Hello, safety belts should belong to category 22

Cables, ropes, nets, tents, awnings, waterproof tarpaulins, sails, bags and bags (not belonging to other categories) etc.); padding and filling materials (other than rubber or plastic); fiber raw materials for textiles.

Class 22 mainly includes ropes and sail products, padding and filling materials, and fiber raw materials for textiles.

This class includes in particular:

—Cables and ropes made of natural or artificial textile fibres, paper or plastics.

In particular, this class does not include:

—certain nets, bags and bags (consult the alphabetical list of goods);

— Musical instrument strings (Class 15).

If detailed information is given, a more detailed answer can be given.