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Tappet screws to secure downpipe brackets


johnny bravo

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installing downpipe  brackets onto van  interior roof  rail.    Im always getting wrong size.    any idea as to what size ill need.      after drilling pilot holes   Need to secure downpipe for 2 poles 

Thanks 

Edited by johnny bravo
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The pilot hole should be a little smaller than the root diameter of the self tapper. The root diameter is the solid shaft diameter not the outer with the thread.

As a very simple guide the pilot hole should be 1mm smaller than the self tapper outer diameter.

Have a search on google for self tapping pilot drill sizes and you will find some tables that also take in to consideration the thickness of the steel.

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51 minutes ago, johnny bravo said:

installing downpipe  brackets onto van  interior roof  rail.    Im always getting wrong size.    any idea as to what size ill need.      after drilling pilot holes   Need to secure downpipe for 2 poles 

Thanks 

I'm just fitting 2 down pipes in my van

20210110_154820.jpg

20210110_154944.jpg

20210110_155011.jpg

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Or use self drilling screws designed for metal stud walls - screwfix stock them. 
I’ve  used metal roofing sheet screws in the past with success.

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ill look on toolstation also  cheers

 

2 hours ago, Ian Docksey said:

I'm just fitting 2 down pipes in my van

20210110_154820.jpg

20210110_154944.jpg

20210110_155011.jpg

the downpipe fits in there , then tighten up

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41 minutes ago, johnny bravo said:

ill look on toolstation also  cheers

 

the downpipe fits in there , then tighten up

Yep, I think the lot ,10mm threaded rod,the brackets ,plates n screws n pipe came to about 20 quid.

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6 minutes ago, Ian Docksey said:

Yep, I think the lot ,10mm threaded rod,the brackets ,plates n screws n pipe came to about 20 quid.

10mm threaded rod, pack of 300mm long

Pack of 10 mm nuts

Pack of joining plates

2 off rubber interior brackets

2 lengths down pipe

1 box of self tappers.

Solid as a rock!!

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