Investigation of a visible surface mark on the head of the ASAP LOCK screw
February 12 2015
Rope access and confined space
At the end of 2014, a screw with a visible mark that appeared to be a crack was reported to us.
Actions Taken for Investigation
- Petzl sent samples of these screws to a metallurgic laboratory.
- Petzl investigated the potential causes with its screw supplier.
- Petzl tested the screw with excessive torque, which stripped the screw, while the head remained intact.
Conclusions of the Investigation
- This visible mark on the head of the screw is the result of the manufacturing process. It is a surface defect of the screw head that does not affect its performance (see attached images in Annex).
- This mark does not occur during use; it does not come about depending on usage conditions. It is important to note that this mark is superficial and is the result of manufacturing process.
Decisions and Customer Satisfaction
- Petzl immediately initiated corrective action and instituted visual inspection of 100% of screw heads on the assembly line to ensure all new screws are unmarked. All products on the market are now supplied with a screw devoid of any marks.
- The Petzl supplier has also added unit-by-unit visual inspection to its manufacturing process.
- Petzl accepts that this mark may add confusion to inspection, but there is no risk for end users' safety. If a customer finds a screw with a mark and is concerned, Petzl can send spare screws on request. Please contact your country’s after sales service for the replacements: contact form