Lift the Dot fasteners

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Graham_Wright

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Location
Gloucestershire
www.mastaclimba.com
I have used these on my spray hood but the studs are way too short for GRP. In view of the probable forces, I would like a washer under the head and sufficient length to accept a washer and a full nut on the underside of 8mm thick grp.

Does anyone know of a source of such a beast? There are available "extra length" studs but the description refers to the stud projection length not the threaded length.

In desperation, I am about to make some but the machines are a bit busy at present.
 
Graham_Wright said:
I have used these on my spray hood but the studs are way too short for GRP. In view of the probable forces, I would like a washer under the head and sufficient length to accept a washer and a full nut on the underside of 8mm thick grp.

Does anyone know of a source of such a beast? There are available "extra length" studs but the description refers to the stud projection length not the threaded length.

In desperation, I am about to make some but the machines are a bit busy at present.
Click to expand...

I made a plate that had tapped holes for the lift the dot and countersunk holes for fixing screws that went through the strip and the cabin side.
 
Graham_Wright said:
Wow! Nice to hear someone else goes over the top!

Doesn't the plate do the job of a nut (or is it down to inaccessibility?).
Click to expand...

In fact it was due to the fact that I got nume from the US so came with a small unified thread and could not get nuts for them local but could bet a tap.

I am glad I did it that way as when my spray hood shrunk I could move the bar and only reposition 3 holes and not all the lift the dots.
 
You can get lift the dot studs that have a small plate across the bottom of the stud and two holes for countersunk self tappers. Available here https://www.profabrics.co.uk/collections/lift-the-dot-marine at £2.07 plus vat per stud.
That said, I’ve only ever used the standard single threaded stud and never had a problem with them. The only one I’ve had come out of the grp was due to it being stepped on....
 
Graham_Wright said:
I have used these on my spray hood but the studs are way too short for GRP. In view of the probable forces, I would like a washer under the head and sufficient length to accept a washer and a full nut on the underside of 8mm thick grp.

Does anyone know of a source of such a beast? There are available "extra length" studs but the description refers to the stud projection length not the threaded length.

In desperation, I am about to make some but the machines are a bit busy at present.
Click to expand...
As Duncan said go for the type that takes 2 countersunk self tappers. If you really want to be secure you could use long countersunk bolts with nuts on the underside.
 
Graham_Wright said:
I have used these on my spray hood but the studs are way too short for GRP. In view of the probable forces, I would like a washer under the head and sufficient length to accept a washer and a full nut on the underside of 8mm thick grp.

Does anyone know of a source of such a beast? There are available "extra length" studs but the description refers to the stud projection length not the threaded length.

In desperation, I am about to make some but the machines are a bit busy at present.
Click to expand...

I used the studs with 10mm M5 studs in 8mm grp 4 years ago and no signs at all of them failing. I drilled and tapped the grp to M5, a smear of araldite on the thread and screw them in. My studs were into a blind cavity so no opportunity to fit a nut to the underside.

Www.solocoastalsailing.co.uk
 
Is there a better alternative to lift the dot fasteners? Last year we had the spray hood down & i knelt on one of the sodding spikes near the edge of the cabin top, it went in under my kneecap right to the hilt. Claret all over the deck & could barely walk for days. I have taken them all out & epoxied the holes up. I hate the things.
 
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