nylon gib strip grub screws?

Hi, I've been searching for where to buy this style of grub screw, they have a nylon 'pellet' in them, or at least that's the description of them I can find, does anyone know any other names these go by? I might be searching for the wrong name.

Try "self locking grub screws" to get started.

Some similar here - **LINK**

These used to be known as ‘Wedgelock’, now mostly replaced by ‘Loctite’ type threadlockers due to cost of manufacture, still useful for adjustment screws that need some resistance to vibration.

Also used to be a nylon inserted strip type call ‘Longlock’ these were more expensive still but held well over a longer thread length.

Peter,

They are also known as wedglok: **LINK**

https://www.fastenerdata.co.uk/thread-patch-pellet-tip

MichaelG.

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Waggonerman beat me to it.

Edited By Michael Gilligan on 15/01/2019 00:21:44

Thanks, that's the kind of thing I'm looking for, they only have one size though, and doing a google search, They seem to be the only place in the UK that sells them.

What size are you looking for, Peter ?

MichaelG.

Michael, I was looking for m6 x12mm specifically, but if I could find somewhere that sells these maybe some m5 too

I have seen a note somewhere where a chap made a diy version by drilling a hole through the screw and depending upon size of hole used some fishing line or whipper snipper cable as the plug.

A letter in one of the recent magazines ? Cannot remember.

Bill

Hi Peter,

Would wrapping a grubscrew in teflon tape give the same effect? You may need to roughen the thread surface by gripping it hard in a pair of pliers to stop the teflon slipping and experiment with the number of turns of tape but it should be possible to end up with a screw which is resistant to vibration turning.

Regards,

Alan

Hardened grub screws? Easy enough to drill if not, but still possible. Air Arms trigger adjusting screws are restrained by an acetal pip, which may be easier, than nylon, to machine.

Peter,

You might find a few hints in this previous thread:

**LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=99448&p=2

MichaelG.

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Specifically my link to this alternative with similar functionality:

https://nylok.com/products/nylok-blue-patch

Edited By Michael Gilligan on 15/01/2019 08:12:21

This idea was also presented on the Practical Machinist website and I can vouch for its efficacy. The screws are best drilled using a simple jig to hold them and align the drill. If "whipper snipper" is the same as strimmer then that is what I used!

How about drilling a short hole in the side of the screw and filling with hot glue, leaving the glue a little proud of the surface. Perhaps even just smear the glue over part of the thread without drilling at all.

Doug

You could approach this from a different angle - how about a drilled and tapped hole perpendicular to the axis of the grub screw, with a nylon screw in it? Of course you wouldn't want to do it on your heritage lathe, but might work OK in some situations.

Rob

EDIT: Sudden thought - cut a slot with a Dremel disc for a length of strimmer line

Edited By Rob Rimmer on 15/01/2019 18:57:29

For info. ... Nylok [or probably a clone] screws, as mentioned above, are so effective and so commonplace that IKEA is using them.

MichaelG.

I have heard of folk just putting a bit of nylon fishing line in the hole and then following with a plain grubscrew.

The idea is that the sideways pressure generates enough friction on the threads to prevent or at least discourage movement.

Trust me to come up with something cheap, quick and nasty!

Howard

Thanks to everyone who commented, I actually found somewhere that can order them in, so I'm going to get a price, they probably won't be cheap, this style grub screw was the standard one that came with my Mill, I've never seen them before, and I'm surprised they're not more common given it takes away the chance of losing the correct position when you tighten the locking nut, If they're too much I'm going to replace my Lathe with them too.

Ideas on how you could make them, I's use stainless, make maybe a 2mm hole all the way through, then use some thermo plastic (if you've never used this before, it's very tough like nylon) soften if up in boiling water as instructed, and just push a bit through the hole, I might try this regardless.

A sample pack of 10m of 1.75mm nylon 3D printer filament might do, or strimmer cord was mentioned - various diameters.

Yeah, there's a few things that might be worth trying, I just happened to have some of that thermo plastic, also as it re-hardens from its malleable state, it expands very slightly, so it might hold itself in the hole.

Having worked in the thread fastening industry for some years I'd go with Rob's 'cut a slot with a Dremel disc for a length of strimmer line'

H