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Fastener Types Jpg 720 417 Screws And Bolts Bolt Tools

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Hex galvanized lag screw 25 pack 105 model 803720 13 95. Copper based formulations may be used in interior or exterior applications and include the traditional chromated copper arsenate cca and advanced products such as alkaline copper quat acq or copper azole ca b. Galvanized steel screws nails and bolts used with copper treated wood must be hot dipped in molten zinc at 850 degrees fahrenheit. The hot dip galvanized coating provides a thicker layer of zinc than other zinc coated fasteners.

Galvanized screws are characterized by the presence of a protective zinc shell that s achieved by submerging the screws in molten zinc. Lag bolts are used when loads are of relatively large magnitude need to be transmitted through a joint and when an excessively long bolt would be required to make a connection or when one side of a through bolted connection may be inaccessible. Common metal parts used with pressure treated wood are connector plates joist hangars bracing plates and fasteners of all types. The idea that double or even triple dipped galvanized fasteners are required for corrosive environments is a frequent misconception.

Fasteners with external threads cannot be double or triple dipped galvanized. The g 185 coating is equivalent to 1 85 ounces of zinc per square foot of steel. Known as hot tip galvanizing this finishing process adds a layer of zinc over the surface of a screw. These dull gray fasteners must meet the astm a153 standard for zinc coating quality and the g 185 standard for coating amount.

The way that corrosion resistance is measured on galvanized products is to weigh them before and after submergence in a corrosive medium to find out how much of the zinc has oxidized. Owt ornamental wood ties 1 4 in. The national design specification for wood construction nds refers to these fasteners as lag screws. This means any material galvanized to either a153 or f2329 will be more than adequate for use with pressure treated timbers.

Mechanically galvanized screws are generally suitable for decks and other outdoor projects made of pressure treated lumber. Copper based preservatives hot dip galvanized or stainless steel fasteners and connectors are recommended for use when lumber is treated with a copper based preservative. Nevertheless you should not use them with pt lumber in contact with the soil in high moisture areas or in areas with salt content in the air. When a screw is galvanized it s submerged inside a container filled with molten zinc.

Hot dip galvanized steel can withstand the harsh chemicals and slow the corrosion rate. Treated lumber treated wood which is prized for its resistance to fungal decay and insect attacks is created by forcing chemical preservatives into boards through a vacuum and pressure process. It gets eaten away by the copper in treated wood.

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