String Trimmer Line & Replacement Line

What is trimmer line? Trimmer line is the replaceable cutting cord used in string trimmers, weed eaters and some walk-behind high-wheel trimmers. Mow Town USA offers replacement trimmer line in multiple diameters, shapes, spool sizes and pre-cut lengths for residential, commercial and heavy-duty trimming.

Shop by the diameter recommended by your trimmer manufacturer, then compare line shape, package size and intended application. This collection includes common sizes such as .080, .095, .105, .120, .130, .155 and .170 inch line, along with small loops, donuts, medium and large spools, bulk commercial spools and pre-cut pieces.

How to Choose the Correct Trimmer Line

1. Match the line diameter

Check the trimmer head, owner’s manual or existing line before ordering. Using line that is too thick can prevent proper feeding or overload the trimmer. Line that is too thin may wear quickly in heavy grass and weeds.

• .080 inch: commonly used for lighter residential trimming and grass.
• .095 inch: a popular general-purpose size for medium-duty trimming.
• .105 to .130 inch: suited to heavier weeds, larger trimmers and frequent use when approved by the equipment manufacturer.
• .155 to .170 inch: heavy-duty line used by compatible commercial or high-wheel trimming equipment.

2. Select the line shape

Round line is a versatile choice for routine trimming. Shaped lines, including diamond and twisted or aerodynamic designs, are intended to provide different cutting characteristics. Choose the shape that matches your equipment and the type of vegetation being cut.

3. Choose the package format

• Loops and small donuts: convenient for occasional use or smaller jobs.
• Medium and large spools: useful for homeowners, landscapers and repair shops that refill trimmer heads regularly.
• Bulk commercial spools: designed for higher-volume use.
• Pre-cut line: sized pieces for compatible fixed-line or high-wheel trimmer heads.

Frequently Asked Questions

What trimmer line size do I need?

Use the diameter listed in the trimmer owner’s manual, on the trimmer head or on the original spool. The correct size is determined by the equipment, not only by the thickness of the weeds.

Can I use thicker line in my string trimmer?

Only when the manufacturer approves that diameter. Thicker line may not feed correctly and can place additional load on the trimmer motor, clutch or drive system.

What is the difference between round and shaped trimmer line?

Round line is commonly used for general trimming and tends to feed smoothly. Diamond, twisted and other shaped lines have cutting edges or profiles designed for different trimming conditions. Performance also depends on the trimmer head and equipment power.

What do .080, .095 and .105 mean?

These numbers indicate the approximate line diameter in inches. For example, .095 line is approximately 0.095 inch thick.

How do I know whether pre-cut line will fit?

Check the required line diameter and length for the fixed-line or high-wheel trimmer head. Match both measurements and review the product description before ordering.

Is all trimmer line universal?

No. Many replacement lines fit multiple brands, but the trimmer must support the selected diameter and the package format must work with its cutting head.

How should trimmer line be stored?

Keep it in a clean, dry location away from prolonged heat and direct sunlight. Follow any storage guidance supplied by the line manufacturer.

Find the Right Replacement Line

Compare each listing by part number, diameter, length, shape and spool format. For help identifying a compatible product, visit our Frequently Asked Questions page or contact Mow Town USA with your trimmer brand, model number and current line size.