The Enerpac GT2LCB is the load cell and bridge for the GT2 topside hydraulic bolt tensioner, rated 45.1 tons at 21,750 psi for M30 to M39 and 1-1/8 to 1-1/2 in bolts. It is one half of the tensioner: pair it with one GT2 adaptor kit sized to your bolt thread.
GT2LCB specifications
| Maximum load | 45.1 ton |
|---|---|
| Maximum operating pressure | 21,750 psi (1,500 bar) |
| Cylinder effective area | 4.15 in² |
| Stroke | 0.39 in |
| Bolt range | M30 to M39, 1-1/8 to 1-1/2 in |
| Weight (load cell and bridge) | 9.0 lb |
| Included | Load cell, bridge, tommy bar |
Data from the Enerpac E330 Industrial Tools catalog (GT-Series Topside Bolt Tensioners).
What you need with the GT2LCB
1. One GT2 adaptor kit (puller sleeve and captive socket) for your thread. Enerpac's own ordering example for an M36 x 4 bolt is one GT2-LCB plus one GT2PM-NRS03640.
| Adaptor kit | Thread | Minimum stud protrusion |
|---|---|---|
| GT2PM-NRS03035 | M30 x 3.5 | 2.9 in |
| GT2PM-NRS03335 | M33 x 3.5 | 3.0 in |
| GT2PM-NRS03640 | M36 x 4 | 3.1 in |
| GT2PM-NRS03940 | M39 x 4 | 3.2 in |
| GT2P-NRS1125U08 | 1-1/8"-8 UN | 2.9 in |
| GT2P-NRS1250U08 | 1-1/4"-8 UN | 3.0 in |
| GT2P-NRS1375U08 | 1-3/8"-8 UN | 3.1 in |
| GT2P-NRS1500U08 | 1-1/2"-8 UN | 3.2 in |
2. A 21,750 psi tensioning pump: the HPT1500 hand pump, the air-driven ATP1500, or a ZUTP electric pump such as the ZUTP1500B. Standard 10,000 psi pumps cannot be used.
3. 21,750 psi tensioner hoses such as the HT1503 or HT1510. Twin ports let several tensioners be linked to tighten bolts at the same time.
Features
- Bridge detaches and rotates for easier positioning.
- Full bridge window for access to the socket; captive socket cannot fall.
- Piston stroke indicator.
- Black surface treatment against corrosion and an anti-slip grip.
- Complies with Machinery Directive 2006/42/EC, ASME B30.1, EN-ISO 4413 and EN-ISO 12100.
Questions
Is the GT2LCB a complete bolt tensioner?
No. It is the load cell and bridge. A working GT2 tensioner is the GT2LCB plus one GT2 adaptor kit for the bolt thread.
What is the difference between bolt tensioning and torquing?
A tensioner stretches the bolt directly with hydraulic pressure, then the nut is run down by hand with the tommy bar. There is no friction from the threads, so bolt load is more consistent than with a torque wrench, and several bolts can be tensioned at once.
Can I use a 10,000 psi pump?
No. GT-Series tensioners operate at up to 21,750 psi and need a tensioning pump and hoses rated for that pressure.