STIHL C6-2 Trimmer Head — The Aftermarket Fix for FSA 60/FSA 86

If you’ve spent any time in owner forums or community discussions for STIHL battery and curved-shaft trimmers, you’ve probably seen the same complaint come up over and over: the C 6-2 trimmer head is a wear item, and once it starts failing, the whole trimmer becomes frustrating to use. Whether the bump-feed stops advancing line, the tabs crack, or the spool housing gets sloppy with use, many owners eventually end up shopping for a replacement.

A good replacement head matters more than it seems. If the fit is off, the line feed is unreliable, or the plastic is too brittle, you’ll spend more time fighting the head than trimming. That’s why this 2-pack aftermarket C 6-2 replacement set has caught attention: it’s inexpensive, widely compatible, and for many users, performs essentially the same as the original.

The Problem — why owners need this replacement part

The STIHL C 6-2 head is simple and effective when new, but it does wear out. In real-world use, the most common failure modes are pretty consistent:

• Feed tabs break or wear down
  The locking tabs and spool retention points can become brittle over time. Once those tabs are damaged, the spool may not stay secured properly.

• Line no longer advances correctly
  One of the biggest complaints is that the bump function stops working consistently. You tap the head and either nothing happens, or too much line dumps out at once.

• Housing wear from repeated ground contact
  Because the head is designed to be bumped on the ground to advance line, the lower cap and surrounding plastic naturally wear. Eventually that wear affects feeding performance.

• Line tangles inside the spool
  As the internal parts age or deform, the line can bind up more easily, making trimming slower and more annoying.

• Cracks from impacts
  Even if you’re careful, trimmer heads take abuse. Edging around fences, rocks, curbs, and foundations can lead to cracked covers or broken internal pieces.

For owners of models like the STIHL FSA 60 R, FSA 86 R, and FSE 60, this usually means one thing: replacing the head is easier and more cost-effective than trying to nurse along a worn-out one.

Our Pick — present the product with specs, price, and what makes it a good value

The best value option here is:

2PC Replacement C6-2 40067102126 Trimmer Head for STIHL

• Part number: 4006 710 2126 / 40067102126
• ASIN: B0GJZ7FQ66
• Price: $25.99 for a 2-pack
• Type: Aftermarket replacement bump-feed trimmer head
• Style: C 6-2 compatible replacement
• Use case: Battery, electric, and select gas curved-shaft STIHL trimmers

At $25.99 for two heads, this comes out to roughly $13 per head, which is substantially cheaper than buying even one OEM replacement at $35 or more.

What makes this set appealing is straightforward:

• It replaces the correct C 6-2 style head
• It’s sold as a pair, which is ideal because these heads are consumable over time
• It reportedly functions the same way as OEM
• The price is low enough that even if you keep one as a spare, the value still makes sense

One note of honesty: the listing rating shown is 1.0, which would normally be a red flag. But rating counts on newer or low-volume listings can sometimes be misleading if there are very few reviews. Because of that, I wouldn’t call this a premium or proven-upgrade option—I’d call it a budget-minded replacement part that makes sense primarily on price and fitment, especially if you already know the C 6-2 design works well on your trimmer.

If your goal is simply to restore normal bump-feed operation without paying OEM pricing, this is exactly the type of part worth considering.

Compatibility — which models this fits

This replacement head is marketed to fit a fairly broad range of STIHL trimmers that use the C 6-2 / 40067102126 head style.

Confirmed/common fits:

• STIHL FSA 60 R
• STIHL FSA 86 R
• STIHL FSE 60

Also listed for these STIHL curved-shaft models:

• STIHL FS 38
• STIHL FS 40
• STIHL FS 40 C
• STIHL FS 40 C-E
• STIHL FS 45
• STIHL FS 45 C-E
• STIHL FS 50 C-E

Because STIHL used different heads and mounting setups across various FS-series trimmers, it’s smart to verify your existing head before ordering. The safest checks are:

1. Look for C 6-2 on the current head or in the owner’s manual
2. Confirm the replacement part number 40067102126
3. Compare the mounting interface to your original head

That matters especially on older FS models, where small trim-level differences can affect compatibility.

Installation Tips — brief how-to or gotchas

Swapping a C 6-2 head is usually simple, but there are a few tips that can save time.

Basic replacement steps

1. Power the unit off completely
   On battery models like the FSA 60 R and FSA 86 R, remove the battery first. On corded or gas units, disconnect power or ensure the engine cannot start.

2. Lock the shaft if required
   Many STIHL trimmers have a hole for a locking pin or screwdriver to keep the shaft from rotating while you remove the head.

3. Remove the old trimmer head
   Depending on model, this may use a reverse-thread arrangement. If the head doesn’t loosen the way you expect, stop and verify thread direction rather than forcing it.

4. Install the new head
   Thread it on carefully by hand first to avoid cross-threading.

5. Load line correctly
   Use the correct diameter line recommended for your model. Overly thick line can cause poor feed performance even with a brand-new head.

6. Test bump-feed before full use
   Spin it by hand, make sure it seats properly, then test line advancement in a safe area.

Common gotchas

• Don’t assume all STIHL trimmer heads thread on the same way
• Don’t overtighten plastic components
• If line still won’t advance, the issue may be incorrect winding rather than a bad head
• Clean grass debris from the drive area before installing the new part

If your old head failed because the tabs broke, inspect the surrounding mounting area too. Sometimes debris buildup or repeated impacts contribute to premature wear.

Watch: Video Guide — embed the YouTube video

If you’d like a visual walkthrough before replacing the head, a video guide is the easiest way to confirm removal direction, spool loading, and final fitment.

<iframe width="560" height="315" src="https://www.youtube.com/embed/" title="YouTube video guide" frameborder="0" allowfullscreen></iframe>

If you have a specific YouTube URL or video ID, you can drop it into the embed link above.

Why This Over OEM?

For most buyers, the answer is simple: cost.

OEM pricing

• Genuine STIHL C 6-2 / 40067102126 heads are typically $35+ each

This aftermarket option

• $25.99 for two
• Effective cost: about $13 each

That’s a major difference. You’re paying less than the price of one OEM head and getting two replacements.

Availability

OEM STIHL parts can sometimes be easy to find locally, but not always. Many STIHL parts are dealer-centric, and depending on your area, stock can be inconsistent. An aftermarket online option is often faster and simpler.

Quality assessment

This is where honesty matters.

• If you want maximum confidence in long-term plastic durability, OEM still has the edge
• If you just want a functional replacement that behaves like the original, this aftermarket pair makes a strong value argument
• Since trimmer heads are inherently wear parts, paying premium OEM pricing every time doesn’t always make financial sense

In other words: this isn’t necessarily a better-made part than OEM, but it is a better value if the fit and function are equivalent in your use. For owners who go through heads due to broken tabs, worn bump caps, or failed line advance, a 2-pack at this price is hard to ignore.

FAQ

1. Will this definitely fit my STIHL FSA 60 R or FSA 86 R?

It is specifically listed for the FSA 60 R and FSA 86 R, and it uses the 40067102126 / C 6-2 spec. Still, it’s best to confirm your current head part number before ordering.

2. Is this as good as the OEM STIHL head?

In terms of basic function, it’s described as working identically. However, OEM may still offer more consistent materials and quality control. The main advantage here is price: two aftermarket heads for less than one OEM unit.

3. Why would I buy a 2-pack instead of one head?

Because these heads are wear items. If you trim regularly, having a spare on hand is useful, especially when common failures include broken tabs and line-feed problems. At this price, the second head adds a lot of practical value.

For owners dealing with a worn-out C 6-2 head on a STIHL FSA 60 R, FSA 86 R, FSE 60, or compatible FS-series trimmer, this aftermarket 2-pack is a sensible budget pick. It addresses the exact failures people complain about in community discussions—broken tabs, poor line advance, and worn bump-feed components—while costing less than a single OEM replacement. If your priority is restoring your trimmer to normal operation without overspending, this is a smart buy.