What is the tolerance threshold under the EU-Mexico?

The general tolerance is 10% of the ex-works value of the finished product.

EU-Mexico - HS 58

EU-Mexico Global Agreement (FTA part)

12 RegelnToleranz: 10%2000

5801Woven pile fabrics and chenille fabrics, other than fabrics of heading No 5802 or 5806 ▸ Combined with rubber thread

Manufacture from single yarn. For special conditions relating to products made of a mixture of textile materials, see introductory note 5.