Plastic for Threading.

[Arnak]

Hi Folks,

Could I have some advice please on what would be the best plastic to use for a threaded hole?

One that would give good self lubrication and make a tight fit.

Alternatives would be a big help.

Thanks,

Martin

 

[Woodster]

Depends on the application, but Delrin (Polyacetal) is a pretty safe choice. It machines well, with very little tearing/hairs, and is pretty hard as plastics go. If you need a tight thread with low friction, use Teflon (PTFE), but it's quite soft, deforms easily, and can be tricky to get a decent surface finish on. Avoid Nylon, Polypropylene and PVC. Peek is nice, machines nice but is expensive.

 

[goldstar31]

Toilet seats? Has one ever had a look rather than the other functions.

I have 6- scattered around the civilised world.

ALL have plastic nuts and bolts.


Are you missing the obvious?

Norman

 

[Arnak]

Hi Guys,

Thanks very much for the replies.

It sounds as if Delrin would be good for what I need, I'll go for that.

Toilet seats???

Sorry but I don't get the reference.

Martin

 

[goldstar31]

[QUOTE=Arnak;259687Toilet seats???

Sorry but I don't get the reference.

Martin[/Q

:fan:Oh Dear, Oh Dear:hDe:

When I replaced the holding down bolts on the seat, they were plastic.

Maybe your thoughts have been elsewhere:wall:

 

[Arnak]

Hi Goldstar,

No my thoughts were not elsewhere.

I know they are plastic but I wanted to know which plastic was best for a threaded hole.

I didn't know which plastic to use in Loo of another material.

Regards,

Martin

 

[goldstar31]

Hi Goldstar,

I know they are plastic but I wanted to know which plastic was best for a threaded hole.

I didn't know which plastic to use in Loo of another material.

Regards,

Martin

Martin
It's a huge subject and I have no doubt that the other main use is is in the automobile industry. There are literally thousands of fasteners holding all sorts of bits.

I hate all this throwing away of potentially usable trash( rubbish) and get annoyed to see how much that I have spent indirectly and had to dump.

So one answer to your question is to try to identify the recycling symbol on all sorts of things so that they might be reused for all sorts of things-including nuts and bolts.

I've just shredded a million Christmas cards and found a plastic tray from some quick food joint and wondered if a use could be found.

If you think of it, many gears are made from cloth or paper bonded with a phenolic resin.

Meantime, my regards

Norman

 

[Arnak]

Hi Norman,

I agree, there is so much waste these days that really should be put to a good use.

Good point about the markings on plastic I hadn't thought of that.

Martin