ISOFIX Lower Anchorages

ISOFIX Lower Anchors

ISOFIX is the international standard for attachment points for safety seat or formally called child restraint system (CRS) in vehicles, enabling compliant child restraint system (CRS) to be quickly and safely secured. The ISOFIX system was developed jointly by child safety seat maker Britax-Römer and automobile maker Volkswagen, with the first compatible products released in 1997. Under the current UNECE R14, all new vehicles produced since February 2013 are required to have ISOFIX lower anchorages and top tether attachments.

ISOFIX is an alternative to securing the CRS without the use of the vehicle seat belt system. ISOFIX CRS requires three anchorage points. Seats are secured with TWO attachments at the base of each side of the seat known as lower anchorages and ONE attachment at the top called the top tether. ISOFIX CRS also may come in a combination of two lower connectors and one support/load leg.

Choices of installation for ISOFIX CRS.

ISOFIX lower anchors are the small metal bars located in the vehicle seat bight where the upper and lower cushions meet. The ISOFIX connectors on the CRS (the two “alligator-like” clips) connect the safety seat to the lower anchors.

Some ISOFIX lower anchors can be easily seen while some may have the anchors under a removable cover. Whichever way they are designed, it should be labeled with an ISOFIX word or logo as an aid in finding the ISOFIX lower anchors. Each of the metal bars will have a standard length of 25 mm with a maximum gap of 255 mm from each other.

The best way to look for the lower anchorages is by first checking the vehicle owner’s manual.


  1. History & Heritage. (n.d.). Retrieved August 14, 2018, from
  2. US9616782B2 – Car Seat Vehicle Connection System, Apparatus, and Method. (n.d.). Retrieved August 14, 2018, from
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