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What is a bolt tensioner?
In bolt tensioning, the bolt is preloaded, stretching it before the nut is tightened. The tensioner is clamped to the bolt’s threads and pushes against the flange in the surface being bolted. This provides a very consistent amount of stretch to the bolt, ensuring clamping force.
What is a hydraulic bolt tensioner?
A hydraulic bolt tensioner is an annular jack which fits over the bolt and nut to be tightened. Bolt tensioning tools can be grouped together to enable multiple bolts to be tightened simultaneously to the same high and accurate pre-load.
How do hydraulic tensioners work?
A hydraulic tensioner system consists of a hydraulic actuator in combination with a tensioner pulley. High dynamic belt loads are controlled by hydraulic damping. This damping is created when engine loads force the piston rod to move inwards displacing the oil in the cylinder.
What is residual bolt load?
Residual Bolt Load = Bolt Stress x Bolt Tensile Stress Area Units: Residual Bolt Load = (N or Tons) Bolt Tensile Stress Area = (mm2 or In2) Below are tables of standard ISO Metric and Imperial Thread forms along with applicable tensile stress area’s. Step1: Determining required bolt load from a known bolt stress.
What tools are needed for nuts and bolts?
Wrenches are used to tighten and loosen fasteners, mainly nuts and bolts. Wrenches are generally made from a chrome-plated steel alloy. The material makes wrenches both durable and simple to clean.
What is a hydraulic tensioner for?
Hydraulic Tensioners A belt tensioner or/and idler pulley is a system that guides the serpentine belt and the timing belt on a car engine. The function of a pulley and a tensioner is to limit the belt slip. The belt tensioner can be mechanic (spring-loaded) or hydraulic.
How many tensioners does a car have?
There are three main types of belt tensioners found in the replacement auto parts market. Each one works a little differently, but all ensure that your alternator and auxiliary pumps receive the power needed to keep your car or truck moving.
What is the difference between bolt tensioning and torquing?
“Torque” is simply a measurement of the twisting force required to spin the nut up along the threads of a bolt, whereas “Tension” is the stretch or elongation of a bolt that provides the clamping force of a joint. This is the most common form of providing load to a bolt.
What is bolt preload?
Bolt Preload is a term that refers to the tension created when a nut works with a bolt to hold together two materials. As the tension hits the optimal preload, the working load acting on a bolt is distributed across the assembly, in order to prevent the bolt from bearing the complete load.
How tight do you tighten a bolt?
In general, you should make the bolt tight enough so that the items it is holding together stay together, but not so tight that you damage the bolt’s threads. You should tighten bolts properly so that the bolt performs properly.
What tool would you use to tighten a bolt?
Wrenches are used to tighten and loosen fasteners, mainly nuts and bolts. Wrenches are generally made from a chrome-plated steel alloy. The material makes wrenches both durable and simple to clean.
How does a bolt tensioner work?
In bolt tensioning, the bolt is preloaded, stretching it before the nut is tightened. The tensioner is clamped to the bolt’s threads and pushes against the flange in the surface being bolted. This provides a very consistent amount of stretch to the bolt, ensuring clamping force.
What is a hydraulic tensioner?
Hydraulic Puller-tensioner A tensioner is a device that applies a force to create or maintain tension. The force may be applied parallel to, as in the case of a hydraulic bolt tensioner, or perpendicular to, as in the case of a spring-loaded bicycle chain tensioner, the tension it creates.
What is a hydraulic bolt?
Hydraulic Tensioned Bolt. The Hydraulic Tensioned Bolt eliminates conventional bolt load torquing inaccuracies that can occur from stud twist and frictional losses at the nut face and thread interfaces. The tensioned bolt integrates a hydraulic nut into the head of the bolt resulting in fewer components to handle.