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Tension nut

The ITH type TN tension nut uses the differential thread principle for tension-optimized, torsion-free pre-loading of bolts – without replacing the bolts.

Torsion-free

Pretensioning by tensile force

Temperature resistant

Ideal for high-temperature connections

Retrofittable

Existing bolts bolts are retained

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ITH Smart Tools

With ITH Smart Tools, you can make a wide variety of bolting tools simple and smart – regardless of the device type. Thanks to the cloud connection, you can detect, monitor and document assembly processes centrally, across locations and in real time. Benefit from maximum transparency, efficiency and traceability in your production.

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Tension nut Specifications

With the ITH type TN tension nut, you are setting an innovative solution for the safe, precise and durable pre-loading, pre-tensioning of bolted connections – even at high temperatures and under demanding operating conditions.

Innovative differential thread principle
The ITH tension nut consists of three components and operates according to the differential thread principle. The pre-load force is transmitted purely axially from the Bolt Tensioning Cylinder to the bolt via the tension sleeve, thus avoiding additional torsional or bending loads.

Optimally suited for high-temperature areas
The tension nut offers decisive advantages, especially for connections exposed to high temperatures: There is no need to overcome high static friction when loosening, which significantly reduces the risk of damage to fasteners and tools. The bolts can be used several times without having to be replaced.

Efficient stress distribution and increased fatigue strength
The special thread of the tension sleeve and the FEM-optimized geometry achieve a very even stress distribution in the connection. This significantly increases the fatigue strength of the bolt compared to conventional nuts.

Simple retrofitting and system flexibility
The patented ITH tension nut can be fitted to existing bolts in a simple way – replacing the bolts is not necessary. This saves time and costs during assembling and maintenance.

Three-part, patented construction
Differential thread for axial power transmission
FEM-calculated geometry
stress-optimised design
Suitable for existing bolts
Compatible with ITH Bolt Tensioning Cylinders

Optional:

Individual designs and special sizes
Technical advice and designing for special applications

Type	Order no.	Preload	Thread	Across flats ( A/F-width )	Necessary ⌀	Height
Type	Order no.	[kN]	[mm]	[mm] [mm]	[mm] [mm]	[mm] [mm]
TN 30	43.xxxx	290	M30x3.5	46	55	43
TN 33	43.xxxx	385	M33x3.5	50	61	50
TN 36	43.xxxx	450	M36x4	55	67	52
TN 39	43.xxxx	565	M39x4	60	72	59
TN 42	43.xxxx	620	M42x4.5	65	78	60
TN 45	43.xxxx	715	M45x4.5	70	88	65
TN 48	43.xxxx	815	M48x5	75	96	69
TN 52	43.xxxx	1.000	M52x5	80	97	78
TN 56	43.xxxx	1.125	M56x5.5	85	104	82
TN 64	43.xxxx	1.500	M64x6	95	116	93
TN 72	43.xxxx	2.000	M72x6	105	12	108
TN 80	43.xxxx	2.500	M80x6	115	148	118
TN 90	43.xxxx	3.250	M90x6	130	168	135
TN 100	43.xxxx	4.100	M100x6	145	187	150

Insert image of technical dimensions

ITH tension sleeve (Tension Nut) type TN (consisting of tension sleeve, pressure sleeve and pressure disk)
operating instruction
Optional accessories upon request

Product information for download