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If steel and titanium are both equal in strength, then aluminum is half the strength. When you get into the 7000 series of aluminum they get to about two thirds the strength of titanium. The problem is that the ductility of aluminum is less than steel. This is what comes into play when designing parts, especially the axles and some bolts, like cylinder head bolts, the stretchiness becomes an issue with titanium. And the technical term for that is modulus of elasticity. That's why a when looking at a titanium spring, it has less coils in it. With the modulus number of titanium being half of steel it's going to flex twice as much for the same amount of load. 

So let's give an example. Let's say it's a steel bolt and you give it 1,000 pounds of force on the bolt, the bolt is going to stretch a certain amount. A titanium bolt with that same 1000 pounds of force is going to stretch twice as much. Because of stretching it will still carry the load as long as you are within the elastic limit. That's why people say they have 

machines were coming along and people could take titanium bar and machine it and make a fastener by just purely machining it out of bar stock. The problem with that is if you want to make an aircraft quality fastener, it needs to be hot forged, meaning it needs a forged head to get the proper 

 or ti on titanium nut.  With axles, a thin layer of grease is recommended so the bearing isn't beating on the dry axle.  Then, when you're doing your normal maintenance pull them out and drop them in 409 or Simple Green to soak them overnight or if you have an ultrasonic cleaner they'll come out super bright and clean again. In some places you need to use Loctite like on rear sprockets, you can use blue Loctite on it and it actually also keeps the bolts from galling. 

MMO titanium anode that using titanium as substrate and high catalytic activity of platinum group metal oxide as the coating with good electrical conductivity, small output resistance and good formability without corrosion applied widely in seawater, fresh water and soil environments. The protected metal connecting metal with smaller negative potential to form anode and the protected metal in the electrolyte solution to form a big source, this is called sacrificial anode protection, current flows through anode, electrolyte solution and then goes to the metal equipment to make metal equipment cathodic polarization protection.

Not only is standard-size grade 2 titanium pipe and tube available from inventory or quick production runs, larger sizes also can be produced by independent fabricators. Many of them also can design and produce complete piping systems, heat exchangers, and pressure vessels. This geographically diverse fabrication base has more than 25 years of engineering and design experience.

When considering the design of a stud or Gr5 titanium bolt used for cyclically loaded fastener, it is important to consider both the fastener stiffness and the stiffness of the parts being clamped. A simple formula involving these quantities dictates how the service load is shared between the unloading of the joint, and the extra load borne by the fastener. This relationship has been covered in one of the early RET Monitor articles on fasteners and in a past article in Race Engine Technology magazine*.

Bicycle titanium bolt come closest to steel in terms of strength but Ti is 47% lighter.

It’s lightweight. That low density we just talked about is what makes titanium studs lighter than those made with other metals.