Hipa FS45 C5-2 Trimmer Head Compatible with Stihl FS38 FS40 FS45 FS46 FS50 FS40CE FS45C FS46C FS50CEFSE60 String Trimmer Brush Cutter Replace 4006 710 2106

What It Is

This is an aftermarket trimmer head designed for Stihl curved-shaft string trimmers and brush cutters. It replaces OEM part 4006 710 2106 and is intended for residential trimming, edging, and light brush cutting.

Fitment & Compatibility

Before buying, confirm your machine is a Stihl model FS38, FS40, FS40CE, FS45, FS45C, FS46, FS46C, FS50, FS50CE, or FSE60. This head fits only Stihl models with a 25mm (1-inch) diameter output shaft and a M10x1.25 left-hand thread. It will not fit straight-shaft models or trimmers from other brands without an adapter. Measure your shaft diameter and thread direction—Stihl left-hand threads loosen clockwise.

Key Things to Know

• Installation difficulty: Easy—no tools required for the bump-feed head; hand-tighten onto the shaft. The trimmer line loads by pushing through eyelets, not winding a spool.
• Quality: Plastic housing is durable for residential use but may crack if you hit hard objects repeatedly. The bump-feed mechanism works reliably, but some users report occasional jamming with thick line.
• Line compatibility: Accepts 0.095-inch (2.4mm) diameter line; thicker line may not feed smoothly. Use Stihl or generic round line for best results.
• Common gotcha: The head may not seat fully on older shafts with wear or burrs. Clean the shaft threads before installation. If the head wobbles, check that the retaining nut is fully tightened.

Should You Buy It

Buy this if you own one of the listed Stihl curved-shaft trimmers and want an affordable, direct replacement for a worn or broken OEM head. It’s a good value for light to medium residential use, but if you trim heavy brush or need professional durability, consider the OEM part instead.