ripping-chain specification; some call for a 10° top-plate angle | Applying 10° to a crosscut chain |
| The chain cuts slowly after sharpening | Recheck the wheel profile, cutter angles, cutter lengths, and specified depth-gauge clearance | Lowering the depth gauges by guesswork |
| The chain’s markings are unreadable | Verify the chain through saw, bar, or dealer documentation before choosing a wheel | Selecting settings based only on bar length or appearance |
The best “case study” in a shop is often a chain whose cutting problem disappears after the right specification is restored. If it still cuts poorly, inspect for wear or damage rather than repeatedly changing grinder angles.
Refit the chain and maintain the USG
After sharpening, confirm that the chain’s pitch, gauge, and drive-link count match the guide bar and sprocket. Fit it in the correct cutting direction and set tension to the saw manufacturer’s specification. With the engine off and chain brake released, check that the chain moves as the saw manual directs. Complete the maker’s prescribed checks before operating.
Sharpening is only one part of safe cutting. Use the saw’s operating manual, required protective equipment, and a jobsite risk assessment. A correctly sharpened chain does not replace those precautions.
After use, clean grinding dust from the USG and inspect the wheel, guards, clamp parts, and power cord. Store the wheel dry and protected from impact. Store sharpened chains clean, protect them from corrosion, and label them with their chain designation and sharpening date so settings do not get mixed up.
Next step: identify the chain, check its exact STIHL chart, and only then set the USG. That order is the quickest way to avoid a wrong-angle grind.
Frequently asked questions
These quick answers clarify the settings most often checked before using a STIHL USG. Treat the chain’s own sharpening specification and the USG instruction chart as final whenever a general reference differs.
What angle should I use on a STIHL USG?
Use the angle listed for the exact chain designation in the STIHL sharpening and USG charts. A 30° top-plate angle is common for crosscut chains, but it is not universal.
Is 30° correct for every STIHL chain?
No. Some chain profiles and applications use different settings. Confirm the top-plate angle from the chart for that chain.
When is a 10° top-plate angle used?
Some ripping-chain applications call for 10°. Use it only when the specification for the exact ripping chain says to do so.
What side-plate angle should I set?
There is no single value that applies to every chain. Set the side-plate angle and grinder-head tilt from the chain-specific USG chart.
Is 0.025 inch the right depth-gauge clearance?
It is a common value on many STIHL chains, but not all. Check the specified clearance for your chain and use the correct depth-gauge tool.
Can I choose a USG setting from bar length?
No. Bar length does not identify the chain’s cutter geometry. Identify the chain designation and pitch first.
How do I choose a grinding wheel?
Match the wheel profile and size to the chain designation using STIHL’s USG chart. Do not select a wheel by appearance alone.
Why are my cutters turning blue?
The cutter is overheating during grinding. Use lighter, controlled passes and follow the grinder instructions. Stop if a cutter is damaged or excessive material would need to be removed.
Should I lower the depth gauges if the chain cuts slowly?
No, not without checking the chain specification. First inspect sharpness, cutter length, angles, and specified depth-gauge clearance. Excessive clearance can make the chain grab aggressively.
Can I sharpen the chain while it is on the saw?
The USG is a bench grinder. Remove the chain and sharpen it at the secured grinder with the machine disconnected during adjustments.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
