Bolts Needed

[Sven137]

Hi

 

I'm looking for rear shock mounting bolt for my Yeti... i need a titanium bolt as the normal ones keep snapping.

Any idea where can i buy bolts in Johannesburg ?

[Paul Ruinaard]

If you have the bolt then you can go to Ran Airport in Germiston where they supply specialist things like Titanium bolts for the aircraft industry. My brother used to buy his parts for his gliders there. Google bolts for aircraft. Will set you back some. 

[droo]

A titanium bolt will help exactly zort. What bolt is in there at the moment? Original or a hardware store replacement?

[BaGearA]

Boltfast

[CAAD4]

Sven is that you??

[kosmonooit]

You only use Ti bolts for weight saving if you have $$$ to throw at the problem. I dont think this is your solution

 

Is the bolt shearing? Try a high tensile bolt, it should be stronger shear wise, anf JKM Industrial Supplies in Randburg should be able to help you, take a sample

 

http://www.jkm.co.za/

[Sven137]

A titanium bolt will help exactly zort. What bolt is in there at the moment? Original or a hardware store replacement?

 

The bolt is not the original

 

You only use Ti bolts for weight saving if you have $$$ to throw at the problem. I dont think this is your solution

 

Is the bolt shearing? Try a high tensile bolt, it should be stronger shear wise, anf JKM Industrial Supplies in Randburg should be able to help you, take a sample

 

http://www.jkm.co.za/

 

 

The bolt sheered on the short end. ...  I know i need to loose 10kg.. lol

[droo]

The bolt is not the original

 

Then you need a high tensile bolt, not a Ti one. Ti will break before steel.

 

Also, if the bolt keeps breaking, chances are there's something else wrong - misalignment, overtorqued, etc etc...

[ChUkKy]

I snapped a titanium one on my old Tallboy.

Replaced it with a high tensile steel one and never looked back.

 

I just pressed that last bit of poo out before each ride to negate the weight difference between the old Ti bolt and the steel one.

[droo]

I snapped a titanium one on my old Tallboy.

Replaced it with a high tensile steel one and never looked back.

 

I just pressed that last bit of poo out before each ride to negate the weight difference between the old Ti bolt and the steel one.

 

Here is a man who understands.

[David Marshall]

Take the bolt to JKM Industrial supplies in Randburg.  Try to match the unthreaded part of the bolt  (the part that sits in the shock hardware) to what they have and cut to length.  They stock stainless and high tensile.

[Cruz Addict]

you need at least an A1 hardened steel bolt, using Ti bolts on suspension linkage is never a good idea, one hard landing and bang its toast. i had a similar problem on my scott ransom, i kept breaking the suspension linkage bolt. no matter what i bought they always broke, if not they bent which was even worse as getting them out becomes very difficult

 

found an engineering shop in Randburg to whom i explained the problem. they suggested i bring a  sample and they would make up an A1 bolt for me, as a standard M3 bolt i was able to get a sample form builders at like R4 or something stupid like that, took to them and viola had an A1 which worked like a demon till i snapped the frame itself. that was 2 or so years on. you can get harder but then there are other complications like corrosive properties etc to consider.

Edited April 25, 2018 by Cruz Addict

[Plentipotential]

There are some weird and wonderful ideas on bolt strengths here. I've been in the fastener business for 33 years and have never heard of A1 steel bolts.

 

Chukky has it right, high tensile, grade 8.8. If you think the rust will be a problem use stainless steel, make sure the head is marked "A2 - 70" or "A4 - 70" If you tell me where in Gauteng you are I'll direct you to a fastener supplier.

 

For general info on bolt strength and tensile/sheer properties I'll add this. Terms used are not technical so that idiots like me can understand.

 

Something to think about.

 

Ever wondered what Grade 8.8 actually means?

 

Grade 8.8

 

By definition the first number (8) stands for 100N/mm2 of Tensile Strength, so in the case of grade 8.8 this would be 800N/mm2.

The digit after the dot (.8) gives the Yield Strength as a percentage of the Tensile Strength. i.e. 0.8 X 800 = 640N/mm2 Yield Strength.

 

The Tensile Strength gives the amount of tension that the fastener must be able to withstand without failing, or snapping, so up to and including 800N/mm2.

The Yield Strength gives the amount of tension that the fastener must withstand before it starts to permanently deform, up to and including 640N/mm2.

 

The same principal applies across all grades of metric fasteners like 10.9, 12.9 etc. 

 

Basic as I said, I'm sure the engineers will be along shortly to pull it apart but it is written to give a basic understanding. Stainless steel fasteners are either -50, - 70 or -80 Means the same thing, A2 - 70 is an A2 or 304 grade stainless with a tensile strength of 700N/mm2

Edited April 25, 2018 by Plentipotential

[Cruz Addict]

There are some weird and wonderful ideas on bolt strengths here. I've been in the fastener business for 33 years and have never heard of A1 steel bolts.

 

Chukky has it right, high tensile, grade 8.8. If you think the rust will be a problem use stainless steel, make sure the head is marked "A2 - 70" or "A4 - 70" If you tell me where in Gauteng you are I'll direct you to a fastener supplier.

 

For general info on bolt strength and tensile/sheer properties I'll add this. Terms used are not technical so that idiots like me can understand.

 

Something to think about.

 

Ever wondered what Grade 8.8 actually means?

 

Grade 8.8

 

By definition the first number (8) stands for 100N/mm2 of Tensile Strength, so in the case of grade 8.8 this would be 800N/mm2.

The digit after the dot (.8) gives the Yield Strength as a percentage of the Tensile Strength. i.e. 0.8 X 800 = 640N/mm2 Yield Strength.

 

The Tensile Strength gives the amount of tension that the fastener must be able to withstand without failing, or snapping, so up to and including 800N/mm2.

The Yield Strength gives the amount of tension that the fastener must withstand before it starts to permanently deform, up to and including 640N/mm2.

 

The same principal applies across all grades of metric fasteners like 10.9, 12.9 etc. 

 

uh wow, 33 years. no offence meant to your trade or what you do for a living but i would be very nervous of using you as as a supplier based on that statement:

 

https://www.bssa.org.uk/cms/File/Microsoft%20Word%20-%20SSAS2.31-Fastener%20Grades%20A1,A2_A3_%20&%20A4_A5_%20to%20BS%20EN%20ISO%203506.pdf

Edited April 25, 2018 by Cruz Addict

[Plentipotential]

uh wow, 33 years. no offence meant to your trade or what you do for a living but i would be very nervous of using you as as a supplier based on that statement:

 

https://www.bssa.org.uk/cms/File/Microsoft%20Word%20-%20SSAS2.31-Fastener%20Grades%20A1,A2_A3_%20&%20A4_A5_%20to%20BS%20EN%20ISO%203506.pdf

 

None taken, you must learn to read properly. "33 years and have never heard of A1 steel bolts."

 

The emphasis on steel

[Plentipotential]

Steel is not stainless steel, austenitic is stainless steel. Love to get the contact details of an engineering shop that will make you one bolt to fit a bicycle from A1 steel, your description, and heat treat it.