7 Things You Should Know About Nuts & Bolts

Posted by bolt_admin


Posted on May 5, 2018



1 .Labelling: Bolts and Nuts have classifications and they are indicated by alphanumeric terms, such as:3A, 2B, 1A, etc. This indicates the thread class. The thread is the spiral engraving used in a bolt. From loose to tight the numbers increase. Example: 1 = loosest, 2 = medium and 3 = tightest. The letter A or B indicates external and internal respectively. The most common bolts are 2A and 2B because they are the most suitable for domestic use. They are also a good balalnce between quality and price.

2 .They always come together: Bolts and Nuts always come together, the fasteners which have a bolt like look, but do not have a nut are called screws. Bolts always have a nut for fastening from both sides.

3 .Threads equate to strength: There are two kinds of threads in bolts: coarse and fine. Fine threads allow for greater strength because they have more area to hold stress. Coarse threaded bolts on the other hand are suitable for quick use, and for things which require frequent assembling or reassembling.

4 .Stainless Steel bolts are self-repairing: Stainless steel materials – especially bolts and nuts – are made to prevent corrosion and rust. The trick is, the surface comes into contact with oxygen and makes a layer of insulation, which prevents water or external material from touching its inner material. A scratch on the surface is healed when a new layer is formed on top of it due to its reaction with oxygen.

5 .Stainless Steel can still catch rust: Yes, you read that right. Stainless steel protects its inner content by producing a protective layer by reacting with the oxygen in the air. However, in low oxygen environments, the production of this layer can get hampered, allowing water to settle in which can then lead to rust. That being said, this doesn’t happen in most of the cases, but it is possible.

6 .Colour doesn’t have any influence on performance: The coatings or platings on a bolt or nut has absolutelu effect on its performance.

7 .Too tight is not always good: It’s a normal human tendency to think that the tighter a bolt is fastened, the more secure the structure will be. This is not true. For industrial uses – and strongly recommended for residential use – you need to determine how much pre-load should be given. Too tight bolts may break when external weight or force is exerted. The opposite may cause tightening failure, that’s why it is recommended to find that perfect balance.

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