Jack stands are the only thing keeping a raised vehicle from crushing you while you work underneath it. Unlike hydraulic jacks, which rely on fluid pressure that can bleed off, jack stands use a solid mechanical pin or ratchet bar to lock the support columns at a specific height. They are sold in pairs and rated by their weight capacity, typically ranging from 2 tons to 12 tons. Set them on flat, solid concrete, and gently shake the vehicle after lowering it onto the stands to ensure everything is stable before crawling under.
Mechanic Glossary
Jack Stand
A mechanical support stand used to hold a vehicle in the air after it has been lifted with a jack.
Frequently Asked Questions
Most manufacturers rate jack stands by the pair. A set of 3-ton stands means the pair can support a total of 3 tons, not 3 tons each.
No. Wood can split, slip, or crush under the heavy weight of a vehicle. Only use the metal saddle of the jack stand directly against the vehicle's frame.
Inspect them for bent metal, cracked welds, or worn teeth on the ratchet bar. If you find any damage or deep rust, discard them immediately.