The ITH ISO 9001 quality accreditation specifies that the steel bar raw material needs to be heat treated, tested by ultrasound and being supplied by a renowned steel manufacturer having the according accreditation for the respective steel quality themselves.

To avoid mix-ups, every single steel bar is being tested by a spectrum analysis before being placed into the designated stock area..

According to customers requirements we offer the availability to have all safety bolt items individually tested and certified by one of the following companies:

• American Bureau of Shipping (ABS)
  
• Germanische Lloyd
  
• Bureau Veritas
  
• Noske Veritas
  
• TÜV

Threads up to M180 (7 1/8") are made using the cold-rolling process, thereby achieving optimum surface qualities and high strengths.

Depending on dimension on material used the cold-rolling process is done in a continuous-flow or parting process. The cold-rolling solidifies the thread base more or less harder. The yield strength of the pin material within the edgenear range of thread flank and core roundness is thereby increased. At the same time the internal pressure is built up, overlaying later with the tensions and creating at total state of pressure that has a positive effect on the durability of the bolts.

The materials listed below are only a representative sample of the range of materials processed by ITH. All other materials can be processed after consultation with ITH.