WHAT’S A ‘DOUBLER PLATE’?

A ‘doubler plate’ is an approved off-the-shelf mounting-plate system that allows seat-belt anchorages to be secured to sheet-metal parts of a vehicle. There are specific requirements for the plate’s thickness and minimum sizes they must meet (all outlined in the LVV Seatbelt Anchorages Standard). The flat plate sits inside the vehicle, while the section with the nut sits under the vehicle, and both sections are riveted together using Monel rivets or bolted using 5mm bolts. Doubler plates must not be welded to the body due to the effect welding heat can have on the strength of sheet metal. Doubler plates can be purchased through seat-belt specialist businesses, some compliance centres, and some chain partssupply stores for around $10–$15 per pair.