Latest News: Forums Technical Screwing into a mast or boom

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  • #4153
    wayfarer5560
    Member

    Hi could any one help me on what type of screws to use if i needed to screw into my mast or boom , unfortunatly i do not have a rivet gun and was wondering if i could use screws instead ❓

    #9192
    Algol
    Member

    Self tappers, preferably stainless

    #9193
    wayfarer5560
    Member

    Thanks algol , is there a prefered length and should the pilot hole be quite small or just small enough ?

    #9194
    Algol
    Member

    They come in all sorts of diameters and lengths and head types. See here, for eg: http://www.tridentuk.com/sailing/Self_Tappers.html

    Which you select depends on the thing you want to screw down, but on the mast or boom you wouldn’t want to use something that’d protrude very far inside because of the risk of fouling some control lines.

    #9195
    Algol
    Member

    @wayfarer5560 wrote:

    should the pilot hole be quite small or just small enough ?

    You should drill out enough so that it’s only the sharp thread that cuts into the alloy you want to screw into. A bit of trial and error with a set of drill bits is the best way to do it

    #9197
    Swiebertje
    Participant

    @Algol wrote:

    @wayfarer5560 wrote:

    should the pilot hole be quite small or just small enough ?

    You should drill out enough so that it’s only the sharp thread that cuts into the alloy you want to screw into. A bit of trial and error with a set of drill bits is the best way to do it

    No, a bit of measuring works much it better. With a caliper it is easy to measure the thickness of the screw’s core but you can also eyeball it on a tape measure. Drill a hole equal to the screws core diameter. After test fitting and cutting thread in the mast, remove it and grind the sharp point from the screw, it will “bite” your halyards otherwise. And for that same reason it is IMHO better to use pop rivets instead.

    If loads are low Aluminium pop rivets are best for they do not create galvanic problems with an Aluminium mast. If you use Monel or Stainless Steel rivets, screws or even SS parts, you need a little Duralac between the steel and Aluminium to prevent Electrolysis, specially if you sail on saline water.

    #9198
    wayfarer5560
    Member

    Thanks guys that has helped alot , the only problem is i dont think i could rivet a clam cleat on the side of the boom , therefore screws would probably work better . Once this is done the outhaul will be complete and the boat nearly ready for the water 😆

    #9199
    Swiebertje
    Participant

    Outhaul cleat on the mast? I hope you made an honest mistake, the outhaul sits in the boom and an outhaul cleat is usually fixed to the boom. The purple line in the picture is my outhaul.
    [img]outhaul.jpg[/img]

    #9204
    wayfarer5560
    Member

    Yeah sorry about that I am going to put the outhaul arrangement that has been discussed in another topic .

    #9212
    BluTak
    Participant

    Agreed rivets are a lot better but for pilot hole google – pilot hole self tapper -Robert

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