Petzl Pulse temporary expansion bolt

The Petzl Pulse is a temporary expansion bolt with a diameter of 8mm. It is mainly used in the field of work at heights and in speleology. More and more climbers are also discovering its advantages when bolting a climbing route. The diameter of just 8 mm is ideal for use in lead climbing projects.

The principle of this expansion bolt is both simple and ingenious. Because above a fixed core with the cone at the end, there is a movable sheath. This has the expansion rings at the end, which provide the expansion force of the Petzl Pulse.

The movable cover can be fixed by a spring or a locking piston. Or to put it better. This fixes the expansion rings over the cone in the “clamped state”. This keeps the expansion bolt in place.

Note these four points when securing this product. Firstly, the surface must be suitably firm and compact. Secondly, you must use a drill with four cutting edges. This will give you a round hole. Thirdly, you must drill at exactly 90° to the rock surface or concrete. And fourthly, you must check the safety indicator before loading (see below or video).

Conclusion. If you always need a temporary expansion bolt, this is currently the best solution on the market!

Features Petzl Pulse temporary expansion bolt

• Manufacturer: Petzl
• temporary expansion bolt – removable
• Material: steel and aluminum
• Weight: 45 gram
• Diameter: 8mm
• Shear strength in standard concrete: 15kN
• Tear-out strength standard concrete: 12kN
• Depth drilling hole: 50mm
• Always use a 4-edged drill bit(Fischer Quattric II
• including fixed aluminum bolt hanger

Important safety instructions Petzl Pulse

A temporary expansion bolt like this requires correct installation for safe use. Therefore, we would like to give you some important instructions that must be followed.

Firstly, the Pulse only works in solid ground. This means, for example, solid concrete or compact rock. Secondly, you must use a 4-edged drill bit. Only these guarantee a round drilling hole. Thirdly, the drilling hole must be 90° to the rock surface.

Consequently, you must not wiggle around with a drill. This product is not forgiving of gross errors. Oval holes can cause the expansion bolt to fail.

And fourthly, checking the safety indicator is essential. There must be a gap between the orange safety ring and the silver fixing ring of the strap. This guarantees that the spreader elements press against the drilling hole.

If there is no gap here, your drilling hole is too large and the spreader elements will not exert any force!

Correct SDS drill bit

The Petzl Pulse requires an exactly round drilling hole. Consequently, you CANNOT use cheap, double-edged SDS drill bits. You absolutely need a four-edged drill bit. Because these have a guaranteed cutting corner dimension. Or to put it better. They make a guaranteed round drilling hole.

We recommend the Fischer Quattric II. In addition to the right drill bit, it is also important to drill a hole at least 50 mm deep. A temporary expansion bolt will of course always hold when over-drilling. However, holes that are too shallow can lead to failure!

Petzl Pulse – pay attention to redundancy

As with all security points, the same applies here. Create redundancy. This means, for example, never rappelling on a Pulse alone! As recommended by Petzl, a temporary expansion bolt should always be connected to a second one when rappelling!

The following diagram clearly illustrates the safety instructions.

Popular with developers

The Petzl Pulse is particularly popular with development climbers. Its small diameter makes it ideal for bolting from below. This means that you use very little battery energy to drill the hole for it.

Secondly, the Bolt is quick to install and lifts the body weight perfectly. Thirdly, it can be removed again. Consequently, the high purchase price is relative. This solution is much more ecological, better for the appearance and also more sustainable than installing an auxiliary bolt each time.