During hot-dip galvanized bolt method, excess zinc has a possibility to build up in threaded portion of a fastener. One misconception in regards to galvanized bolts is that the threads are cut undersized to accommodate for the excess 2-6 mils of thickness which hot-dip galvanizing adds. Actually, bolts are threaded in the same regardless of whether they will be galvanized. It is the galvanized bolts which are tapped oversize to ensure proper fit. When galvanized bolts are chased, some or all zinc is then removed from the threaded area, galvanized bolts which are tapped oversize will then be too loose and possibly not generate the proper clamping impact required of the connection.

Galvanized bolts custom galvanizing system had been specifically designed for fasteners and uses centrifugal force in order to clean the threads. After parts are removed from molten zinc they are immediately then spun using a high-speed centrifuge in order to remove the excess zinc. This process creates high quality galvanized bolts and a trouble-free nut fit.

According to AGA or the American Galvanizers Association, the weight of an item will increase about 3.5% from a zinc added during the galvanizing method. However, the AGA goes on saying, “…that figure can vary greatly depending on numerous factors. The fabrication’s shape, steel chemistry, and size all play a major role, cialis generic vs brand other factors like black weight; the different types of steel which get welded together, with the galvanizing bath chemistry may also have an effect.”

When considering galvanized fasteners, the percentage is often lower. For example, the actual increase on the weight of galvanized bolts compared to regular plain bolts is approximately 0.26%. The zinc thickness requirement designed for hot-dip galvanizing threaded fasteners must be covered by ASTM F2329. This specification states an average minimum coating thickness on 1.7 mils (.0017 in.). Overall the weight increase of bolts due to zinc from galvanizing fairly is minimal.

ASTM recommends that if protective coating is required for an A490 bolts, Zinc/Aluminum Corrosion Protective Coating then should be used in accordance to F 1136 Grade 3.

This recommendation is based on research findings conducted by Industrial Fastener Institute (IFI 144). No other metallic coating is then allowed unless authorized by ASTM’s Committee F16. One Tadalis SX trade name of this is Dacromet.

Another option is to specify particularly ASTM A490 Type 3. This fastener is created from weathering steel which is then inherently corrosion resistant. However, these fasteners are not readily available in the market as A490 Type 1. Consulting an engineer involved on the project always is the best solution.

Some high strength bolts may be galvanized while others can’t. In the construction fastener industry, generally the phrase “high strength” points to bolts that had been quenched and tempered to develop the proper strength-requirements of a given specification. Two separate issues are now involved in determining whether a high strength bolt can then be galvanized.

Author Bio: At Wholesalebolts.com we specialize selling galvanized bolts at wholesale prices to help you receive the best value. We specialize in selling wholesale bolts at wholesale prices with no minimum order. Gary Hall is a freelance writer.

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