Hot Dipped Galvanized Bolt

Nuts, bolts and washers down to 8mm diameter can be galvanized and a wide range of threaded components can now be processed using special equipment.he galvanizing of one thread either internal or external requires an extra clearance of four times the coating thickness. In practice, it is normal for standard bolts from stock to be fully galvanized.

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Detailed Description for Hot Dipped Galvanized Bolt

Coating Uniformity

Whilst there is some tendency for hot dip galvanizing to be thicker in thread roots, a near uniform coating can be obtained with modern equipment. Any thickening that does occur can be accommodated in the normal truncation on the thread of the nut.

Surface Finish and Appearance

Galvanized fasteners usually have a bright light grey appearance, but with certain grades of high yield and high tensile bolts, the coating may be matt grey because the higher silicon content of the steel makes them more reactive towards the molten zinc. Fasteners hot dip galvanized at high temperature (around 550°C) tend to take on a uniform, matt grey appearance due to the structure of the coating formed when the component is cooled.

Storage

Galvanized fasteners should be stored under dry, well-ventilated conditions to minimise the occurrence of wet storage stain.

 

Specification for Hot Dip Galvanized Fasteners

Selected zinc-based protective coatings on threaded fasteners have been listed above. One difficulty arises because electroplating is often known – misleadingly – as electrogalvanizing. It is not, therefore, enough merely to specify ‘galvanizing’ if a long life is required. 

 

Friction Grip Connections

Initially, the coefficient of friction with galvanized contact surfaces is low – an average of about 0.19. As slip commences, however, friction rapidly builds up and ‘lock-up’ occurs due to cold welding between the coated surfaces. If a small amount of slip can be tolerated it is therefore unnecessary to treat the surfaces, but if all slip must be avoided, the coefficient of friction can be raised by roughening the surface of the galvanized coating. 

 

 

 

 


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