15mm is a fairly conservative value - its mainly if you go thicker than that you risk bending the swinging hammer blades, or jam it and burn out the belt.

They are hardened steel but have seen a couple snapped

Entire Thread
Subject	Posted By	Posted
Masport 5 hp B and S Chipper Shredder	MowingManiac	27/10/23 04:10 AM
Re: Masport 5 hp B and S Chipper Shredder	Bruce	27/10/23 01:41 PM
Re: Masport 5 hp B and S Chipper Shredder	MowingManiac	27/10/23 10:20 PM
Re: Masport 5 hp B and S Chipper Shredder	MowingManiac	29/10/23 10:53 PM
Re: Masport 5 hp B and S Chipper Shredder	Mowerfreak	30/10/23 01:51 AM
Re: Masport 5 hp B and S Chipper Shredder	Tyler	30/10/23 03:43 PM
Re: Masport 5 hp B and S Chipper Shredder	MowingManiac	30/10/23 11:40 PM

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