How to remove a rounded hex grub screw?

[devs]

Anyone know how I can remove this to replace? Many thanks!

 

[mattylad]

Drill it with a HSS bit and use a screw extractor

 

[KenGMac]

What is that "red" stuff in the hole?

Is that a small [almost] circular "hole" in the base of the old screw?

 

[devs]

Drill it with a HSS bit and use a screw extractor

Thanks, I did begin to drill it out but stopped as I didn't want to damage the internal thread. I do have some of these: https://www.screwfix.com/p/bolt-ext...QDx6yhT96xyt9y8mLZBoCADIQAvD_BwE&gclsrc=aw.ds

Shall I drill it out then use one of those? Just don't want to damage anything. Thanks

 

[devs]

What is that "red" stuff in the hole?

Is that a small [almost] circular "hole" in the base of the old screw?

The red is just staining. The grub has already been drilled some so appear circular on the photo rather than hex..

 

[JohnD]

if you drill it, use a left-handed drill, at low speed. The torque, heat and vibration will often loosen and wind out a damaged screw. Start with a small one, centred, and gradually increase.

drilling clockwise will only drive it in more firmly.

use a vice and a drill press, at the least.

please don't use a stud extractor unless you are skilled and/or have a tool to hold it steady. These extractors are very hard and brittle. Removing a snapped extractor is a lot more work than removing a burred screw.

You are very wise not to tell us the dimensions of the part, or what it is, because this prevents anyone giving you specific advice.

 

[KenGMac]

Or the nuclear option?

Drill out the remnants of the screw, then use a suitable sized repair solution, such as https://www.screwfix.com/p/helicoil-eco-thread-repair-kit-m8-x-1-25mm-14-pieces/403fr

I have very successfully used Helicoil products of differing dimensions, they do work.

Ken.

 

[thomp1983]

Probably a bit late now as you've tried drilling it but more often than not a torx bit hammered into the hex head will release them

 

[devs]

Many thanks for all the help guys. I managed to work it out! Happy man

 

[KenGMac]

OK no suspense, what did you do???

 

[devs]

Nothing too drastic.. Used the hex option above, wd'd, hammered in a slowly worked it out

 

[KenGMac]

AAA, do what works.

 

[devs]

Guys does anyone know what type of thread is on this? I purchased a replacement but it’s incorrect and I’m unsure of what it’s called and what to search for?

correct in right

 

[JohnD]

you are going to have to tell us the dimensions

and what it's off

what country it is from and when it was made.

Dimensions... very accurately.... in mm.

threads per inch if you can count them

 

[Munroast]

if you drill it, use a left-handed drill, at low speed. The torque, heat and vibration will often loosen and wind out a damaged screw. Start with a small one, centred, and gradually increase.
.

didn't know such things existed - thank you