Burette Clamp, Extention, Double Keys 2

Quick Answer: The Burette Clamp, Extention, Double Keys 2 is a double key burette clamp with two knob screws. The listing photograph shows a compact head with orange plastic jaws and blue knobs on a short metal rod, which fits a boss head and holds a burette or narrow tube upright.

A Compact Double Keys Pattern

Unlike the long-armed Double Keys 1, the Double Keys 2 photograph shows a short, compact head. The jaws are moulded orange plastic and two blue knob screws sit on the body, which is what the name ‘double keys’ refers to. The photograph alone does not show exactly how each screw acts on the jaws, so buyers who need fully independent jaw movement should confirm the mechanism before ordering.

Plastic jaws have practical advantages at a titration bench. They do not corrode when acid drips from a burette tip, they have no coating that can peel, and they are gentle on glass. They are less suited to heat, so this clamp belongs on cold work such as titration and dispensing, not on flasks over a burner.

The listing name says ‘Extention’ although the photographed rod is short; rod length is not stated, so check it against how far the burette must reach from the stand.

Care & Handling

• Keep the plastic jaws away from burners, hot plates and heating mantles.
• Rinse acid or alkali drips off with water; trapped crystals make the jaws slip.
• Turn the knob screws of the double key burette clamp by hand only; overtightening can crack a moulded jaw.
• Check the rod length before fitting it to stands with wide bases or stirrer plates.

Applications

• Student titration stations where acid drips would corrode bare metal jaws
• Holding plastic burettes or dispensing tubes that should not be gripped by metal
• Holding a narrow glass column upright in a cold separation procedure

Specifications

Why Choose LabEquip

Schools wanting corrosion-free burette holders for routine titration benches are the usual buyers of plastic-jawed clamps. LabEquip lists the Double Keys 2 in its General Lab Products range; contact us to check jaw range and rod length against your burettes.

Frequently Asked Questions

What is the difference between Double Keys 1 and Double Keys 2?

The photographs show two different designs: number 1 has a blue metal body, black-tipped prongs and a long rod, while number 2 has a compact head with orange plastic jaws and a short rod. Both are described as double keys, meaning two adjusting screws.

Are plastic jaws strong enough for a glass burette?

For holding a burette upright, yes, as the load is small. Plastic jaws should not carry heavy flasks or hot apparatus; coated metal jaws are the better choice there.

Do plastic jaws resist acids?

Most moulded plastics used for lab fittings are unaffected by dilute acids and alkalis at room temperature. Organic solvents are a different matter, so rinse off any solvent spill promptly.

Can this clamp be used near a Bunsen burner?

Keep it away from flames and hot surfaces. Plastic jaws soften or deform with heat, so use a metal clamp for anything being heated.

Does the clamp need a boss head?

Yes. The short rod goes into a boss head fixed to the retort stand upright, and the boss head sets the height.

How should the two knob screws be tightened?

Turn them by hand, a little at a time, until the burette is held without wobbling. Stop there, because forcing a plastic jaw closed can crack it.

Last Updated: September 2026