The ITH program includes all types of tool used for tightening and loosening large bolts as well as the required accessories.
Thanks to its innovative power and technical expertise, ITH has been able to expand its range of tensioning tools to its current impressive level. Our comprehensive range of products enables us to offer each of our customers the best and most efficient tools and methods for their particular applications.
Stretching tools
Rotating tools
Bolt-tensioning cylinders
Torque wrenches
Power wrenches
Alpha turn-angle tools
Hydraulic pumps
Torque wrenches
Power wrenches
Hydraulikaggregat
Nut splitter
Manual tools
Stretching tools
We describe the ITH hydraulic bolt-tensioning cylinders as stretching tools because they stretch the bolts in a way that is completely free of friction and torsion. The principle of the bolt-tensioning cylinder, the ITH Stretch Method, is explained briefly below, as well as its advantages in relation to the torque process. The navigation system takes you to examples and gives a general overview of the different products.
The Stretch Method:
Bolt connections, which are pre-tensioned using the ITH Stretch Method, achieve a reproducible pre-tensioning force with a close tolerance of ?.5%.
A bolt-tensioning cylinder is threaded onto the projecting thread of the bolt. Hydraulic pressure is then applied by means of a hydraulic unit, thereby extending the bolt without any twist or friction. The hydraulic pressure of the bolt-tensioning cylinder has a linear relationship to the pre-tensioning force of the bolt-tensioning cylinder, thereby assuring a high degree of reproducibility. Once the required hydraulic pressure is achieved, the nut is threaded down free friction using a manual torque wrench with a defined torque.
All ITH bolt-tensioning cylinders are designed for the required tension of the bolt. Thanks to this principle and the absence of torsion and friction, it is possible to pre-tension the bolt to 98% of the yield strength.
Threading the bolt-tensioning cylinder on using a hand ratchet or power wrench
The pre-determined hydraulic pressure is applied and the bolt is stretched without friction or twist.
Threading the nut down with torque control using a manual torque wrench. The connection is now pre-tensioned.
Advantages of the ITH stretch method:
The ITH Stretch Method has a number of advantages over the conventional torque process. For tensioning, the standard torque process first has to overcome the moment of the thread pitch as well as the frictional resistances in the thread and on the contact surface. Due to the widely varying resistances, the pre-tensioning of the bolt may vary by up to 100% (friction class B μges 0.08 to 0.16).
Advantages at a glance:
High pre-tensioning forces with small tool dimensions (e.g. thread W 510 or M340; 45,000 kN)
No bending stress in the bolt
Only tensile stress in bolt
Simultaneous parallel pre-tensioning of several bolts (multi-tensioning system)
One bolt-tensioning cylinder can be used on bolts of several dimensions
Perfect for use with stainless steels as there is no risk of cold soldering (seizing) of the thread.
Bolted joints subject to high temperatures (e.g. in gas turbines) can be released even after long periods of time.
Linear relation between the pre-tensioning force of the bolt and the hydraulic pressure of the bolt-tensioning cylinder guarantees high reproducibility.
Low αA value for certain grip lengths.
Well suited for on-site assembly.
Rotating tools
All the rotating tools produced by ITH function according to the torque method. Our product program of bolting tools is divided into torque wrenches and power wrenches.
Take advantage of the long experience of the ITH designers and our high-precision bolting technologies. Click on the links below for an overview of our products and find the perfect solution for your own application. Contact us for personal assistance!
ITH - torque wrench
ITH - Power wrenches
Alpha turn-angle tools
The ALPHA turn-angle tools function according to the turn-angle process. First of all, the flange is drawn together by torque in order to define a starting point for the turning angle (joining moment). The bolt is then turned by a further amount corresponding to the defined turning angle.
Alpha turn-angle tools
The Alpha tools are available in two versions:
Power wrench EDS α
Torque wrench DR / DK α
Advantages of the ALPHA turn-angle tools at a glance:
High reproducibility
Customer-specific design (e.g. thread size, control program)
6 power classes from 400 to 6,000 Nm with EDS
Perfect for precise tensioning of smaller dimensions up to M27
Documentation of tensioning process (option)
Nut splitter
ITH nut splitters remove rusty or seized nuts of any kind quickly and safely. ITH nut splitters have their ideal field of application in areas where the use of thermal cutting processes is prohibited, e.g. in the petrochemical and gas-supply industries. When ITH nut splitters are used, it is often possible to re-use the bolts, thereby permitting cost-savings.
ITH nut splitters are available in two types:
Type SF for flange joints
Type MS for joints in general mechanical engineering applications
Design / function:
Single-action high-pressure hydraulic cylinder with spring return
Two-part high-pressure compression
Light and convenient design for simple handling and fast operation
Replaceable cutter and cutter head
Bolt thread is not damaged (cost factor)
Type SF
Features:
Used for flanges (e.g. in petrochemical industry)
Safer for removing nuts than chiselling, abrasion cutting or flame cutting
Numerous variations permit safe efficient working
Customer-specific designs possible
Type MS
Features:
Universal in use
Flat cutter head for direct application of the MS to the flange
Safer for removing nuts than chiselling, abrasion cutting or flame cutting
The ITH Stretch Method has a number of advantages over the conventional torque process. For tensioning, the standard torque process first has to overcome the moment of the thread pitch as well as the frictional resistances in the thread and on the contact surface. Due to the widely varying resistances, the pre-tensioning of the bolt may vary by up to 100% (friction class B μges 0.08 to 0.16).
