Cut slats, framing lumber, and KVH to length; make miter cuts for formwork and siding, countertops, and doors—with consistent accuracy, without the hassle of marking. The crosscut guide rests against the workpiece; the stops on the underside of the guide allow angles from −60° to +60°; the saw makes the cut and then automatically retracts to its starting position—ready for the next one.
And when you don’t need to make crosscuts: The push of a button disconnects the machine from the guide rail, leaving you with a full-featured cordless circular saw with a 58 mm cutting depth—the same machine as the K 55 18M bl, featuring the FLIPPKEIL, plunge cutting, and F-rail compatibility. The miter rail provides 52 mm of cutting depth, and the system weighs 5.7 kg. The battery is CAS: compatible with Mafell, Metabo, Lamello, and Prebena; not compatible with Festool or Bosch.
The fact that you’re buying the Mafell saw at RUWI isn’t a given: We’re manufacturers ourselves—tools for woodworking professionals from Fluorn-Winzeln, 4 kilometers from the Mafell factory in Oberndorf am Neckar. We carry products that we can recommend based on our own experience—and when it comes to the classic question, “40, 50, or 60?” we’d rather give you an honest answer than a convenient one.
Here's how to use it
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Cutting KVH and framing lumber: up to 52 mm on a horizontal workpiece—the automatic retraction system pulls the saw back.
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Set miter angles: −60° to +60°, with repeatable accuracy at the stop.
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A circular saw at the push of a button: 58 mm free or on the F-rail—cut panels without having to reconfigure the machine.
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Work cordless: 18-V CAS battery—on roofs, scaffolding, and construction sites.
Does this fit in your workshop?
If 90% of your work involves cutting flooring, panels, and sheets and you want to save weight, the KSS 40 18M bl is 3.6 kg lighter. If you need more than 52 mm on the rail or want to share blades with the K 65, go for the KSS 60 18M bl —in the community, the jump from 50 to 60 is considered the more worthwhile one. The KSS 50 is the right choice if your material is up to 52 mm thick and you’re using the 168-mm-diameter blade set together with the K 55. The KSS 50 cc is the same saw but with a power cord.
You can read about why your vacuum should be Dust Class M in the knowledge article on wood dust extraction —and the Machine Advisor will help you find the right saw by asking you two or three questions.
All the details
Function and Application
Design: Cordless crosscut rail saw, crosscut and miter work on horizontal workpieces, with automatic retraction
Dual-purpose: Released from the crosscut rail at the push of a button, it functions as a full-fledged handheld circular saw (cutting specifications of the K 55)
Battery system
Drive: 18 V DC, brushless
System: CAS (Cordless Alliance System), batteries compatible with Metabo, Lamello, and Prebena
Included in the set: 2 × PowerTank 18 M 99 LiHD and APS M Cordless PowerStation
Performance and Cutting Specifications
Speed: 2,450 to 5,450 rpm, 6 settings on the adjustment wheel, constant-speed control
Cutting depth at 0° / 30° / 45°: on the miter rail 52 / 50 / 42 mm, free-cutting 58 / 56 / 48 mm
Cutting length: 470 / 400 mm (for workpiece thicknesses of 12 / 49.5 mm)
Mitre angle on the rail: −60° to +60°
Saw blade: Ø 168 × 20 mm
Split wedge: 1.2 mm, flip-wedge function
Brake: electric, deceleration time approx. 1 to 2 s
Light: LED module, turns on when in motion and off when stationary
Dimensions and weight
Weight: 5.7 kg with guide device and battery; machine alone 4.3 kg
Dimensions with guide device: 257 × 751 × 258 mm
Guide and system
Cutting rail: System component with fixed and adjustable angle stop, automatic retraction
Blade assembly: Ø 168 × 20 mm, compatible with the K 55; existing accessories for corded machines fit
Dust extraction
Connection: Ø 35 mm (internal)
System partner: S 35 M dust extractor
Safety and quality
Origin: Manufactured in Oberndorf am Neckar
Warranty: MAFELL-Complete, 36 months after registration
Spare parts: 10 years from end of production (Mafell commitment)
