New Product

The Clarkwood Engineering Mech-Ten Mechanical Bolt Tensioning tool has been developed to provide a method of correctly tensioning studs to give reliable trouble free bolted joints.

The Mech-Ten is easy to use, flexible and provides an effective method of tensioning studs wherever it is needed and in virtually any environment.

Key to Diagram

1. Jacking nut used to stretch and tension stud (5)
2. Bridge
3. Nut
4. Row of cap screws that generate load in stud (5)
5. The stud being tensioned
6. Hardened washer
7. Tommy bar Joint
8. Gap created by stretching (tensioning) stud (5)  

Features & Benefits

• This method of mechanical bolt tensioning is safe and reliable
• No hydraulics – cost effective on initial outlay
• High quality standard, manufactured from high strength steel for long life and safety
• Protective coated for corrosive resistant
• Can be used by semi-skilled labour – (easy to use)
• Powerful bolted joint with high clamping force
• Low torque requirements - multiple summation of tension from a pitch circle of small sized capscrews (well Proven Method)
• Safe method of assembly (no high pressure hydraulics)
• Tightens stud in pure tension (no torsional strain)
• No thread gallingCompact design
• Protects the environment (no electric power required)
• Quality controlled to ISO 9001: 2008 / ISO 14001:2004

After tensioning the Mechanical Bolt Tensioner (Mech-Ten) can be removed leaving only the Nut Item (3) and Stud Item (5) so the Mech-Ten can be used to tension other studs.

Simple to Use

• Screw Stud (5) into Joint
• Screw Nut (3) onto Stud (5)Fit Bridge (2)
• Fit Hardened Washer (6)
• Screw Jacking Nut onto the Stud (5)
• Select Hand Operated Torque Wrench and set to half the final torque setting
• Sequence Star method of tightening capscrews to uniform bolted joint tightening.
• Tommy Bar (7), Nut (3) to Take up gap
• Set final torque setting and follow the same sequence to apply the tensile tension into Stud (5)
• Tommy Bar (7), Nut (3) to Take up gap
• Reverse sequence of untightening capscrews to remove load
• Remove Jacking Nut (1)
• Remove Bridge (2)

It should be noted that with all types of tensioners there is a loss of tension in the studs when the tensioner is removed due to embedment settlement in the joint. This loss can be predicted and depending on the characteristics of the joint can be advised by Clarkwood Engineering.