10" Stroke For Drafting Chair, Bar Stool, Counter Height Stools Is your gas rod safe? Why do we have to choose Mcdoofly Class 3 gas lift cylinder? Because they pass the US BIFMA X5.1 test and the European German machinery DIN4550class-3(referred to as grade 3 gas rod) test. The required safety factors include the hardness thickness of alloy steel, pure nitrogen explosion-proof gas rod with 2.0 thickness of inner pipe wall, pressure value and pressure category, explosion-proof index and other 48 tests. We hope you understand the importance of gas rod on a chair. It is very important to choose a gas rod with excellent quality and passing the safety tests. Mcdoofly Hydraulic lifting cylinder has a Long-term service life.
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