100-series lumber in a single pass, cutting joists and purlins to length, ridge rafters with a 60° offset cut, on-roof insulation, and sandwich panels on the hall: The K 105-18 takes the cutting depth for timber framing away from the cable drum. 110 mm at 0°, 77 mm at 45°, and 55 mm at 60°—on the guide rail, it’s 104 mm. Two 18-V PowerTanks from the CAS inventory provide the power; they are not compatible with Festool or Bosch tools.
The Ø 280-mm blade with group-toothed design cuts through 100-mm cross-sections without wobbling, and the spring-loaded FLIPPKEIL prevents kickback. And here’s a fact we’re not hiding: 2.2 m/s² of vibration at the chipboard, compared to 0.7 for the K 85—the 280 series operates noticeably rougher.
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 only what we can recommend from our own experience—and we deliberately draw the line on our product range where our practical experience ends.
Here's how to use it
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100-series KVH and BSH without cable: 110 mm free, 104 mm guided—in a single pass.
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Cutting rafter ends: Mitered cuts up to 60° with a remaining depth of 55 mm.
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Separating insulation and sandwich panels: on the roof and in the warehouse, where there are no electrical outlets.
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Keep the following in the CAS inventory: two existing 18-V PowerTanks instead of a special system.
Does this fit in your workshop?
Here’s the honest question: If you rarely cut beyond 88 mm, the K 85-18 will be easier and quieter to use. Beyond that, you’re entering the realm of carpentry—the MKS line ranging from 130 to 185 mm, which we deliberately do not carry; the reasoning is explained on the page “What We Don’t Carry—and Why.” The same applies here: it’s available only as the PURE model, and the machine runs exclusively on two batteries—beginners should factor in a Power Set. The K 105 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 Applications
Design: Cordless circular saw for joinery work; 110 mm pushes the limits of what’s possible without a cord
Applications: 100-series BSH and KVH in a single pass, wood fiber insulation boards, sandwich panels
Battery system
Drive: 2 × 18 V DC, CAS dual battery, brushless motor – operates only with two batteries
System: CAS (Cordless Alliance System), batteries compatible with Metabo, Lamello, and Prebena
PURE version: without batteries or charger, in a box
Performance and cutting data
Speed: 2,800 to 5,200 min⁻¹, continuously on the adjustment wheel
Cutting depth at 0°, 30°, 45°, and 60°: 110 / 94 / 77 / 55 mm
Cutting depth on the guide rail: up to 104 mm
Swivel range: 0 to 60°
Saw blade: Ø 280 × 30 mm, cutting width 2.8 mm, body thickness 1.8 mm
Split wedge: 2.2 mm, spring-loaded flip wedge
Plunge depth preset: via stop bar
Scoring edge: follows the blade from 0 to 60°
Brake: electric, deceleration time approx. 2.5 s
Light: LED module with automatic shut-off
Dimensions and weight
Weight: 9.3 kg ready for use with two batteries, without parallel stop – the PURE version is shipped without batteries, so the shipping weight is correspondingly lower
Dimensions: 297 × 450 × 327 mm
Dust extraction
Connection: Ø 35 mm (internal)
System Partner: S 35 M Extraction Unit
Safety and Quality
Origin: Manufactured in Oberndorf am Neckar
Warranty: MAFELL-Complete, 36 months after registration
Spare Parts: 10 years from the end of production (Mafell commitment)
