Frequently Asked Questions about Stainless Steel Fasteners (Part 2)

Here are some of the most frequently asked questions (FAQs) and answers about stainless-steel fasteners that our team receives:

 

 

  • Most stainless steel fasteners I have seen have marks on the head. What are these?

 

There are two types of marks on a bolt:

    1. The first is the manufacturer's or importer’s mark, which is a symbol identifying the manufacturer, and
    2. The second is the grade mark which is a standardized mark that identifies the material properties that the fastener meets.

 

 

  • We need help because when we tighten stainless steel bolts, they tend to seize. Can you kindly assist?

 

Cold welding is common with stainless steel material. This happens when the metal forms an oxide to protect against corrosion. This leads to increasing adhesion problems during tightening. And, in extreme cases, the actual freezing together of the threads.

 

You can solve the problem by trying the following:

    1. Slowing down the installation RPM speed,
    2. Frequent lubrication of the internal and/or external threads, and
    3. Using different combinations of nut and bolt materials.

Hope this helps you.

 

 

  • The specifications on the fastener don’t include the shear strength. How can I find it?

 

The shear strength of a steel fastener is about 0.6 times the tensile strength.

 

 

  • Do the fine threaded fasteners have any unique benefits over the coarse threaded fasteners?

 

Yes, they do and these benefits include:

    1. Less tendency to loosen,
    2. Finer adjustments due to their smaller pitch,
    3. More strength size for size compared to a coarse thread,
    4. Easier to tap into hard materials and thin-walled tubes, and
    5. They require less torque to develop equivalent bolt preloads.

If you have any more questions about stainless steel fasteners, don’t hesitate to get in touch with us today.

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