Standard Clamp Retort, Four Pronged, Pressure Die Cast, Zinc

Quick Answer: The Standard Clamp Retort, Four Pronged, Pressure Die Cast, Zinc is a zinc die cast clamp with two opposed jaws, each carrying a pair of curved fingers, closed by a thumbscrew and mounted on a straight rod. The listing photograph shows a gold-toned finish; it holds round vessels on a retort stand through a boss head.

Why Zinc for a Clamp Body

Zinc alloys are among the metals most widely used for pressure die casting, because they flow well into a die and fill thin sections and fine detail at a relatively low casting temperature. A clamp body cast in zinc can have slender fingers and a neat screw boss while staying strong for its size. Zinc alloy is also much denser than aluminium, so the same clamp is heavier and feels more solid in the hand.

That weight has a practical side. On a stand with a heavy cast iron base, a solid zinc clamp holding a full flask is no problem. On a light plastic or sheet base, the extra mass at the end of a long rod adds leverage, so keep the reach short. Where lightness matters more, the aluminium four prong clamp has the same four-finger layout.

Zinc alloys soften at far lower temperatures than iron or steel and are attacked by acids and alkalis, so this clamp belongs above the heat and away from spills. The title does not describe the finish, which appears gold-toned in the photograph.

Care & Handling

• Keep the zinc die cast clamp well above flames and hot plates; zinc alloys lose strength when hot.
• Wipe off acid and alkali splashes straight away and rinse with water.
• Store it dry; damp storage can leave a white bloom on exposed zinc.

Specifications

Applications

• Holding a filtering flask by its neck so vacuum tubing cannot pull it over
• Gripping a reagent bottle or measuring cylinder upright while it is filled
• Clamping a conical flask for a gas collection set-up
• Supporting wide tubes or small columns in college practicals

Why Choose LabEquip

Buyers who want hardware with a solid, weighty feel for daily student use often pick zinc castings. LabEquip lists this clamp with its aluminium counterpart in General Lab Products; send your quantities through the contact page.

Frequently Asked Questions

Why is zinc used for die cast clamps?

Zinc alloys cast well into thin sections and fine detail at comparatively low temperatures, producing strong, consistent parts. The result is a compact clamp body with slim fingers.

Is the zinc clamp heavier than the aluminium one?

Yes. Zinc alloy is more than twice as dense as aluminium, so a clamp of the same shape weighs considerably more. Use it on a heavy base, or keep the reach short on a light stand.

Can it be used near a Bunsen burner?

Keep it above the heated zone. Zinc alloys soften at much lower temperatures than steel, so the clamp should never sit in or just above the flame.

What causes white deposits on zinc?

Zinc forms a white corrosion product, often called white rust, in damp conditions. Store clamps dry and wipe off condensation or spills.

How do four prongs hold a filtering flask?

The two pairs of fingers close around the neck from opposite sides and centre it. Tighten until the flask cannot turn when the vacuum tubing is moved, and no further.

Should bare fingers touch glass?

Bare metal fingers can scratch or chip glass under pressure. If the fingers of your clamp are uncovered, slip short lengths of rubber or silicone tubing over them before holding glassware.

Last Updated: September 2026