Two-post lift terms explained
In short
2 Post Lifts defines 16 terms that appear on product listings and in manufacturer documentation for two-post automotive lifts.
Each definition below is one sentence first, then what it means when you are buying.
Frame and floor
- Clear-floor lift
A clear-floor two-post routes its equalisation cable through the overhead assembly rather than across the ground, so nothing crosses the floor between the columns.
Nothing to drive over or trip on. Needs more ceiling height than a floor-plate design to fit the overhead crossbar.
- Floor-plate lift
A floor-plate two-post runs its equalisation cable through a channel across the floor instead of overhead.
Buys back roughly a foot of ceiling height compared with clear-floor. You drive over the plate, and it is a minor trip hazard.
- Asymmetric arms
Asymmetric (offset) two-post arms are unequal in length, positioning the vehicle forward of the columns' centreline once raised.
The geometry to choose if you need to walk past a raised vehicle or get in and out of it while it is up.
- Symmetric arms
Symmetric two-post arms are equal in length, centring the vehicle between the columns.
Loads both columns evenly, which suits trucks and vans with a long wheelbase. Door and walk-through clearance is worse than asymmetric.
- Drive-through clearance
Drive-through clearance is the width between a two-post lift's columns at their narrowest point.
The number that decides whether a wide vehicle — a dually, a van — can get in between the posts at all. Check it before the capacity rating.
Mechanism
- Power unit
The power unit is the motor and hydraulic pump assembly that drives the lift's cylinders.
Its voltage decides your electrical bill. 208-230V single-phase is a dedicated circuit, not a garage outlet you already have.
- Equalisation cable
An equalisation cable synchronises the two carriages of a two-post lift so both sides rise and fall together.
It does not hold the vehicle up on its own — that is the mechanical lock. Cables stretch over time and need periodic adjustment.
- Lock ladder
The lock ladder is the toothed rail inside each column that the mechanical safety locks engage against at fixed heights.
Raise until the locks engage audibly on both columns, then lower onto them before working underneath. Every time, no exceptions.
- Single-point lock release
A single-point lock release disengages the mechanical locks on both columns from one lever, rather than requiring two people or two separate releases.
The common arrangement on a modern two-post and worth checking for on an older or budget model that may lack it.
- Pinch-weld puck
A pinch-weld puck (or adapter) is a shaped rubber pad that sits on a unibody vehicle's reinforced seam without crushing it.
Using the wrong pad on a unibody car bends the sill. Most lifts ship with a basic set; low or wide vehicles often need taller ones separately.
Building requirements
- Required ceiling height
Required ceiling height is the manufacturer's stated minimum clearance from the floor to the lowest obstruction with the lift's overhead assembly and a vehicle raised to full height.
The single figure that decides whether a given two-post model is even possible in your building. Almost never stated on a listing — we carry it where the manufacturer publishes it.
- Concrete compressive strength
Compressive strength, given in psi, is the load a slab can bear before it fails, stated as a minimum for every anchored lift.
Thickness alone does not answer this. A thick but weak slab can still fail under anchor load.
- Anchor embedment
Anchor embedment is the depth an anchor bolt must be set into concrete to reach its rated holding capacity.
Stated in the installation manual. An anchor that spins instead of tightening has not set — torquing harder makes it worse, not better.
Standards and freight
- ALI certification
ALI certification is third-party testing of one specific lift model, at one specific capacity, against the ANSI/ALI ALCTV standard, with ongoing audit of production.
It attaches to a model at a capacity, never to a brand as a whole. Check the ALI directory entry for your exact model.
- Freight class
Freight class is the NMFC category an LTL carrier uses to price a shipment, set by the crate's dimensions and weight.
Every model on this site ships freight, never parcel — the smallest still crates at several hundred pounds.
- Liftgate delivery
Liftgate delivery is an LTL service where the truck carries a powered platform to lower the pallet to ground level.
Without a loading dock or forklift you need this, and at a residential address that is nearly always the case.