Thread Fatigue?

[a64pilot]

I’m not abdicating it, don’t really see the need, just don’t think it’s the end of the world is all.
For someone like me who is likely to never adjust their own rigging, it may not even be all that bad an idea.
Mine are supposed to have tefgel in the threads, but to look at them, they look dry to me

[charliehows]

Loctite on turnbuckles??! good luck with that. Lanolin swathed generously on mine at fitting, locknuts applied.
On the subject of thread fatigue – I spent years blueprinting harley engines, one of my pet peeves was factory bolts never use the full depth of thread in case fittings – I chugged along for hours measuring depths and cutting/filing longer replacement bolts – a bolt using half the available thread depth will likely strip either bolt or case but one using the full available depth almost never fails.

[a64pilot]

When we built Dragbikes years ago, we drilled out the cases and helicoiled them. The additional surface area of the helicoil added enormous strength. Used stock bolts as the failure mode was the steel bolts pulled out the aluminum threads, always.

[charliehows]

Originally Posted by a64pilot

When we built Dragbikes years ago, we drilled out the cases and helicoiled them. The additional surface area of the helicoil added enormous strength. Used stock bolts as the failure mode was the steel bolts pulled out the aluminum threads, always.

filing that one under 'you learn something every day' - I only ever thought of helicoils as a last resort repair and have used them so rarely i still have a near complete box set i bought 25 years ago. Thanks.
back to OP question; Ive replaced most of my rigging turnbuckles with s/s bottlescrews for that reason - the bottle screw can use the full thread as it tightens whereas turnbuckles only use the strip under the...turnbuckle

[double u]

"bottlescrew" - "turnbuckle" - minute differences elude the krautophone! please elucidate!

[Wotname]

Originally Posted by double u

"bottlescrew" - "turnbuckle" - minute differences elude the krautophone! please elucidate!

Not a lot of difference, IME bottlescrew refers to a "closed body" while turnbuckle refers to an "open body".

See https://www.alibaba.com/product-deta...107015105.html

and

Different Types of Turnbuckles

I haven't seen a bottlescrew with a full thread inside but maybe they exist!

[double u]

imho open body is always to be preferred:
1. the remaining thread-length is visible
2. easy to lock with figure-8-seizing wire
my vote: https://www.stalok.com/category/bronze-turnbuckles

[charliehows]

Originally Posted by Wotname

Not a lot of difference, IME bottlescrew refers to a "closed body" while turnbuckle refers to an "open body".

See https://www.alibaba.com/product-deta...107015105.html

and

Different Types of Turnbuckles

I haven't seen a bottlescrew with a full thread inside but maybe they exist!

another 'you learn something everyday' moment for me - I just assumed the bottlescrews were threaded all the way through but now i'll have to go and pull one apart to see. Thanks - this sort of stuff is like gold to me. I have to be honest - there were also other reasons I went for the bottlescrew - got a good deal on price and I like the aesthetics too...

[Mr B]

Originally Posted by Wotname

Not a lot of difference, IME bottlescrew refers to a "closed body" while turnbuckle refers to an "open body".

See https://www.alibaba.com/product-deta...107015105.html

and

Different Types of Turnbuckles

I haven't seen a bottlescrew with a full thread inside but maybe they exist!

Thats because one end is right hand thread and the other end is left hand thread,

[double u]

they are in fact not only not "threaded all the way through", the thread is usually not even all that long. would serve no purpose too, were it longer: a nut is only so long too & after a surprising small number of turns a thread no longer bears any load (the engineers would know exactly...)

[Wotname]

Originally Posted by Mr B

Thats because one end is right hand thread and the other end is left hand thread,

I reckon that is a given for every turnbuckle and bottlescrew in the universe...
The point was another poster thought a bottlescrew might have half the body with a RH thead and the other half with a LH thread rather than a small threaded section at each end of the bottlescrew.