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Draper M4 X 0.7 Pitch Re-threading Tool £1.20 Prime (£5.69 non Prime) @ Amazon
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Draper M4 X 0.7 Pitch Re-threading Tool £1.20 Prime (£5.69 non Prime) @ Amazon

22
Posted 18th AprEdited by:"_Stuart_"
Product Description Expert quality, for cleaning out and cutting damaged or malformed threads in conduit boxes and adaptable boxes only (4mm screws) and other similar jobs. Manufactured from high speed steel with precision ground threads and an impact resistant PVC handle.

Draper Expert tools are ideal for the professional tradesperson or the committed DIYer who appreciates quality. The range includes items for all of your professional and home improvement needs, including power tools, socket and spanner sets, saws and woodworking tools, storage items and protective gear, and engineering tools.

All Draper tools are manufactured to high quality standards that are strictly controlled by our quality control engineers. They offer good value for money and a number of useful features to improve the performance of the product. All Draper products come backed by the Draper Tools guarantee.

Draper Tools is a family-run company that has been selling high-quality tools in the United Kingdom and beyond for more than 90 years. To bring you the tool you need, the Draper buying team sources innovative products, which adhere to strict ethical and quality standards, from all around the world.

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1 x Draper m4 x 0.7 pitch re-threading tool
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22 Comments
This tool is for re-threading conduit boxes and adaptable boxes only (4mm screws).
For standard pattresses and dry lining boxes you should use the M3.5 x 0.6 Pitch version of this tool (3.5mm screws).

(At least according to one of the Amazon reviews!)
So a tap with a fixed handle? I suppose if you use the size regularly, it's convenient.
Bargain, ordered thanks!
As above m3.5 - 0.7 for electrical boxes these are for metal/plastic conduit boxes

m4 on electric boxes the screws fall through description is wrong
I can't see the point of this.
f the threads are damaged in electrical connections using this will probably mean you won't be able to tighten the screw up enough so the contact may overheat.
jasee18/04/2020 10:53

I can't see the point of this.f the threads are damaged in electrical …I can't see the point of this.f the threads are damaged in electrical connections using this will probably mean you won't be able to tighten the screw up enough so the contact may overheat.


But aint nobody got time for that, bodge invoice and onto next one
Just ordered. Thanks!
Yeah, 4mm is fairly specialist (conduit boxes). 3.5mm is the one to buy (standard mains backboxes etc). But heat from me, merely for the 'niche factor'. LOL . . . .
I have one it works great
Is this not a 4 specifically because rethreading a stripped 3.5 as 3.5 is going to strip out almost immediately? 4 gets into the remaining meat and leaves you with a much stronger connection.
jasee18/04/2020 10:53

I can't see the point of this.f the threads are damaged in electrical …I can't see the point of this.f the threads are damaged in electrical connections using this will probably mean you won't be able to tighten the screw up enough so the contact may overheat.


This tool has saved me a lot of hassle on numerous occasions when a back box doesn't accept the screw because the thread is no good. If you cant see the point I'm going to assume youre not in the trade.
What an idiot bought without looking at the description as my 3.5 got misplaced. anyway will become handy at this price.
jasee18/04/2020 10:53

I can't see the point of this.f the threads are damaged in electrical …I can't see the point of this.f the threads are damaged in electrical connections using this will probably mean you won't be able to tighten the screw up enough so the contact may overheat.



Whats going to overheat the back box ?
OliWarner18/04/2020 11:32

Is this not a 4 specifically because rethreading a stripped 3.5 as 3.5 is …Is this not a 4 specifically because rethreading a stripped 3.5 as 3.5 is going to strip out almost immediately? 4 gets into the remaining meat and leaves you with a much stronger connection.



Nope doesn't work like that.
Anyone ever seen a set of these with various sizes ?
007xico18/04/2020 13:06

Nope doesn't work like that.


I don't know what to tell you. It's exactly how it works here. M3.5-fine-tapped holes are drilled 3.15mm with 0.35mm pitch after tapping. 3.85mm across widest points. You scramble the thread, you end up with a 3.85mm hole. That's far too wide for tapping a sloppy-seconds M3.5.

M4x0.7 wants a 3.3mm hole but you'll still have enough meat to get some threads in there.
Edited by: "OliWarner" 18th Apr
OliWarner18/04/2020 16:32

I don't know what to tell you. It's exactly how it works here. …I don't know what to tell you. It's exactly how it works here. M3.5-fine-tapped holes are drilled 3.15mm with 0.35mm pitch after tapping. 3.85mm across widest points. You scramble the thread, you end up with a 3.85mm hole. That's far too wide for tapping a sloppy-seconds M3.5.M4x0.7 wants a 3.3mm hole but you'll still have enough meat to get some threads in there.



I am crap electrician but I only use it for one thing and that it try and repair a 3.5 screw hole.
Over the years the white accessories in the houses get taken off/on many times for EICR or to be replaced, normally the back box is the same as replacing a back box is a bit more involved.
So if the screw got screwed back at an angle,bent or rusted. We grab the 3.5 re thread tool and try slowly and carefully make another thread so we can use the 3.5 screw. Normally works and if not you screwed basically (there a couple of more option but not as easy) Is not and option to use a 4.0 re-threading tool as a m4 screw would look good on a white accessories.
007xico18/04/2020 16:47

I am crap electrician but I only use it for one thing and that it try and …I am crap electrician but I only use it for one thing and that it try and repair a 3.5 screw hole. Over the years the white accessories in the houses get taken off/on many times for EICR or to be replaced, normally the back box is the same as replacing a back box is a bit more involved. So if the screw got screwed back at an angle,bent or rusted. We grab the 3.5 re thread tool and try slowly and carefully make another thread so we can use the 3.5 screw. Normally works and if not you screwed basically (there a couple of more option but not as easy) Is not and option to use a 4.0 re-threading tool as a m4 screw would look good on a white accessories.


Yes, the 3.5mm re-threading tool is used exactly like that - for restoring a bruised thread in a metal back box or (with care) the threaded insert in a plastic pattress. You can get a 3.5mm tap quite cheaply (£2.31 upwards at Amazon as I write) and mount it in any convenient holder, or in the end of a short piece of dowel - cheaper than the 3.5 re-threading tools at typically £6 or more.

If the existing tapped hole in a metal box has been stripped too much, it can usually be restored by running in some solder (use a chunky iron - 65w or more) and then redrilling and using a 3.5mm re-threader or tap.

I've also used a 3.5mm tap to re-cut the thread in very old boxes with a 4BA thread (3.62mm o/d) to take the standard screws. Easier than cutting-out an old but still serviceable box!
Puffer18/04/2020 19:47

Yes, the 3.5mm re-threading tool is used exactly like that - for restoring …Yes, the 3.5mm re-threading tool is used exactly like that - for restoring a bruised thread in a metal back box or (with care) the threaded insert in a plastic pattress. You can get a 3.5mm tap quite cheaply (£2.31 upwards at Amazon as I write) and mount it in any convenient holder, or in the end of a short piece of dowel - cheaper than the 3.5 re-threading tools at typically £6 or more. If the existing tapped hole in a metal box has been stripped too much, it can usually be restored by running in some solder (use a chunky iron - 65w or more) and then redrilling and using a 3.5mm re-threader or tap. I've also used a 3.5mm tap to re-cut the thread in very old boxes with a 4BA thread (3.62mm o/d) to take the standard screws. Easier than cutting-out an old but still serviceable box!



Solder idea, I am stealing that and the 4BA never have them when they are needed
Thing is don’t do much domestic but do come across it sometimes.
Thanks for the clarification.
OliWarner18/04/2020 11:32

Is this not a 4 specifically because rethreading a stripped 3.5 as 3.5 is …Is this not a 4 specifically because rethreading a stripped 3.5 as 3.5 is going to strip out almost immediately? 4 gets into the remaining meat and leaves you with a much stronger connection.


But then you'll need 4mm screws - can you get them?
johnnyd57uk18/04/2020 14:51

Anyone ever seen a set of these with various sizes ?


Just get a tap/die kit. Depends on the "blunt" end, you can often use a screw driver handle designed for interchangeable bits. At these small sizes, anyway.
Robdaraff19/04/2020 08:55

Just get a tap/die kit. Depends on the "blunt" end, you can often use a …Just get a tap/die kit. Depends on the "blunt" end, you can often use a screw driver handle designed for interchangeable bits. At these small sizes, anyway.


Yep ive already got a set but they are quite large sized. Havnt seen anything on the smaller side for plugs ,sockets small casings etc.
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