1. Insertion force, Removal force (Drawing force)
- The force required to fully insert or extract a pair of connectors without coupling or operating similar devices.
2. Insertion and removal durability
- The number of times of insertion and removal guaranteed. It is also called insertion and removal frequency. Normally, it is determined according to contact pressure and plating.
Omron considers that environmental resistance performance is important in terms of contact reliability of connectors, and the specifications of insertion and removal tolerance are determined by how many times insertion and removal are conducted until nickel base plating of poorer environmental resistance is exposed.
Reference: Basic thickness of gold plating and number of times of insertion and removal (In some models this may not apply)
- 0.15μm : 50 times
- 0.4μm : 200 times
- 0.76μm : 400 times
Nickel base plating starts to be exposed due to friction of a gold plating on the surface of the contact by insertion and removal. However, it is possible to insert and remove quite a lot more than the guaranteed number before a base material(primarily copper alloy) is exposed since nickel is harder than gold and excellent in abrasion resistance, and the plating thickness is also considerably thicker than gold. Therefore, if it is just inserted and withdrawn, the contact resistance is low and stable even when the nickel base plating is exposed, and in terms of the contact resistance value, it can be said that there is no problem when considering only contact resistance value.
However, when using the contact of this condition under an adverse environment, contact resistance increases and becomes unstable due to corrosion of nickel. In consideration of this, Omron determines the number of times of insertion and removal based on friction condition of gold plating, and we recommend exchanging for those exceeding that number.