Mushroom head screws

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Graham_Wright

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www.mastaclimba.com
Pondering covering the grp overlap on the bulkheads, I have produced some hardwood strips from free material milled to leave a small overlap on one edge using a spindle moulder.

I need to fix them to the bulkhead and some, at least, have to be removable as they support the headlining panels.

I am a fan of concealed fixings but, in this case, I am going for screws. Following the maxim, make a defect a feature, I am looking for mushroom head wood screws, stainless of course. So far, looking in vain.

Anyone help please?
 
Graham_Wright said:
Pondering covering the grp overlap on the bulkheads, I have produced some hardwood strips from free material milled to leave a small overlap on one edge using a spindle moulder.
I need to fix them to the bulkhead and some, at least, have to be removable as they support the headlining panels.
I am a fan of concealed fixings but, in this case, I am going for screws. Following the maxim, make a defect a feature, I am looking for mushroom head wood screws, stainless of course. So far, looking in vain.
Anyone help please?
Click to expand...
Mushroom head ........???

Pan head I suspect you mean If so I dont think Ive ever ordinary wood screws with pan heads. Roundheads or raised heads or countersunk

Self tapping screws come with pan heads and might do what you want. Otherwise use raised head screws in cup washers

stainless-a4%20self-tapping-screws-pan-slotted.gif
......... or .......
woodscrew_raised_slotted_stainless_steel_.gif
.......+.......
sscw.gif


A2A4 fixings and Seascrew are two places to look
 
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I really mean mushroom head!

The link from Stork_lll gives an idea. I have mushroom head machine screws but I am looking for wood screws slotted preferably.

The machine screws are M6 and have a head around 15mm in diameter, around 3mm high in the centre and tapering to almost a feather edge at the circumference.

I could make machine screws (but obvious don't need to!) but I don't fancy cutting a wood screw thread.

I will need a lot.
 
Have you considered Velcro? I've used it to secure all the internal wheelhouse panels. I use non adhesive and glue the strips with CT1. On wood surfaces I also staple them. Very strong fix. You'll need to plane down the panels to be fitted to ensure they sit flush with the others. A bit more work but a more professional finish.
 
I'm not sure velcro would be strong enough to support the panels especially with vibration present.
The strip are 80mm wide, 12 mm thick and with one rounded corner. They are offcuts from a customer.

The spindle moulder reduces the thickness down to 6mm save at the rounded corner leaving a for of extreme J profile. The corner remaining covers the edge of the glassing which sits in the recess. (What do they say about a thousand words?). Done it! The shaded portion is that which is removed.IMG_0817.jpg
 
For removable panels I have used the domed counter self tappers with a cup washer like the second one Vic posted.

I have also used magnets and steel strips to hold cover panels in place.

I have also used velcro but found the self adhesive type useless as the the adhesive comes unstuck in our heat so a mechanical fixing is needed.
 
The fixings on my boat are covered with plastic buttons, white or brown, according to site. They look neat and unobtrusive but I don't know what they are called.
 
johnalison said:
The fixings on my boat are covered with plastic buttons, white or brown, according to site. They look neat and unobtrusive but I don't know what they are called.
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How are they attached to the screws? That sounds a possibility. I could make such buttons. There are mirror fixing screws that have screw-on heads which are approaching the right shape although it is more of a dome than a mushroom.
 
Graham_Wright said:
How are they attached to the screws? That sounds a possibility. I could make such buttons. There are mirror fixing screws that have screw-on heads which are approaching the right shape although it is more of a dome than a mushroom.
Click to expand...
My boat has something like that. The covers are in two parts - one goes under the screw head and the other clips onto it and therefore over the head. They look quite neat but I have never managed to get one off in good condition - the plastic is soft and distorts - so I think they need replaced every time.

I think they may be called "screw caps": Screw Cover Caps - Plastic Screw Heads - White: Amazon.co.uk: DIY & Tools. There are also some which attach to a posidriv hole direct.
 
Ive used this type of screwcap, ( They come in a few other colours) They look neat and in keeping with vinyl covered trim but I would not use them on wooden trim
 

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Graham_Wright said:
I'm not sure velcro would be strong enough to support the panels especially with vibration present. ...
Click to expand...

If there is space for something a little thicker than Velcro, 3M Dual-Lock patches/strips will hold very strongly indeed. So much so that you might well have to use epoxy instead of their own built-in adhesive, as I did on headlining panels - and largely avoided all the capped screws previously employed, except at points of very high curvature.
 
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