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Lag Bolts

Looking for a heavy duty wood screw? Install a lag bolt. Available in plain, zinc plated and stainless steel. Lag bolts, which are also known as lag screws, are large wood screws with hexagonal heads.

The materials this bolt is available in:
-Stainless steel 18-8: The most common stainless steel for general hardware use.
-Zinc plated steel: A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
-Hot dipped galvanized steel: A low carbon steel for general use. Hot dipped galvanized (A153) for very good corrosion resistance.
-Silicon bronze: Solid bronze. An alloy of copper with greater strength and corrosion resistance than brass. Exact color varies.

Lag screws, also sometimes called lag bolts, are basically "large wood screws". Square lag screws and hex lag screws are covered by ASME B18.2.1. A typical lag bolt can range in diameters from 1/4" to 1 1/4", and lengths from 1/4" to 6" or longer, with coarse threads of a wood-screw or sheet-metal-screw threadform (but larger). The head is typically an external hex. The materials are usually carbon steel substrate with a coating of zinc galvanization (for corrosion resistance). The zinc coating may be bright (electroplated), yellow (electroplated), or dull gray hot-dip galvanized. Lag bolts are used to lag together lumber framing, to lag machinery feet to wood floors, and other heavy carpentry applications. These fasteners are clearly "screws" when defined by the Machinery's Handbook distinction. The term "lag bolt" has been replaced by "lag screw" in the Machinery's Handbook. However, in the minds of most tradesmen, they are "bolts", simply because they are large, with hex or square heads. In the United Kingdom, lag bolts/screws are known as coach screws though this can also refer to carriage bolts (round head). Lag Bolt, Galvanized Lag Bolts, Concrete Lag Bolts, Stainless Steel Lag Bolts, Black Lag Bolts, Lag Bolt Sizes, Square Head Lag Bolts, Self Tapping Screws, Lag Screw, Stainless Steel Bolts, What Is a Lag Bolt, Lag Screws, Large Lag Bolts, Lag Bolts Sizes