Knew Concepts 8" Mk.IV Heavy Duty Fret Saw – Lever Tension

Take on larger workpieces and deeper interior cuts with the Knew Concepts 8" Mk.IV Heavy Duty Fret Saw with Lever Tension. Designed for jewelers, metalsmiths, model makers, and precision craftspeople who need more reach from their saw frame, the 8" Mk.IV combines an extra-deep throat with high blade tension, a rigid lightweight frame, and fast cam-lever blade changes.

The heavy-duty Mk.IV frame is designed to apply 50–60 pounds of blade tension, helping reduce blade vibration for controlled, responsive sawing. Its generous 8" throat depth provides substantially more clearance than the 3" and 5" models, making it an excellent choice for larger sheet metal, decorative panels, sculptural work, and intricate designs that extend farther into the workpiece.

The cam-lever tensioning system makes repeated blade changes quick and convenient. Release the lever to remove tension, reposition and clamp the blade, then return the lever to the cutting position. When replacing the blade with the same size, the established tension setting can be restored without starting over—particularly useful for projects involving numerous pierced interior cuts.

Features & Benefits

• 8" throat depth provides exceptional reach for larger workpieces
• Heavy-duty Mk.IV frame for increased rigidity
• Designed to produce 50–60 lb of blade tension
• High blade tension helps reduce vibration during precision sawing
• Cam-lever tensioning makes repetitive blade changes fast and convenient
• Excellent for piercing and multiple interior cuts
• Fixed blade orientation provides a straightforward, rigid sawing setup
• Aircraft-grade aluminum construction combines strength with manageable weight
• Weighs only 266.4 grams with blade
• Durable red powder-coated finish resists scratches and damage
• Supplied with a #7 Fix Blue premium fret saw blade
• Excellent for jewelry fabrication, metalsmithing, model making, and precision cutting
• Made in the USA

Specifications

8" Throat for Large & Deep Cuts

The defining advantage of the 124.008C is its 8-inch throat depth.

Throat depth determines how far the blade can travel into a workpiece before the material reaches the back of the saw frame. For small jewelry components, a 3" frame may be plenty. As the work gets larger, however, additional throat depth becomes increasingly valuable.

The 8" Mk.IV gives you considerably more room for:

• Large pierced designs
• Decorative sheet metal
• Sculptural jewelry
• Larger fabrication projects
• Metal panels
• Oversized pendants
• Model-making components
• Deep interior cuts
• Complex patterns extending far from an edge

For anyone who regularly reaches the limit of a smaller jeweler's saw, the 8" frame provides significantly more working capacity.

Heavy-Duty Mk.IV Frame

The Mk.IV is Knew Concepts' heavier-duty fret saw design, engineered to pull approximately 50–60 pounds of tension on the blade. Knew Concepts states that this higher-tension design produces less blade vibration than its Mk.III saws.

That combination of rigidity and blade tension provides a responsive sawing platform for detailed work.

It's particularly valuable when you're following:

• Long layout lines
• Intricate curves
• Detailed pierced patterns
• Interior contours
• Precision straight cuts
• Complex decorative designs

High Blade Tension for Greater Control

Proper blade tension plays an important role in precision sawing.

The Mk.IV's 50–60 lb tension design helps keep the blade taut and reduces unwanted vibration while cutting.

That can be particularly helpful with an 8" frame, where the goal is to combine the reach of a large saw with the controlled feel expected from a precision jeweler's or fret saw.

Fast Cam-Lever Blade Changes

The cam-lever tension system is especially useful for piercing.

Interior cuts require the blade to be repeatedly released, threaded through a starter hole, clamped again, tensioned, and then released for the next opening.

Knew Concepts designed the lever system specifically for this kind of repetitive blade changing. Flip the lever forward to release tension, reposition and clamp the blade, then flip the lever back to resume sawing.

When you're using the same blade size and it is installed correctly, you don't need to completely recreate your tension setting every time.

Excellent for Large Piercing Projects

The combination of an 8" throat and rapid lever tensioning makes this model particularly attractive for larger pierced designs.

The deeper frame allows the blade to reach farther into the workpiece, while the lever simplifies the repeated blade changes required for multiple interior openings.

That makes the 124.008C especially useful for:

• Large pierced jewelry
• Decorative metal panels
• Complex sheet-metal patterns
• Sculptural components
• Ornamental metalwork
• Model making
• Larger craft projects
• Precision fabrication

Aircraft-Grade Aluminum Frame

An 8" saw frame could become cumbersome if constructed like a traditional heavy steel frame.

Knew Concepts instead uses powder-coated aircraft-grade aluminum, allowing the Mk.IV to combine a large throat and high-tension design with relatively low overall weight.

The complete 124.008C weighs only 266.4 grams with the blade installed.

That is particularly important on a large-frame saw because reduced tool weight can make the 8" format more manageable during extended bench sessions.

Durable Powder-Coated Finish

The distinctive red Mk.IV frame is powder coated for durability.

Knew Concepts describes the finish as extremely resistant to scratching and damage, helping protect the frame during regular professional bench use.

Premium Blade Included

Knew Concepts supplies the 124.008C with a #7 Fix Blue premium fret saw blade already installed. 

Fixed Blade Position

The 124.008C uses fixed blade clamps.

That's an important distinction because Knew Concepts also offers 124.008CS, which combines the same 8" Mk.IV format with swivel blade clamps. Knew Concepts lists the two as separate models.

Choose the 124.008C if you want:

• 8" throat depth
• Heavy-duty Mk.IV construction
• 50–60 lb blade tension
• Fast cam-lever tensioning
• Conventional fixed blade orientation

If you also want to rotate the blade independently of the frame, the 124.008CS is the corresponding swivel-clamp model.

3" vs. 5" vs. 8" Mk.IV

Choose the 3" for small jewelry and maximum maneuverability.

Choose the 5" when you need additional reach without moving all the way to a large frame.

Choose the 8" when larger workpieces and deep interior cuts are the priority.

Ideal For

The Knew Concepts 8" Mk.IV Heavy Duty Fret Saw is an excellent choice for:

• Jewelry fabrication
• Large piercing projects
• Metalsmithing
• Silversmithing
• Goldsmithing
• Decorative metalwork
• Sculptural jewelry
• Sheet-metal fabrication
• Model making
• Precision cutting
• Larger workpieces
• Professional jewelry studios
• Jewelry and metalsmithing schools

Frequently Asked Questions

What is the throat depth of this saw?
The 124.008C is the 8" Mk.IV, providing the greatest throat depth among Knew Concepts' 3", 5", and 8" Mk.IV fret saw sizes.

How much blade tension is the Mk.IV designed for?
It is designed to pull approximately 50–60 pounds of blade tension.

Why choose the 8" model?
The primary advantage is reach. Its deeper throat allows the blade to travel farther into larger workpieces before the material contacts the back of the frame.

Is it good for piercing?
Yes. The cam-lever tension system is specifically designed for rapid, repetitive blade changes, making it particularly convenient for pierced and interior cuts.

Does this model have swivel blade clamps?
No. 124.008C is the fixed-clamp model. The corresponding 8" Mk.IV with swivel blade clamps is 124.008CS.

How much does the saw weigh?
Knew Concepts lists the 124.008C at 266.4 grams with the blade installed.

Does it include a blade?
Yes. Knew Concepts specifies that the saw comes loaded with a #7 Fix Blue premium fret saw blade.

What is the frame made from?
Knew Concepts specifies powder-coated aircraft-grade aluminum.

Is the 8" saw much heavier than the 5"?
Knew Concepts lists the 5" 124.005C at 214.3 g and this 8" 124.008C at 266.4 g, a difference of about 52 grams.

Where is the saw made?
The 124.008C is made in the USA.

Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.