Raumer expansion bolt 8x72mm AISI 316L 2 expansion links

The Raumer expansion bolt 8x72mm is made of AISI 316L steel. It is a expansion bolt from Raumer Climbing especially for speleology.

Firstly, its diameter is only 8mm. The length is 78mm. Secondly, the bolt has 2 expansion links. This allows “gripping” or “donning” in many different types of rock. This is what makes this expansion bolt so extremely reliable! Thirdly, it has a very long service life due to its high steel quality. Fourthly, it has a super price-performance ratio.

In short: really perfect for caving!

Features Raumer expansion bolt 8x72mm

• Material: Aisi 316L steel
• Diameter 8mm
• Length: 78mm
• Expansion links: 2
• Weight: 33 gram
• Recommended torque: 20 Nm
• Ideal for many types of stone thanks to the 2 expansion links

Note: expansion bolt do not hold well in very soft rocks such as sandstone. We therefore recommend working with adhesive hooks in this type of rock!

For two expansion bolt securing points next to each other, observe the minimum distance (tear-out cone!). For this expansion bolt it is 24 cm! This means 3 x the setting depth.

More information: Installation instructions Raumer expansion bolt

Use the right drill bits

Especially with very thin bolts such as the Raumer expansion bolt 8x72mm, choosing the right SDS drill bit is crucial. We clearly recommend products with a PGM test mark. Cheap drill bits do not guarantee the cutting corner dimension. This can lead to problems when hammering in the bolts. Or the opposite may happen. The drilling holes “wear out”. The expansion bolt can then start to move or the lugs can become loose. A good choice is, for example, the Fischer Quattric SDS drill bit.

Matching bolt hanger Raumer expansion bolt 8x72mm

We recommend the Vertical Evolution bolt hanger made of AISI 316L steel. This latch is not only high quality, it also has the exact material properties. In other words, AISI 316L steel. As a result, this product prevents galvanic corrosion.

If you are more interested in this topic, read our technical article“Steel quality at expansion bolt and glue in bolt“. Or attend one of the workshops and drilling courses at the bolting.eu Academy.

Matching accessories

For the Raumer expansion bolt 8x72mm, we recommend cleaning the drill hole with a Fischer hole brush and a drilling hole blow out pumb. These are two small but important accessories. On the one hand, they help to protect the bolt against “wandering”. On the other hand, they are also useful for the bolters or developers. This means less air gets into your lungs.

Link tip: Association of Austrian Speleologists