Question for the engineers - screw within another screw head

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breacher · #1 Post by **breacher** » Sat Feb 10, 2018 7:58 am

I am sure I have seen this sort of thing somewhere but cannot find them now as I have no idea what these are called !

Basically a screw with a head which is drilled and tapped to accept a smaller screw.

What are these known as in the trade ?

I could just drill existing screw heads and use smaller self-tapping screws, I guess......but if available off the shelf it would save me time.

#2 Post by **ovenpaa** » Sat Feb 10, 2018 8:59 am

Reducers.

#3 Post by **Dellboy** » Sat Feb 10, 2018 9:01 am

similar idea to mirror screws ?

#4 Post by **Dellboy** » Sat Feb 10, 2018 9:02 am

https://www.diy.com/departments/avf-zin ... &rrec=true

#5 Post by **Lancs_Oakley** » Sat Feb 10, 2018 9:31 am

Mating screw or coupling screw is what I would call it.

#6 Post by **Dellboy** » Sat Feb 10, 2018 9:46 am

https://www.boltdepot.com/Threaded_inserts.aspx?nv=l

#7 Post by **ovenpaa** » Sat Feb 10, 2018 9:49 am

Is this for a carpentry application?

breacher · #8 Post by **breacher** » Sat Feb 10, 2018 10:21 am

Ovenpaa wrote:Is this for a carpentry application?

No - the big screw - self tapping into light plastic. The small screw - attaching very light metal item to big screw.

#9 Post by **20series** » Sat Feb 10, 2018 2:29 pm

I think you possibly mean helicoil

https://www.amazon.co.uk/s/?ie=UTF8&key ... kwuigim8_e

Or possibly these cavity fixings

https://www.screwfix.com/p/easyfix-self ... GwodMCoPBw

Alan

TomH · #10 Post by **TomH** » Sat Feb 10, 2018 2:32 pm

20series wrote:I think you possibly mean helicoil

https://www.amazon.co.uk/s/?ie=UTF8&key ... kwuigim8_e

Alan

No helicoils are for the repair of b*ggered screw threads.

The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

Question for the engineers - screw within another screw head

Question for the engineers - screw within another screw head

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