Simply put oiled torsion.
Oil tempered garage door spring.
Therefore oil tempered springs remain the most ubiquitous type of torsion spring for the following reasons.
Oil tempered springs for both garage door.
Oil tempered springs commonly referred as the classic make this type of garage door spings have been with us for years and are the most common types of springs.
Well to give you an idea about these two types of garage door springs here is oil tempered versus zinc galvanized torsion spring.
Oil tempered torsion springs offer several unique advantages.
Oil tempered springs are then heat treated with a series of heating and cooling phases using hot oil so that they can adequately handle the infrequent stress applications applied to them whenever the door is opened or closed.
The difference is that class ii has higher tensile ranges than class i in the same wire size.
Many garage door manufacturers offer this type of spring.
Their name derives from the way they are made.
After the heating process the oil is slowly cooled to temper the metal.
What they are and their pros and cons.
The vast majority of garage doors that rely on torsion springs use oil tempered torsion springs by default largely due to their cost and abundant availability.
The wire which is used to make the spring is heated quenched in oil and then heated again.
Oil tempered torsion springs are what we call the classic make for garage doors.
The foremost reason that so many prefer oil tempered springs is durability.
Oil tempered wire mechanical springs and garage door springs are often called upon to do serious heavy lifting.
Oil tempered springs have been around for a very long time and they are the most common springs on a garage door.
These springs however have one downfall.
First the spring is brought to a high temperature before being quenched in an oil bath.
Class i and class ii.
Historically the garage door industry used torsion springs made of oil tempered wire that conformed to astm 229 standards which detail among other things tensile strength ranges by wire size.
Oil tempered garage door springs undergo a unique process to increase their tensile strength without introducing brittleness into the metal.
The spring wires heat and then bathe in hot oil.
This wire falls into two categories.
High durability oil tempered torsion springs are well known for their exceptional durability.
Still these springs are nice because they keep their tension and rarely ever need to be tightened.
They have been on the market for a very long time and are the torsion springs most garage doors utilize.