Strength of Thread

[Ashley Burton]

Had a situation at the weekend on some studding where the threads were stripping under tension

Would I be right in saying a higher thread pitch can take more load/torque under tension?

Also the quality of the steel needs to be of a higher tensile strength?

Welded a couple of nuts together in the end which worked, But it did make me question physics

 

[123hotchef]

yes 8.8 10.9 12.8 are main grades also nuts aint just nuts they are graded too

 

[Arclikeharrypotter]

A Finer thread is ‘stronger’ than a coarser thread of the same diameter.

 

[ronan]

A Finer thread is ‘stronger’ than a coarser thread of the same diameter.

I thought that too, but it is only in certain circumstances that finer threads are stronger. Also the material being threaded. For instance coarse threads are much stronger in soft material like aluminum. Things like cylinder head studs are coarse if they are going into aluminium.

 

[Rig Pig]

Studding is often Chineseium.

 

[Ashley Burton]

Studding is often Chineseium.

Yeah I definitely found that out on a Sunday afternoon when I took a visit to Toolstation.

 

[WorkshopChris]

Yeah I definitely found that out on a Sunday afternoon when I took a visit to Toolstation.

Some of the TS stock is shocking in particular 8mm have you looked a high tensile https://www.cromwell.co.uk/shop/fas...ile-metric-steel-grade-8-8-din-976-1a/f/70649

 

[Ashley Burton]

Some of the TS stock is shocking in particular 8mm have you looked a high tensile https://www.cromwell.co.uk/shop/fas...ile-metric-steel-grade-8-8-din-976-1a/f/70649

It was the best option I had available at the time unfortunately. But would of paid more for a better quality product.

 

[knighty]

what size was it, and was it stripping while you tighten it or once tight and put under extra tension?

takes a fair bit of force to strip threads of a static nut/bolt

 

[piman]

Hello Ashley,

what can also help are the extra long nuts sold to join two lengths of studding together. Spreads the load.

Alec

 

[Ashley Burton]

what size was it, and was it stripping while you tighten it or once tight and put under extra tension?

takes a fair bit of force to strip threads of a static nut/bolt

M10, It was stripping threads once tight & under tension

 

[Ashley Burton]

Hello Ashley,

what can also help are the extra long nuts sold to join two lengths of studding together. Spreads the load.

Alec

Yeah would of saved me welding some nuts together. But I hadn't used the welder in a while + this is a welding forum

 

[brightspark]

you haven't said what the loading is and being used for. steel will be mild rod or high tensile steel depending on its application

 

[Ashley Burton]

you haven't said what the loading is and being used for. steel will be mild rod or high tensile steel depending on its application

I was only pulling a gearbox onto an engine

 

[brightspark]

I was only pulling a gearbox onto an engine

that really narrows it down

 

[Ashley Burton]

that really narrows it down

If I was using better quality threaded rod I probably wouldn't of had an issue. But as you might of seen from my garage floor picture in the welding cart thread it wasn't a small gearbox. I didn't want to damage the clutch splines or gearbox shaft. So thought the better option was to pull rather than push

 

[ronan]

I was only pulling a gearbox onto an engine

I used ordinary studding in a makeshift pullers a while ago and it was useless, the steel studding was like toffee, waste of time.

 

[eLuSiVeMiTe]

Yeah I definitely found that out on a Sunday afternoon when I took a visit to Toolstation.

There's your issue. Pop to cromwells or somewhere like and get some high tensile and decent nuts.

 

[Ashley Burton]

There's your issue. Pop to cromwells or somewhere like and get some high tensile and decent nuts.

Only option I had available on a Sunday + If they were open the nearest is Northampton. But never mind!

 

[eLuSiVeMiTe]

Only option I had available on a Sunday + If they were open the nearest is Northampton. But never mind!

Know the feeling. learnt my lesson these days and prepare in advance or wait till I can get what's needed.