How to fix this screw?

HappyUser

Hello


The slot of this screw in this chair has damaged the turns and the screw pops out now and then.


How can I fix it its in position?


https://ibb.co/YcX2xMQ


Thanks!

MovingForwards

Some glue, screw it in, cover it / stick it in place with mole grips / peg etc and wait for it to harden.

Overtime the screw hole has probably widened and that's the cause of it undoing.

HappyUser

The problem is that forces of 100kg are exerted and I don't think glue will do.

unrecordings

In that case either a bigger screw to engage with the widened hole, or depending what's on the other side of the leg connecting it to the seat, replace the whole thing with a similar sized coach bolt (nut & bolt)

getmore4less

What's it screwed into I can't tell

Take out the screw take pic of that and the other side.
Even go as far as dismantle that side completely to do proper pictures of the assembly.

tonyh66

can you not replace it with a nut and bolt (with the same head obviously)

Norman_Castle

If the thread on the screw is visibly worn replacing just the screw might work. A small diy shop or market stall might be able to sell you an individual screw or a small car parts shop might help.

unrecordings

Norman_Castle wrote: »

If the thread on the screw is visibly worn replacing just the screw might work. A small diy shop or market stall might be able to sell you an individual screw or a small car parts shop might help.

To the OP, without further photos it's difficult to tell wether that's a self tapping screw or machine screw, M5 or M6, or whether the problem is some kind of connecting block under the seat rather than the screw itself.

In addition to Norman's suggestion, a local makerspace might be able to help you, but thinking on it I suspect from the design of the chair it's not the screw at issue

Mistral001

HappyUser wrote: »

The problem is that forces of 100kg are exerted and I don't think glue will do.

The glue presumably is only to stop the screw from turning. The turning force would be very small and a good glue should hold prevent the screw touring.

I would take the screw out and with a small hack saw deepen the slot for the screwdriver to tighten the nut sufficiently. However since the thin wall of the leg might prevent the screw from tightening fully as it will easily bend, glue might be required to keep the screw from turning. Often where a bolt goes through a tube, a spacer sleeve is put inside the tube to prevent the tube walls from bending so that the screws can be tightened securely but this can be expensive to fabricate and is often left out.

Jackmydad

Get another screw of the correct size.
If necessary, rethread, replace, or add a nut and washer to the female thread inside / underneath the seat, which is probably stripped.
If the screw thread is stripped then as already said you might just get away with a new screw.
Half measures don't work with chairs of any sort, they get too heavily loaded. Any repair has to be to restore the original, or make it better. So with all due respect to those who suggested it, personally I'd forget about glue as anything other than a very temporary answer.

Norman_Castle

Can you borrow one of the other screws to see if a different screw solves the problem?