how to unscrew a threaded screw

Generic way is to drill smaller hole and use screw extractor.

Serg

Drill a hole in the broken shank about 2/3 the diameter of the shank.

Make a 4 sided tapered and pointed drift by filing a nail into such a shape (easier to draw than describe).

Gently tap the drift (nail) into the hole in the shank until it gets a good purchase.

Use mole grips or similar to rotate the drift and, hopefully, the shank from the housing.

A little lubricant (3 in 1 oil?) applied to the threads first may help.

Mike Harding

Tony,

Mike's suggestion is bang on the money. Pop into the factory, I've got the gear.

If needed we can always run a tap through the hole and fit a larger screw.

Jim.

You could try a "Grabit Damaged Screw Removal Tool". These are available from Bunnings or Jaycar Electronics. CAT. NO. TD2059 from Jaycar Electronics

Paul

Another way is to use a cutting disc on a dremel or die grinder to cut a slot in the head and then use a screwdriver to extract it.

If it's a Philips head screw, dip the screwdriver in valve grinding paste.

Has this screw got an exposed domed head on it, can you post a photo as I might be able to tell you a easy way to get it out.

Regards Richard

theres lots of ways to extract a siezed fsatener. After 26 years in the engineering trade I've found the #1 tool for this job is Wurth Rost Off. Its the best penetrating oil bar none. Spray on and let penetratefor a while, then, as someone suggested, cut a slot in the head (if its a hex head) and work it back & forth a bit at a time with a lagre'ish screw driver. Dont try to force it. If its a cap head you can grind an old good quality allen key to fit the rounded out hex. Be sure to not temper it back while grinding it.

I've removed 1000's of siezed screws over the years and each one is unique and difficult (and frustrating). Another way is to progressively drill it out to the tapping drill size so you are left with the threads. Then they can be picked out with a sciber or an O ring pick. You need to be smack on centre with the first drill though. One thing I learned is patience and persistence.

If that dont work, a big hammer or oxy. lol

good luck with it. Hope something works for you.

Tonester,

If your sensor has a flange with the screw though it , you could just drill the head off , remove the sensor , grab hold of the shank of the screw with long nose mole/vice grips and wind it out.

This is a very easy solution if that how its set up.

Hope this helps you out ,

Glenn.

You said the nut is mangled. Presumably the thread has siezed, so you need to lubricate it with a penetrating oil before doing too much grunting. S'pose there are a few around, but Penetrine has always been my standard. If you have the time, a few drops on it over a full day or even a few days. Then try vice grips, or similar. Have a new spare part handy to replace the buggered one. If the original nut head breaks off, then you need an Easy-out, which requires you to drill a hole down the centre of the screw, then tap the Easy-out into the hole. Pricnciple is, the Easy-out screws in on a reverse thread and when it bites it turns the screw in the right direction to remove it. But, it's always better to persevere and try and to get it out with its' original nut.