Sectional Garage Door steel Rollers

Product introduction OF best garage door rollers

The spring stiffness is the ratio of unit working load (the total weight of the door g) to the total degree of torsion (the click degree of the door f).

The spring is deformed for a long time

The spring is pre twisted once, the spring is twisted to the corresponding degree of PS for 10 minutes, and then the deformation of the spring degree is measured after three times of continuous torsion with the same load. The difference between the two measurement results should not be greater than 1.0% of the total torsion degree.

Safety fatigue life test of spring

1. After 20000 times of fatigue test, the spring should not break, the load loss after the test should not be greater than 1.5% of the working load, and the torsion degree loss should not exceed 1.0% of the total torsion degree of the electric garage door in Tianjin Hexi District.

FAQ

1.Is sample available?is it free?

Answer:Sample test is usually neccessary for our products,while our sample is usually high costs and need to charge sample fee;

But some long term agency or sole agency can have better sample test conditions,please check with your related salesman;

2.Do you support OEM?

Answer:Yes,we support OEM,customer can print on their logo in goods and packing carton;But OEM will requires order quantity;