Laboratory Jack

Quick Answer: The Laboratory Jack is a scissor-lift platform used to raise and lower apparatus on the bench: turning the knob moves the top plate up or down while it stays level. It is used under heating mantles, water baths, stirrers and receiving flasks so their height can be set and changed quickly.

Why a Lab Jack Makes Heating Safer

The main safety reason for a lab jack is removing heat quickly. A flask clamped under an Allihn condenser above a heating mantle can be taken off the heat by lowering the jack, without unclamping hot glass. The same applies to an oil or water bath: when a reflux boils too hard, dropping the bath away from the flask stops the heating at once.

The listing photograph shows the familiar scissor design, with crossed arms between a base plate and a top platform, and a threaded rod turned by a knob at the side. The screw holds any height without a separate lock, so fine positioning is simple. The title does not give the platform size, height range, load rating or material, all of which should be matched to the heaviest item you plan to lift.

Jacks are also used for alignment: raising a receiving flask to meet a distillation adapter, lifting a beaker under a burette tip, or setting an optical component to the height of a light beam in physics.

Specifications

Care & Handling

• Stand the laboratory jack on a flat, stable bench and centre loads on the platform.
• Stay within the load rating; an overloaded scissor mechanism can collapse suddenly.
• Wipe spills from the threaded rod and pivots, which seize if salts or acids dry on them.
• Never use the jack to force glassware into a joint; it can apply enough force to crack glass.

Applications

• Lowering a heating mantle or bath away from a reaction flask in an emergency
• Raising a receiving flask to meet the adapter in a distillation
• Setting a magnetic stirrer at the right height under a titration beaker
• Aligning lenses, lamps and screens at one height on an optics bench

Why Choose LabEquip

Organic and analytical labs usually keep a jack under every heating set-up, and physics labs use them for optical alignment. LabEquip lists this jack in the General Lab Products range; tell us the platform size and load you need.

Frequently Asked Questions

What is a laboratory jack used for?

It holds apparatus on a platform whose height can be adjusted. It is mostly used under heat sources, so heating can be removed by lowering the jack, and for setting flasks or instruments at exactly the right height.

Why lower the heat source instead of raising the flask?

The flask is connected to condensers and joints and is clamped in place, so moving it risks breaking the assembly. Lowering the mantle or bath takes the heat away without disturbing any glassware.

How much weight can a lab jack carry?

That depends on the size and construction of the jack, and the title does not give a rating. Check the rating against the heaviest item, such as a full oil bath, before use.

Does the platform stay level?

In a scissor jack the crossed arms move together, so the top plate stays parallel to the base throughout its travel, provided the load is centred.

Can a lab jack be used inside a fume cupboard?

Yes, and it is common there under reflux and distillation set-ups. Keep the threaded rod clean, since corrosive vapours in a fume cupboard attack exposed metal.

What if the jack is stiff to turn?

Clean the threaded rod and pivots, remove any crystals and apply a little light lubricant. Stiffness under load can also be a sign that the jack is overloaded.

Last Updated: September 2026