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    ITH - Tensioning Tools

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    ITH was the first manufacturer who introduced friction-free tightening of wind turbine bolts via the ITH-Stretch-Method. The ITH-Stretch-Method is now used by nearly every wind turbine manufacturer. The compact design of the single stage (ES) and multi-stage (MS) bolt tensioning cylinders enables quicker assembly time, saving time and money. For over 20 years, ITH has provided solutions for specific wind power applications, i.e., multi-tensioning system for blade bearings, robot tensioner, etc.

    Fabrication Time: 1 week

    Standard features:

    • Patented safety fracture device
    • Automatic piston return
    • Exchangeable change bushing/turning sleeve
    • Measurement hole for bolt elongation
    • Direct gear drive to tighten the nut
    • Spring loaded turning sleeve
    • Stroke limitation
    • Control notch for nut


    Optional features:

    • Patented cycle counter
    • Chrome-Nickel surface coating NIOX
    • Patented safety carrying handle
    • Safety measuring pin for thread projection
    • Swivel-Connector for High Pressure Nipple
    • Multi-Tensioning High-Pressure-Connector

    Stock Number Thread Size (D) Assembly Dimension (A) Thread Projection (P)
    MS 30 M30 36 mm 60 mm
    MS 33 M33 39 mm 65 mm
    MS 36 M36 42 mm 70 mm
    MS 39 M39 46 mm 80 mm
    MS 42 M42 50 mm 85 mm
    MS 45 M45 55 mm 90 mm
    MS 48 M48 57 mm 100 mm
    MS 52 M52 62.5 mm 105 mm
    MS 56 M56 66.5 mm 110 mm
    MS 60 M60 68 mm 120 mm
    MS 64 M64 70 mm 130 mm
    Stock Number Thread Size (D) Assembly Dimension (A) Thread Projection (H)
    ES 30 M30 49 mm 60 mm
    ES 33 M33 54 mm 65 mm
    ES 36 M36 59 mm 70 mm
    ES 39 M39 64 mm 80 mm
    ES 42 M42 69 mm 85 mm
    ES 45 M45 74 mm 90 mm
    ES 48 M48 79 mm 100 mm
    ES 56 M52 90 mm 105 mm
    ES 64 M64 106 mm 110 mm
    Stock Number Thread Description (D) Strength        [kN / lbs] Stroke (mm) Assembly Dimension (A) Thread Projection (H)
    ESH       3457 10", 11" (1.5")   Grade 75 ksi 360 kN            81.000 lbs 15 mm 42 mm 205 mm
    ESH       3459 10", 11" (M39) Grade 75 ksi 550 kN 123.750 lbs 12 mm 50 mm 205 mm
    ESH      3463 10", 11" (M39) Grade 75 ksi 550 kN 123.750 lbs 25 mm 50 mm 240 mm
    ESH       3561 10", 11" (M39) Grade 75 ksi 800 kN 180.000 lbs 15 mm 58 mm 205 mm
    ESH      3563 10", 11" (M39) Grade 150 ksi 800 kN 180.000 lbs 25 mm 58 mm 240 mm
    ESH       3454 M36 540 kN 121.500 lbs 16 mm 42 mm 170 mm
    All goods are custom made and Non-returnable. Any return must be negotiated, include a return authorization number and will be subject to a restocking fee.

    Standard features:

    • Patented safety fracture device
    • Automatic piston return
    • Exchangeable change bushing/turning sleeve
    • Measurement hole for bolt elongation
    • Direct gear drive to tighten the nut
    • Spring loaded turning sleeve
    • Stroke limitation
    • Control notch for nut


    Optional features:

    • Patented cycle counter
    • Chrome-Nickel surface coating NIOX
    • Patented safety carrying handle
    • Safety measuring pin for thread projection
    • Swivel-Connector for High Pressure Nipple
    • Multi-Tensioning High-Pressure-Connector

    Stock Number Thread Size (D) Assembly Dimension (A) Thread Projection (P)
    MS 30 M30 36 mm 60 mm
    MS 33 M33 39 mm 65 mm
    MS 36 M36 42 mm 70 mm
    MS 39 M39 46 mm 80 mm
    MS 42 M42 50 mm 85 mm
    MS 45 M45 55 mm 90 mm
    MS 48 M48 57 mm 100 mm
    MS 52 M52 62.5 mm 105 mm
    MS 56 M56 66.5 mm 110 mm
    MS 60 M60 68 mm 120 mm
    MS 64 M64 70 mm 130 mm
    Stock Number Thread Size (D) Assembly Dimension (A) Thread Projection (H)
    ES 30 M30 49 mm 60 mm
    ES 33 M33 54 mm 65 mm
    ES 36 M36 59 mm 70 mm
    ES 39 M39 64 mm 80 mm
    ES 42 M42 69 mm 85 mm
    ES 45 M45 74 mm 90 mm
    ES 48 M48 79 mm 100 mm
    ES 56 M52 90 mm 105 mm
    ES 64 M64 106 mm 110 mm
    Stock Number Thread Description (D) Strength        [kN / lbs] Stroke (mm) Assembly Dimension (A) Thread Projection (H)
    ESH       3457 10", 11" (1.5")   Grade 75 ksi 360 kN            81.000 lbs 15 mm 42 mm 205 mm
    ESH       3459 10", 11" (M39) Grade 75 ksi 550 kN 123.750 lbs 12 mm 50 mm 205 mm
    ESH      3463 10", 11" (M39) Grade 75 ksi 550 kN 123.750 lbs 25 mm 50 mm 240 mm
    ESH       3561 10", 11" (M39) Grade 75 ksi 800 kN 180.000 lbs 15 mm 58 mm 205 mm
    ESH      3563 10", 11" (M39) Grade 150 ksi 800 kN 180.000 lbs 25 mm 58 mm 240 mm
    ESH       3454 M36 540 kN 121.500 lbs 16 mm 42 mm 170 mm