Weather Resistant Carriage Bolts: Simple Machine, Complex Job

The square neck in a bolt is utilized to keep the bolt from spinning as a nut is tightened to put different parts of a thing together

. Carriage bolts are designed specifically to be bolts with a square neck and do a good job in holding things together.

They're mostly used in outdoor projects like decks and docks for their strength against the elements. There are many types of bolts and one kind is the marine grade 5 hot dipped galvanized carriage bolts that are made to resist corrosion. It's also meant to give a clean finish to the whole construction that, when you're looking at the parts of a dock, it won't be easy to see these bolts.

These special bolts were used in the past to put together wheels to axles of carriages. They're inserted into a drilled hole and tapped on the head so that it's securely on the surface. It is then fastened in with a lock washer, flat washer, and a nut. Lock washer are used on the bolt to stop it from loosening. Today, carriage bolts are used with many things like bolting furniture together. They're inserted and secured in with a wrench.

The process of hot dip galvanizing actually means the application of a zinc coating on the bolt to make an iron or steel material. The material is then immersed in a bath of molten zinc and some other components. A simple machine then is transformed into one with a complex job. For its corrosion resistant quality, galvanized carriage bolts are used in many different industries like the automotive industry. Galvanizing can be found in industries using iron or steel and to improve the grip and strength of the parts being put together, galvanized carriage bolts are used.

Galvanized carriage bolts are mainly used in marine and water applications. This is because the electro chemical protection in steel is increased by the zinc coatings. Basically, the galvanized coatings protect the metal from corrosion. For places that endure a high degree of wetness and depending on what pieces are put together by the galvanized carriage bolt, there are different grades that correspond to each use. If two of the metals put together in the process of galvanization have oxide films on the surface, it can greatly inhibit galvanic corrosion. All the regular bolts and carriage bolts undergo this process to enhance its protection from corrosion.

Carriage bolts are available in many diameters like 1/4-20, 5/16-18, 3/8-16, 1/2-13, 5/8-11 and 3/4-10. Get galvanized carriage bolts if you need a more corrosion resistant kind of bolt. Depending on the thickness of the galvanized coating, galvanized carriage bolts will only work with galvanized nuts. For construction in the outdoors where a lot of rain, snow and moisture occur in abundance these kinds of bolts is what you use. They're part of the group of simple machines under screws but they do a very complex job in keeping your structures secure. That's the power of the galvanized carriage bolts.

by: Gary Hall

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