Lag Bolts - Vivid Fasteners and Tooling
Lag Bolts
Available
in various finishes for any application
Lag bolts feature a hex head and are designed to be driven with
a wrench or hex driver. Lag screws are also commonly called lag bolts because
they are significantly larger than most other screws. Essentially, it is just a
very large wood screw with the threads extending to the top. They feature the
sharp cutting threads of a wood screw or sheet metal screw and have a shoulder
below the head (in longer lengths), however everything is scaled up in size for
use in larger applications. These screws typically need a pre-drilled whole and
are not recommended as self-tapping.
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 The term "lag bolt" has been replaced by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. [16] However, in the minds
of most tradesmen, they are "bolts", simply because they are large,
with external-hex heads. In the United Kingdom, lag screws are known as coach
screws.
Stainless
Steel Lag Bolts
Hex lag screws in corrosion resistant 304 stainless steel. Lag
screws, are basically "large wood screws". A typical lag bolt is 6
inches long, 3/8 diameter screw with coarse threads of a wood-screw or
sheet-metal-screw thread form (but larger). Stainless Steel Coach Screws in
this selection feature an external hex head. The materials are stainless steel
for corrosion resistance. Grade 316 stainless steel lag screws are
significantly more corrosion resistant than 304 and are ideal in harsh and
saltwater environments.
Hot
Dipped Galvanized Lag Screws
Hot dipped galvanized lag screws offer corrosion resistance to
steel fasteners due to the molten zinc bath finishing process, creating a
bonded alloy coating. The HDG process creates a tightly bonded alloy on the
screws for superior corrosion resistance and harsh environment applications.
HDG products must be used exclusively when applied, meaning that a plain zinc
nut or stainless nut cannot be applied to an HDG bolt. HDG nuts are threaded
slightly larger than other nuts to make room for the thickness of the
galvanized coating.
Silicon
Bronze Hex Lag Screws
Hex lag screws in corrosion resistant Silicon Bronze. A typical
screw is 6 inches long with coarse threads of a wood-screw or sheet-metal-screw
thread form (but larger). Silicon Bronze Lag Screws in this selection feature
an external hex head. The materials are silicon bronze for corrosive, marine,
and high heat environments.
Zinc
Plated Steel Hex Lag Bolts
Lag screws with a zinc plated finish (CR+3) offer protection to
the case-hardened fastener. They are available in standard SAE inch sizes in
various lengths. While they have a protected layer of zinc, these screws are
not as corrosion resistant as HDG and are not recommended for exterior use.
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