What is a Makita shear wrench used for?
These cordless shear bolt wrenches are made by Makita. They are used to drive tension control bolts to ensure the correct tension is achieved and overtightening does not occur. They are powered by two 18V batteries. Tool batteries can often be used with tools of the same brand, battery series, and voltage.
How do tc bolts work?
A tension control bolt (TC bolt) is a heavy duty bolt used in steel frame construction. The end of the shank has a spline on it which is engaged by a special power wrench which prevents the bolt from turning while the nut is tightened. When the appropriate tension is reached the spline shears off.
What does TC on a bolt mean?
A tension control bolt (TC bolt) is a heavy duty bolt used in steel frame construction. The head is usually domed and is not designed to be driven. The end of the shank has a spline on it which is engaged by a special power wrench which prevents the bolt from turning while the nut is tightened.
What are twist off bolts?
These assemblies’ function by calibrating the torque needed to twist off a splined extension manufactured into the bolt shank. Made correctly, the “twist-off” will occur at a bolt pretension above the minimum required.
Where are TC bolts used?
Today, tension control bolts are used almost exclusively around the world in the construction of Steel Bridges, High Rise Building Structures and Stadia, and are the first choice for engineers who demand the highest standards of bolting integrity.
What is a splined bolt?
Spline fasteners are high tensile strength fasteners with smaller heads than comparable conventional hex fasteners.
What happens if you dont use a torque wrench?
Too tight and something will break, it may be the thread on the bolt, or much worse the thread on in the hole. Bolts will also break, sometimes leaving a very hard to remove bit in your frame.
Are TC bolts galvanized?
Tension control bolts are available in one of two different types: ASTM: A325 tension control bolts (F1852), in plain or mechanically galvanized, and ASTM: A490 bolts (F2280), which are plain and not available with a coating.