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Manufacturing, engineering and integral logistics

Minimum guaranteed preload 80% of bolt yield stress

TSF has designed, developed and patented the TSH-SH preload systems with the following objectives:

  • Provide bolted joints with high requirements in preload.
  • Provide bolted joints with high requirements in preload and untightening resistance.


  • Reduced number of fixation elements with respect to torque control.
  • Quick reach of preload.
  • Low dispersion (less than 5%).
  • High stability of the preload.
  • Low factor of load distribution for the fixation element. Lower fatigue range.
  • Preloading by the use of pressure tables.
  • Insensitive to bending moments.
  • No twisting of the fixation element.
  • Benefits of elongation, without the disadvantages of friction.
  • Ease of assembly and disassembly.
  • Simultaneous assembly of fastening elements. Elimination of elastic interaction of nearer elements.
  • Benefits of elongation, without the disadvantages of friction.
  • Same protocol for all sizes.
  • Potential increment of the preload capacity.
  • Ease of verification of preload. It enables maintenance actions based on accurate preload readings.

Our SH preload system is certified by Lloyds Register.

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Guaranteed preload systems

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TSH system to guarantee 80% preload with less than 5% dispersion

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1. The base washer, lock bushing and TSH4 are introduced in the assembly.

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2. Strength transmitters are introduced through the TSH4 head.

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3. Assemble the puller on the TSH4 head.

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4. Preload is applied through the hydraulic puller and the TSH4 alongates.

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5. Adjust the lock bushing between the TSH4 head and the base washer to lock the elongation obtained and maintain the preload.

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6. Disassemble the puller and strength transmitters from the TSH4 .

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