Jack Stands: Why They're Non-Negotiable
A hydraulic floor jack can fail. Seals degrade, release valves stick, fluid leaks slowly under load. The jack was never designed to be a static support — it's a lifting tool. Jack stands are the static support. Together, they're safe. The jack alone is not.
Choosing the Right Capacity
Jack stands are rated by the pair in most cases. A "3-tonne pair" means each stand holds 3 tonnes (6 tonnes total if using both). For a typical family car (1,200–1,600kg), 2-tonne stands are sufficient. For SUVs and larger vehicles, 3-tonne stands. For trucks and vans, 6-tonne or commercial grade.
Types of Jack Stands
- Ratchet stands: Most common. Pin locks into a ratchet — quick height adjustment, secure under load.
- Pin and collar stands: Simpler mechanism. Height adjusted by pin through collar. Extremely reliable.
- Screw-style stands: Continuous height adjustment. More stable on uneven surfaces but slower to adjust.
Correct Placement
Jack stands should be placed under structural points — typically the vehicle's chassis rails, subframe mounts or axle housing. Never under plastic sills, exhaust pipes or the floor pan. Your owner's manual shows the safe lifting/support points.
FAQ
Can jack stands be used on tarmac?
Yes, but place a piece of plywood or rubber mat under each stand to prevent them sinking into hot tarmac and to improve stability.
How often should I replace jack stands?
Inspect before every use for cracks, deformation, or damaged ratchet teeth. Replace if any defect is found. Well-maintained steel stands can last decades in home use.
