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9-Apr-2011 9:38:44 AM
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Hello knowledgeable chockstone users.
Does anyone know what material the spring in your standard aluminium screw gate carabiner is made out of?
I need to know if there are any ferrous metallic components in an aluminium biner.
Cheers
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9-Apr-2011 9:55:22 AM
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If their made in China eg. "Chetzyl" it's anybody's guess.
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9-Apr-2011 10:15:33 AM
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On 9/04/2011 salty crag wrote:
>If their made in China eg. "Chetzyl" it's anybody's guess.
>
I'm more talking the main manufacturer's petzl, BD, DMM etc.
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9-Apr-2011 3:13:12 PM
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some biners have stainless gate pins and some have ferritic pins. Some springs are ferritic. Most wiregates seem to be stainless. You can check with a magnet (ferritic will attract a magnet)
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9-Apr-2011 4:44:33 PM
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On 9/04/2011 mikllaw wrote:
>some biners have stainless gate pins and some have ferritic pins. Some
>springs are ferritic. Most wiregates seem to be stainless. You can check
>with a magnet (ferritic will attract a magnet)
Yeah thats why I want to know if they are ferritic. I'm building a rig to go in a MRI machine and I was thinking of attaching a biner to the rig. So I need to be sure that it will not be affected by the powerful magnet in the MRI.
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9-Apr-2011 5:19:57 PM
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DMM seem to have plastic ones
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9-Apr-2011 8:48:47 PM
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On 9/04/2011 vonClimb wrote:
>Yeah thats why I want to know if they are ferritic.
* magnet
I'm building a rig
>to go in a MRI machine and I was thinking of attaching a biner to the rig.
>So I need to be sure that it will not be affected by the powerful magnet
>in the MRI.
I believe even stainless can be an issue in those sorts of fields.
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10-Apr-2011 5:12:01 PM
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Mostl they are stainless as are the pins but this doesn´t help much as the usual spring grades are magnetic, apart from a few very specialised alloys stainless steels all become magnetic from the heat treatment or from cold working.
Jim
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10-Apr-2011 5:15:24 PM
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There is a company which makes plastic mallions, I saw one a few years ago, rated to 80kg breaking strength. not sure who makes them.
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