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Q: What are high strength friction bolts
A:

Turned and fitted bolts are similar to 'ordinary' grade 4.6 and 8.8 bolts, but are machined on their shanks and installed in reamed holes. This create a very tighly fitting bolt, slip is negligible, and higher stresses can be used. Due to high cost of the bolts themselves and the costs of installation, these bolts are not often used.

Q: What's the difference between 4.6 and 8.8 bolts
A:

Bolts are available in standard size and a range of lengths.

Bolts can act in two ways, namely in tension and shear. The individual parts of a bolt comprise a hexagonal head and a circular section shank, which may be fully or partly threaded. They come in shank diameters from very small (6mm) up to 36mm. Larger diameters may be available to special order.

Q: Is galvanising better than zinc metal spray?

People ask us all the time, "Is galvanising better than zinc metal spray?". Here is a customer who uses arc zinc metal spray and who conducted tests to determine how well it works and their conclusion is it is better for their application.

A:

http://www.tyco-fire.com/TFP_common/ZincAlt.pdf