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Portland Bolt uses National Upsetters
to hot forge heads onto bolts.
Our six Upsetters allow us to produce headed
bolts ranging from 1/2" diameter - 2-1/2" diameter.
The first step of the forging process is
to place one end of the steel roundbar
in an induction coil that heats the end of the bar
to between 1,800 and 2,100 degrees Fahrenheit
The exact temperature required varies depending on
the diameter and grade of steel being used and the
head style which will be forged onto the end of the bar.
Once the end of the bar has been heated to the required
temperature, the headerman places it into the Upsetter
where gripper blocks clamp the round bar securely
in place, while a plunger compresses the heated end
of the rod, reshaping it into the chosen head configuration.
A second position in the gripper block is used
to stamp the head with the manufacturer's logo
and grade symbol on certain types of headed bolts.
This creates a bolt that is a single, continuous
piece of steel, making it structurally superior to
to a rod with a nut.
One of the many advantages to manufacturing bolts
in an Upsetter, as opposed to other forging equipment
like a press, is that presses are limited in the length
of bolt they can manufacture.
Our Upsetters produce headed bolts with no such
length limitation, and we routinely manufacture
headed bolts that are 4, 6, 8 feet or longer!
Common construction fastener head styles include
hex, heavy hex, square, carriage, timber, and countersunk.
Applications for headed bolts include
structural steel connections, wood construction,
marine sturctures, and embedding the headed end
in concrete for use as an anchor bolt.
We can even create custom head tooling
to manufacture unique head styles, or bolt heads
that can feature your company name, or logo.
For headed bolts required on your next construction
project, contact Portland Bolt.