Security screws/bolts on tee hinges

[Jupiter01]

I have brought some heavy duty tee hinges and was planning to use the dome headed coach bolts but notice that they all have that nut “thingy” which doesn’t slot through the round screw hole of the hinge. I’ve read about non-reversible screws but they don’t seem a popular choice.

Can I get some advice on this please. Thanks.

 

[Burnerman]

Most hinges have a square hole to accommodate the coach bolt but there's nothing to stop you filing the square off the bolt if you wish.
How about long roofing screws? Dome head, and with two nuts and a washer on the inside they will do the same thing.
John

 

[Jupiter01]

Most hinges have a square hole to accommodate the coach bolt but there's nothing to stop you filing the square off the bolt if you wish.
How about long roofing screws? Dome head, and with two nuts and a washer on the inside they will do the same thing.
John

All the screwfix and toolstation tee hinges don’t have the square holes.
Not sure which roofing screws you had in mind. Google throws this up for me and they’re all a security risk, given their heady types.

Look forward to your advice.

 

[Tigercubrider]

We used to have the old security screws at work, they worked, but were a pain if you wanted them out.
We also used a more modern type that was more like a sort of torx, but reversed.
The head was a raised bump, flat on the top. There were key ways on the dome’s sides.The tool was like a nut driver with matching key ways.
You could use stainless hex head coach screws and angle grind the corners off once installed.

 

[Jupiter01]

We used to have the old security screws at work, they worked, but were a pain if you wanted them out.
We also used a more modern type that was more like a sort of torx, but reversed.
The head was a raised bump, flat on the top. There were key ways on the dome’s sides.The tool was like a nut driver with matching key ways.
You could use stainless hex head coach screws and angle grind the corners off once installed.

Thanks for sharing. I prefer the coach bolts as they can be removed to shave the door, etc.

 

[simplesteve]

Ive always found it relatively easy to use a small square file to file the hole in the hinge to a square.

 

[scbk]

All the screwfix and toolstation tee hinges don’t have the square holes.
Not sure which roofing screws you had in mind. Google throws this up for me and they’re all a security risk, given their heady types.

Look forward to your advice.

Roofing bolts, as they have a nut (ideally 2 nuts or a nyloc) on the inside they won't unscrew

 

[Burnerman]

Roofing bolts - as seen in your pictures - double slotted heads, bright plated, various lengths, 6 or 8mm. Usually supplied with square nuts but the threads are conventional metric.
John

 

[Jupiter01]

Roofing bolts - as seen in your pictures - double slotted heads, bright plated, various lengths, 6 or 8mm. Usually supplied with square nuts but the threads are conventional metric.
John

Would these do, or do I need a straight screw driver head?

https://www.screwfix.com/p/easyfix-bright-zinc-plated-roofing-bolts-m8-x-100mm-10-pack/8786j

Also, it seems counter intuitive as to why they can't be undone from the outside and no are they advertised as that. I assume this is something you know from experience but intrigued to understand how it safeguards against this and a hex bolt doesn't. for instance.

Thanks for your help.

 

[Burnerman]

They will be just fine! A big broad bladed screwdriver to hold the head whilst you screw the nuts on.
Having a double locknut means that the whole screw will spin rather than undo.......so, push the screw through the hole, add a penny washer to spread the load and prevent too much digging in to the timber; add one nut and tighten up until well secure; add another nut to bite up onto the first one (use a spanner); then cut the remainder of the protruding thread off if you want.
John

 

[Jupiter01]

double locknut

Can I please check that this refers to using two square nuts as opposed to some particular type of nut?

add a penny washer

Does this get added between the bolt head and the tee hinge?

 

[Burnerman]

You can use the square nuts that come with the screw, or you can change them for ordinary metric nuts (cheap as chips from Screwfix).
The washer is added once the screw is passed through the timber.......you don't need anything on the hinge side - the screw head is big enough.
John

 

[Jupiter01]

you don't need anything on the hinge side

ah okay. On the back side then. Before I tighten the bolts. I can purchase the ordinary nuts if that is preferable.
Thanks again.

 

[Jupiter01]

You can use the square nuts that come with the screw, or you can change them for ordinary metric nuts (cheap as chips from Screwfix).
The washer is added once the screw is passed through the timber.......you don't need anything on the hinge side - the screw head is big enough.
John

Are these better than the ordinary metric nuts given my requirements?

Nylon Lock Nut

Zinc plated with nylon locking insert. 108 piece selection pack available (code 60090).

www.toolstation.com

 

[scbk]

Don't overthink it, you're just bolting the hinges on. I've got some with coach bolts, some with roofing bolts. You don't need to have bolts in all the screw holes. If somebody wants to break in they could cut the (heavy duty) hinges in seconds with a battery grinder, or cut through the wood