Cutting rafters and purlins, rafter cuts at the ridge, solid timber and glued laminated timber up to 88 mm, insulation boards and soft fiberboard—and even sandwich panels on the hall roof: The K 85-18 brings deep cutting capacity for carpentry work to the cordless world without requiring a new battery system. Two 18-V PowerTanks from the CAS lineup deliver a combined 36 V—the same batteries already in use in KSS, DuoDübler, or Metabo tools; they are not compatible with Festool or Bosch.
The 60° swivel range is the key selling point for joinery: miter cuts that would end with a 45° cut can be made all the way through here—at 60°, there’s still 44 mm remaining. According to the operating instructions, sandwich panels up to 100 mm thick with a steel or aluminum outer layer are explicitly supported—but this comes with an important requirement: Metal shavings and foam dust must be thoroughly removed from the machine; otherwise, the protective hood’s function will be compromised. We’re letting you know this before the fine print does.
Buying the Mafell saw at RUWI isn’t something you should take for granted: 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’ll also tell you that this saw isn’t a purchase you should make just because it’s convenient.
Here's how to use it
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Cuts KVH and BSH up to 88 mm: the carpentry-grade saw without a cable reel.
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Make bevel cuts up to 60°: on the ridge where 45° saws give out—with a remaining depth of 44 mm.
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Separate sandwich panels: up to 100 mm with a metal facing—then clean thoroughly.
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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?
Let’s be honest: If you’re working with pieces under 67 mm, the K 65 18M is lighter —weighing just 4.4 kg—and more affordable; the 85 model, at 8.1 kg, weighs almost twice as much. For diameters over 88 mm, the K 105-18 takes over. And important for those new to the battery system: This model is only available as a PURE version without batteries, and it runs exclusively on two—if you don’t already have CAS batteries, be sure to add a Power Set to your order. The K 85 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: 88-mm-class cordless circular saw with dual battery, planks, laminated panels, bevel cuts up to 60°
Special Feature: Sandwich panels up to 100 mm (steel and aluminum outer layers 0.4 to 0.8 mm, PUR/PIR core) approved according to the operator’s manual
Battery system
Drive: 2 × 18 V DC, CAS dual battery pack – operates only with two batteries
System: CAS (Cordless Alliance System), batteries compatible with Metabo, Lamello, and Prebena
PURE version: without batteries and charger
Performance and cutting data
Speed: 2,800 to 5,200 min⁻¹, continuously via the adjustment wheel
Cutting depth at 0° / 30° / 45° / 60°: 88 / 75 / 61 / 44 mm
Cutting depth on the guide rail: up to 82 mm
Tilt range: 0 to 60°
Saw blade: Ø 237 × 30 mm
Riving knife: 2.0 mm, spring-loaded flip-out riving knife
Plunge depth preset: via stop bar for repeated plunge cuts
Scoring edge: moves with 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: 8.1 kg with batteries, without rip fence
Dimensions: 264 × 414 × 305 mm
Dust extraction
Connection: Ø 35 mm (internal)
System Partner: S 35 M Dust Extraction Unit
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)
