Square head bolt - correct term

[farmer]

Hi lads, could anyone tell me the correct term for this type of bolt please?
I'm fairly sure it starts with the letter "B".

Farmer

 

[Leesparkykent]

Carriage bolt

 

[Pete999]

View attachment 44247
Hi lads, could anyone tell me the correct term for this type of bolt please?
I'm fairly sure it starts with the letter "B".

Farmer

Roofing Bolt

 

[Wilko]

AKA coach head bolt

 

[telectrix]

up north we call them coach bolts. carriages are for rich southern plebs..

 

[Andy78]

Aye, coach bolts.

 

[westward10]

Carriage bolt as a coach bolt is more like a wood screw which carves it's own thread.

 

[farmer]

Carriage bolt

AKA coach head bolt

Google agrees with both of you lads but it was a different term I was told. It was only today that I was told too!

Thanks

Roofing Bolt

I would've called this a roofing/gutter bolt even though I've never seen one on a roof ??
Thanks

 

[Andy78]

Carriage bolt as a coach bolt is more like a wood screw which carves it's own thread.

That's a coach screw surely ?

 

[westward10]

That's a coach screw surely ?

Mmm, seems like the OP has started something.

 

[Risteard]

I vote for coach bolt also.

 

[Rpa07]

Isn’t a coach a motorised carriage - I’ll go for carriage bolt. What do we win?
@egg67 will be on in a minute with the answer ‘A1’ - ignore him ok?

 

[Strima]

Coach bolt. Coach screws have hex heads and cuts their own way through wood.

 

[Rpa07]

Apparently they’re all the same so the universe is keeping us from sleep all for this twisted riddle - I’m not falling for it any longer!
Night night carriage bolt users!

 

[Baddegg]

It’s a coach bolt,when you join 2 pieces of timber with a dog tooth washer in the middle of the timbers and a square plate washer with nut on the other end the square lug pulls into the timber and prevents the bolt from turning........or so I heard anyway

 

[egg67]

It’s a Thingamajig that goes in the dose amflip, Otherwise known as the first letter of the Alphabet plus 1

 

[PEG]

Coach or carriage bolt,is correct,together with many other local and foreign terminology,some hailing from the transport job,some the building job,and extra terminology we took up,during input from overseas suppliers,such as during and just after WW2.

A coach set screw,is threaded the entire length,a coach bolt,has a plain shank,and is threaded for a percentage of it's end,10-25%.

Timber fixings,may still be described as either bolt or screw,but with a parallel or tapered wood type thread,will have a means of driving,such as a square,hex or internal driving form.

Gutter bolts are of small diameter,and have a slot or cross-slot,usually to hold the bolt,whilst tightening was achieved on the square nut.

I have an extensive library of engineering books,including standardised thread form history,and a series of Buck and Hickman catalogues,in mostly hardback,from the 1800'S to mid 70's.

So,anyway....that's what i spent me time do'in...whilst the rest of you were testing beer and honing chat-up lines...

 

[Deleted member 26818]

Square shank set screw.

 

[LeeH]

‘Screws ‘normally have threads the full length. So a hex head bolt with full threads is actually a SET SCREW. Normally called ‘hex set’

If it has a shank (non threaded part) it’s a BOLT

That’s how I was told in my first job in a engineering stores.

It may or may not help to solve this riddle!

 

[Deleted member 26818]

Hmm.
Coach bolts (which is what I would call them),
Carriage bolts,
Cup head bolts,
Mushroom head bolts.

Tapered bolts that you screw into wood, are called lag bolts, lag screws or coach screws.

 

[PEG]

I just had a peep at a listing from Nettlefolds,who were one of our longest standing engineering manufacturers of fixings.

Although looking identical,they list "Carriage Bolts" and "Cup Square Bolts" as different items.

Carriage Bolts,are listed up to 7/16" diameter and 16" long,and have no B.S.S number.

Cup Square Bolts,are listed up to 1 1/2" diameter and 12" long (additional lengths on request) and have a B.S.S number for both bolts and nuts,that is,an engineering specification in terms of strength and conformity,for use in engineering applications.

Anybody who has any questions regarding their selection of moulders brads,clyde dog eared steel brobs,or wrought iron holdfasts...just send me a telegram

(I have the telegraph and cable order code documents,which are fascinating...£40 in 1886,was coded "ketchup" seems a long way from Skyping me pal in New Zealand,on an S9...)

 

[Edtwozeronine]

I thought they were called M6 roofing bolts.

 

[Intoelectrics]

I thought they were called M6 roofing bolts.

Usually roofing bolts don't have a square shank, but rather have slots on the dome head so a tool can be used to stop them turning rather than relying on the square shank pulling into the timber. This said I have heard, the terms coach, carriage, roofing, dome head... for all sorts of similar bolts and screws.
I guess its probably down to what ever is the most common traditional term local to your area.

 

[farmer]

Boulon is the name I was told which is the French for bolt! I spose it's a colloquial term

 

[telectrix]

here you go. square heads. :

 

[ruston]

here you go. square heads. :

So are the bolts Bosch?

 

[telectrix]

vorsprung durch tecknik

 

[ruston]

Audi spell coach bolt then ?

 

[telectrix]

Audi can't even spell Howdy.

 

[ruston]

That's why we Northerners call them coach bolts . We cant spell that long word.