FAQ : Products/Fasteners

What type of stainless steel are your studs made from?

Our studs are made from 347 stainless steel. This type of stainless steel is used extensively in both marine and aerospace applications for it's stability at high temperatures, strength, and corrosion reistance.

I have seen other companies sell stud sets for over three times as much as you charge, are what is different about your studs?

The main difference between our studs and the other studs on the market is the composition. "Stainless 300" is what many of the other studs on the market are classified as(by their manufacturer). They do not say what specific grade of it is and we must assume that it is a proprietary alloy. What we can infer from "Stainless 300" is that it is a 300 series stainless steel (non-hardenable) and thus offers good strength and corrosion resistance like all other 300 series stainless steels. See above for the grade of steel we use.

The other feature that seperates their studs from our is the "hex broach" in the end of the stud. This is a nice feature but it adds another secondary process to the manufacturing of the stud, which in turn increases the price. We chose to not broach our studs to save our customers money, and in our opinion it isn't worth it. Refer to the Tech FAQ for installation instructions for our studs, you will find them to be very easy to install.

What is the difference between stainless nuts and copper plated lock nuts and is one better than the other?

The big difference between the two types of nuts is that the stainless nut is a NON locking nut, the copper plated nuts are a LOCKING nut. The stainless nuts utilize a lock washer (included in the sets) to keep the nut from turning off the stud. The copper plated nuts have a 'crimped' end that will create friction between the male threads of the stud and the female threads of the nut, the friction keeps the nut from turning off the stud.

You will be OK using either style nut for this application. We offer both because many people prefer one style of fastening method over the other. Some people like the look of all stainless, some like the look of copper.

How are the threads on your studs manufactured?

The threads on our M8 studs are manufactured using a manufacturing process called "rolling" (our new M10 studs are cut, not rolled). A rolling die, which is a hardened tool with the thread profile, is pressed onto the raw rod stock. The force is gradualy increased as the threads are being formed, during this process the steel is cold worked. Cold working will produce stronger/more durable threads, as well as increasing the studs yield strength.

Some other stud manufacturers cut their threads. Threads that are cut using a CNC lathe are not as durable as rolled threads of the same material.

Why are the metal ends of your DSM studs a few millimeters shorter than the OEM studs?

The metal ends (end of the stud that threads into the cylinder head) of the factory studs are longer than they need to be. There are no adverse affects to the shorter ends on our studs (they are shorter for manufacturing ease). Longer metal ends will not make the fasteners any stronger.