There are two indicators to indicate tie down straps overall strength.
The first one is lashing capacity (abb. LC, also called working load), which describes the maximum weight that a tie-down can support with regular day-to-day use without becoming damaged.
The second is breaking force (normal called capacity, max capacity, breaking strength or breaking load), which describes the maximum comfortable weight that can be supported before the strap fails.
According to the definition of the EN12195-2，lashing capacity is generally calculated as one half of the breaking force. Some people think that max capacity should be 3 times LC. But that is not correct. 3 times LC for breacking load is only for the webbing itself, NOT for the tie downs with ratchet/buckle and hooks.
The standard EN12195-2 provides method on how to conduct breaking force test. Contact firstname.lastname@example.org if you don’t have standard EN12195-2 on hand.
Some customers evaluate the tie down straps rating from the material, width and thickness of the webbing. It is wrong because normally the strength of a tie down strap is NOT limited by webbing, that is limited by fastened hardware.
- A Tie Down Strap with GS certification is good for you to select. The GS certification can prove that the Tie Down Strap is produced in accordance with industry standard EN12195-2:2000.
- A tensile testing equipment on production spot is absolutely helpful for quality control. Remember to ask your supplier if they have one in factory.