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Husqvarna FS 400 LV Blade Size

by Blades Admin

Husqvarna FS 400 LV Blade Size: Complete Guide to Compatible Diameters, Cutting Depth, and Blade Selection

Understanding the Husqvarna FS 400 LV blade size is essential for achieving clean cuts, maximum efficiency, and long-term reliability from this professional walk-behind concrete saw. Blade size directly affects cutting depth, performance in different materials, and overall jobsite productivity. Choosing the correct blade diameter—and the right blade type—ensures the FS 400 LV operates exactly as intended for concrete, asphalt, and maintenance cutting applications.

Manufactured by Husqvarna, the FS 400 LV is engineered to support multiple blade sizes, giving contractors flexibility to match blade diameter to job requirements without sacrificing control or accuracy.

What Blade Sizes Fit the Husqvarna FS 400 LV?

The Husqvarna FS 400 LV is designed to accommodate diamond blades ranging from 12 inches up to 20 inches in diameter, depending on configuration and blade guard setup. This wide compatibility makes the saw versatile enough for shallow surface cuts as well as deeper slab and pavement work.

Commonly used blade sizes include:

  • 12-inch diamond blades

  • 14-inch diamond blades

  • 16-inch diamond blades

  • 18-inch diamond blades

  • 20-inch diamond blades (maximum capacity)

Each blade size serves a different purpose, and selecting the correct one depends on cutting depth requirements, material type, and jobsite conditions.

Maximum Blade Size for the FS 400 LV

The maximum blade size for the Husqvarna FS 400 LV is 20 inches. When equipped with a 20-inch diamond blade, the saw can achieve a maximum cutting depth of approximately 7.5 inches, making it suitable for deeper concrete and asphalt cutting tasks without stepping up to a larger road saw.

This capability allows contractors to:

  • Cut thick concrete slabs

  • Perform deeper pavement repairs

  • Create clean access cuts for utility work

Using the maximum blade size also maximizes productivity by reducing the number of passes required.

Cutting Depth by Blade Size

Blade diameter directly determines how deep the FS 400 LV can cut. While exact depth can vary slightly based on blade design and wear, typical cutting depths are:

  • 12-inch blade: shallow cuts for scoring and light surface work

  • 14-inch blade: moderate-depth cuts for sidewalks and slabs

  • 16-inch blade: deeper cuts for pavement and thicker concrete

  • 18-inch blade: heavy-duty surface and repair work

  • 20-inch blade: maximum depth up to roughly 7.5 inches

Selecting the correct blade size ensures efficient cutting without overloading the saw or wearing blades prematurely.

Why Blade Size Matters on the FS 400 LV

Cutting Depth Requirements

Blade size determines whether a single pass will complete the cut or if multiple passes are needed. For expansion joints or shallow scoring, smaller blades are often sufficient. For structural or repair cuts, larger blades save time and labor.

Saw Balance and Control

The FS 400 LV is designed to remain balanced across its supported blade sizes. However, larger blades place more load on the drivetrain and require proper feed rate to maintain smooth operation.

Blade Cost and Wear

Larger blades typically cost more, but they can reduce total cutting time. Smaller blades may be more economical for light work and frequent shallow cuts.

Arbor Size and Blade Compatibility

In addition to diameter, blade compatibility depends on arbor size. The Husqvarna FS 400 LV typically uses a standard 1-inch arbor, which is common for walk-behind concrete saws.

When selecting a blade:

  • Ensure the arbor hole matches the saw

  • Use proper blade flanges

  • Confirm RPM rating meets or exceeds saw specifications

Correct arbor fit is critical for safety and cut accuracy.

Choosing the Right Blade Type by Material

Blade size alone is not enough—blade type must match the material being cut.

Concrete Diamond Blades

For concrete cutting, use blades designed for:

  • Green concrete or cured concrete

  • Hard or soft aggregate

  • Reinforced or non-reinforced slabs

Pairing the correct concrete blade with the appropriate size ensures smooth cutting and extended blade life.

Asphalt Diamond Blades

Asphalt blades typically feature:

  • Softer metal bonds

  • Wider gullets

  • Improved cooling characteristics

These blades are ideal for pavement and asphalt repair when used in 14-inch to 20-inch sizes on the FS 400 LV.

Common Blade Sizes and Their Best Uses

14-Inch Blade on the FS 400 LV

A 14-inch blade is commonly used for:

  • Sidewalk panels

  • Driveways

  • Light slab cutting

  • Shallow expansion joints

It offers a balance between cost, control, and cutting depth.

16-Inch Blade on the FS 400 LV

A 16-inch blade is ideal for:

  • Medium-depth concrete cuts

  • Pavement repair

  • Utility access cuts

This size provides added depth without moving to the maximum blade diameter.

18-Inch Blade on the FS 400 LV

An 18-inch blade is often chosen for:

  • Thicker slabs

  • Heavier repair work

  • Reduced number of cutting passes

It offers strong performance while maintaining manageable blade cost.

20-Inch Blade on the FS 400 LV

A 20-inch blade is best for:

  • Maximum cutting depth

  • Structural slab work

  • Deep pavement and asphalt cuts

This size fully utilizes the FS 400 LV’s cutting capacity.

Blade Guard and Setup Considerations

When changing blade sizes, ensure:

  • The blade guard matches the blade diameter

  • Water spray nozzles are aligned with the blade

  • Blade flanges are clean and undamaged

Proper setup ensures safe operation and optimal blade cooling.

Wet Cutting and Blade Size

The FS 400 LV is designed primarily for wet cutting. Larger blades especially benefit from proper water flow, which:

  • Cools the blade

  • Reduces dust

  • Prevents segment glazing

  • Extends blade life

Always verify water delivery before starting a cut, particularly with 18-inch and 20-inch blades.

Blade Size vs Productivity

Choosing the right blade size improves productivity:

  • Smaller blades are faster to spin up and ideal for quick jobs

  • Larger blades reduce passes and total cutting time on deep cuts

Matching blade size to the task avoids unnecessary wear and wasted effort.

Safety Considerations When Selecting Blade Size

Blade size affects safety and control. Operators should:

  • Never exceed the maximum rated blade size

  • Use blades with correct RPM ratings

  • Inspect blades before installation

  • Maintain proper feed pressure

Using an oversized or incorrect blade can damage the saw and create safety hazards.

Who Needs to Pay Attention to FS 400 LV Blade Size?

Understanding blade size is critical for:

  • Concrete contractors

  • Asphalt repair crews

  • Municipal maintenance teams

  • Utility contractors

  • Equipment rental operators

Correct blade selection ensures consistent performance across different job types.

FAQs About Husqvarna FS 400 LV Blade Size

What is the maximum blade size for the Husqvarna FS 400 LV?
The FS 400 LV supports blades up to 20 inches in diameter.

What cutting depth does a 20-inch blade provide on the FS 400 LV?
A 20-inch blade allows cutting depths of approximately 7.5 inches.

Can I use smaller blades on the FS 400 LV?
Yes. The saw supports multiple blade sizes, including 12", 14", 16", and 18".

What arbor size does the FS 400 LV use?
It typically uses a standard 1-inch arbor.

Is a 14-inch blade enough for sidewalk cutting?
Yes. A 14-inch blade is commonly used for sidewalks and light slab work.

Do different blade sizes require different guards?
Yes. Blade guards must match the blade diameter for safe operation.

Can I cut asphalt with the same blade size as concrete?
Yes, but the blade type must be designed specifically for asphalt.

Does blade size affect vibration?
Improper blade size or worn components can increase vibration. Proper setup minimizes this risk.

Is wet cutting required for larger blades?
Wet cutting is strongly recommended, especially for 18-inch and 20-inch blades.

How do I choose the best blade size for my job?
Choose based on required cutting depth, material type, and jobsite conditions.

Final Thoughts on Husqvarna FS 400 LV Blade Size

The Husqvarna FS 400 LV blade size range—from 12 inches up to a maximum of 20 inches—gives contractors exceptional flexibility for concrete and asphalt cutting. Selecting the correct blade diameter ensures proper cutting depth, efficient workflow, and long blade life. By matching blade size and blade type to the task at hand, operators can fully leverage the FS 400 LV’s precision, balance, and professional-grade performance across a wide range of jobsite applications.



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