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FS 400

by Blades Admin

FS 400: Complete Guide to the Husqvarna FS 400 Walk-Behind Concrete Saw

When professionals search for FS 400, they are almost always referring to the Husqvarna FS 400 walk-behind concrete saw platform, most commonly known in the field as the FS 400 LV. This compact yet powerful floor saw is widely used for concrete and asphalt cutting where precision, portability, and consistent results are more important than extreme cutting depth.

Manufactured by Husqvarna, the FS 400 has earned a strong reputation among contractors, municipalities, and maintenance crews for being reliable, easy to control, and highly versatile across a wide range of surface-cutting applications.

What Is the FS 400?

The FS 400 is a professional walk-behind floor saw designed for horizontal cutting in concrete and asphalt. It is not a large road saw intended for deep infrastructure cuts, nor is it a handheld cutoff saw. Instead, it fills the critical middle ground where clean, straight, and controlled surface cuts are required.

The FS 400 is commonly used for:

  • Concrete slab cutting

  • Expansion and control joints

  • Sidewalk and curb work

  • Asphalt and pavement repair

  • Utility and maintenance access cuts

Its compact footprint allows it to work efficiently in confined spaces while still delivering professional-grade cutting performance.

FS 400 Design Philosophy

Compact and Balanced Construction

One of the defining traits of the FS 400 is its balanced chassis design. Weight is distributed evenly over the blade, which helps the saw track straight during cuts and reduces the effort required from the operator. This balance is especially important during long, continuous cuts where even slight drift can lead to uneven results.

Built for Jobsite Durability

The FS 400 is engineered to withstand harsh cutting environments. Concrete slurry, abrasive asphalt dust, vibration, and frequent transport are all part of daily life for this saw. Its rugged frame, reinforced blade guard, and heavy-duty components are designed to hold up under consistent professional use.

Cutting Capabilities of the FS 400

Concrete Cutting Performance

The FS 400 is widely used for cutting cured and reinforced concrete in:

  • Residential slabs

  • Commercial floors

  • Warehouses and garages

  • Sidewalk panels

When paired with the correct diamond blade, the saw produces clean edges, consistent depth, and smooth operation across different concrete mixes and aggregate types.

Asphalt Cutting Performance

Asphalt is highly abrasive and demands stable blade control. The FS 400 performs exceptionally well in:

  • Pavement repair

  • Parking lot maintenance

  • Driveway cutting

  • Road patch preparation

Using an asphalt-specific diamond blade helps maximize blade life and cutting speed.

Blade Size Compatibility

The FS 400 supports multiple blade sizes, giving contractors flexibility to match blade diameter to job requirements. Depending on configuration, operators commonly use blades ranging from smaller diameters for shallow work up to larger blades for deeper cuts.

Larger blade sizes allow greater cutting depth, while smaller blades are ideal for scoring, joint cutting, and lighter surface work. This adaptability makes the FS 400 suitable for a wide range of cutting tasks without changing machines.

Precision Depth Control

Accurate depth control is essential in professional concrete cutting, especially for expansion and control joints. The FS 400 features a smooth, responsive depth-adjustment system that allows operators to set and maintain consistent cutting depth throughout the job.

This level of control:

  • Improves joint uniformity

  • Reduces rework

  • Enhances overall cut quality

Depth adjustments are easy to fine-tune, even while working on uneven surfaces.

Ergonomics and Operator Comfort

Smooth Handling and Low Vibration

The FS 400 is designed to minimize vibration transferred to the operator. Reduced vibration improves comfort during long cutting sessions and helps maintain control and accuracy.

Ergonomic Handle Layout

The handle system provides a comfortable, natural grip and steering position. This layout allows operators to guide the saw smoothly and maintain proper posture, reducing fatigue over extended periods of use.

Wet Cutting System

The FS 400 is designed primarily for wet cutting, which is the preferred method for both concrete and asphalt.

Wet cutting offers several advantages:

  • Dust suppression

  • Blade cooling

  • Extended blade life

  • Cleaner cuts

The integrated water system ensures consistent water flow to the blade, helping control silica dust and maintain safe jobsite conditions.

Typical Applications of the FS 400

Expansion and Control Joint Cutting

One of the most common uses of the FS 400 is cutting expansion and control joints in concrete slabs. Its straight-line stability and precise depth control make it ideal for creating uniform joints that help manage cracking.

Sidewalk and Curb Work

Municipal crews and contractors rely on the FS 400 for sidewalk and curb repair, where accuracy and clean edges are essential.

Pavement and Asphalt Repair

For light-to-medium pavement repair, the FS 400 delivers clean access cuts and well-defined patch boundaries without the bulk of larger road saws.

Utility and Maintenance Projects

Utility contractors use the FS 400 to create access points for pipes, conduits, and cables, especially in areas where space is limited.

Diamond Blade Selection for the FS 400

Choosing the right diamond blade is just as important as choosing the saw.

Concrete Diamond Blades

Concrete blades are designed for different hardness levels and aggregate types. Matching the blade to the material ensures smooth cutting and longer blade life.

Asphalt Diamond Blades

Asphalt blades typically feature softer bonds and wider gullets to handle the abrasive nature of pavement. Using the correct blade prevents overheating and premature wear.

Blade Safety and Fit

Blades should always match the saw’s specifications, including diameter and arbor size, and must be rated for the saw’s operating speed.

Maintenance and Long-Term Reliability

Proper maintenance keeps the FS 400 operating at peak efficiency.

Routine maintenance includes:

  • Cleaning slurry and debris after use

  • Inspecting belts and bearings

  • Checking blade condition and alignment

  • Verifying water system flow

  • Inspecting fasteners and guards

With regular care, the FS 400 can deliver many years of dependable service.

Safety Considerations

Concrete and asphalt cutting involve inherent risks, and proper safety practices are essential.

Operators should always use:

  • Eye and face protection

  • Hearing protection

  • Respiratory protection when required

  • Gloves with good grip

  • Steel-toe footwear

Ensuring blade guards and water systems are properly installed is critical before operation.

FS 400 vs Larger Floor Saws

The FS 400 excels in situations where:

  • Precision matters more than extreme depth

  • Space is limited

  • Portability is important

  • Jobs involve surface cutting rather than deep infrastructure work

For many contractors, it bridges the gap between handheld saws and large road saws.

Who Uses the FS 400?

The FS 400 is commonly used by:

  • Concrete contractors

  • Asphalt repair crews

  • Municipal maintenance teams

  • Utility contractors

  • Property maintenance professionals

Its versatility makes it suitable for both specialized and general cutting tasks.

FAQs About FS 400

What is the FS 400 used for?
The FS 400 is used for cutting concrete and asphalt on flat surfaces such as slabs, sidewalks, and pavements.

Is the FS 400 a walk-behind saw?
Yes. It is a compact walk-behind floor saw designed for straight horizontal cuts.

Is FS 400 the same as FS 400 LV?
In most cases, FS 400 refers to the FS 400 LV configuration used in the field.

Can the FS 400 cut asphalt?
Yes. With an asphalt-specific diamond blade, it performs very well on pavement and asphalt.

Does the FS 400 support wet cutting?
Yes. It includes an integrated water system for dust control and blade cooling.

What types of projects is the FS 400 best for?
It is ideal for residential, light commercial, municipal, and maintenance projects.

Is the FS 400 easy to transport?
Yes. Its compact design allows easy loading, transport, and storage.

What blades can be used with the FS 400?
It supports a wide range of concrete and asphalt diamond blades within its size specifications.

Is the FS 400 designed for professional use?
Yes. It is built specifically for professional contractors and demanding jobsites.

How accurate are cuts made with the FS 400?
The saw offers excellent straight-line tracking and precise depth control.

How long does an FS 400 typically last?
With proper maintenance, it can provide many years of reliable professional service.

Final Thoughts on FS 400

The FS 400 has become a staple in concrete and asphalt cutting because it delivers precision, reliability, and versatility in a compact walk-behind design. Its balanced construction, smooth handling, and compatibility with multiple blade sizes make it a practical solution for contractors who need consistent, high-quality cuts without the bulk of larger saws. For surface cutting applications where control and accuracy matter most, the FS 400 remains one of the most trusted choices on today’s jobsites.

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