Guardian 5000 special nester clamp CLS-NESTXS

Quick Answer: The Guardian 5000 Special Nester Clamp CLS-NESTXS is a rod-mounted clamp with an adjustable screw band and a chain, used to hold glassware that ordinary clamps grip badly, such as columns, odd-shaped flasks and funnels, above or on a Guardian 5000 hotplate or stirrer.

What Makes This Clamp Different

Standard three-finger clamps work well on straight cylinders of the right size but struggle with tapered, bulbous or unusually large glassware. The special nester clamp CLS-NESTXS takes a different approach. The listing photograph shows a metal rod with a flat plate at one end, a screw-tightened metal band like a hose clip, and a length of chain. The band can be tightened around a cylindrical section, while the chain wraps around shapes the band cannot follow.

The word “nester” suggests the item nests around whatever shape it holds, and the XS ending of the listed code usually indicates the smallest size in a range, which the photograph supports: the band is relatively short. The exact grip range is not stated in the listing.

Compared with the Guardian 5000 column special clamp, which uses a single stainless band for long straight columns, the nester clamp combines band and chain for glassware with changing diameters. Both mount on the upright rod of the Guardian clamp system.

Applications

• Holding a separatory funnel or tapered vessel over a stirred receiver
• Supporting a short distillation column with a changing outer profile
• Securing an odd-shaped reaction vessel on a Guardian hotplate stirrer
• Holding a Dewar-style or jacketed vessel that standard clamps cannot grip

Specifications

Care & Handling

• Tighten the band screw gradually and stop once the glass is held; overtightening can crack glass
• Place a thin rubber sleeve or cloth between band and glass for delicate items
• Keep the chain and band clear of the heated plate
• Rinse off corrosive spills promptly and dry the screw mechanism

Why Choose LabEquip

Research and teaching labs order the nester clamp when they need to hold glassware that normal clamps cannot grip on a Guardian 5000 set-up. LabEquip can confirm the grip range and supply it with the rod and other clamps from our general lab products range; contact us with the glassware you need to hold.

Frequently Asked Questions

What is a nester clamp?

It is a clamp that adapts to the shape of the item it holds. This one combines a screw-tightened band with a chain, so it can grip tapered, bulbous or irregular glassware.

What does XS in CLS-NESTXS mean?

XS normally marks the smallest size in a clamp range, and the short band in the photograph fits that reading. Ask us for the exact grip range before ordering.

How is it different from the column special clamp?

The column clamp uses a single stainless band suited to straight columns. The nester clamp adds a chain for items whose diameter changes along their length.

Can it hold heavy glassware?

It can hold typical lab glassware steadily, but heavy vessels should also be supported from below. Keep the clamp low on the rod to reduce leverage.

Will the metal band damage glass?

Not if it is tightened gently. For thin or precious glassware, put a rubber sleeve or cloth under the band to spread the pressure.

Which rod does the clamp fit?

It is designed for the upright rod of the Guardian 5000 clamp system. Using it on other rods may give a loose fit.

Last Updated: September 2026