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Coaxial Inserts for NMR Sample Tubes
A coaxial insert consists of an upper glass alignment tube with a precise outer diameter that fits very closely within the matching 5mm or 10mm thin wall outer glass NMR tube, ensuring accurate coaxiality and centering of the insert within the outer NMR tube. The lower glass stem tube, of a smaller diameter, typically holds an external lock or reference material. The smaller diameter stem tube is precision sealed to the upper alignment tube using a highly accurate, state-of-the-art glass working lathe, maintaining the coaxial alignment necessary for the acquisition of high quality spectra. The accompanying table presents the most commonly used sizes for Bruker and Varian probes. Please note that the last two inserts listed in the table are constructed from quartz glass, whereas the remaining inserts are made from low expansion borosilicate glass (Pyrex® or equivalent ASTM Type 1 Class A glass).

The data in the columns under “Stem Specifications” lists the stem tube outer diameter, length and the volumetric capacity of the stem tube when the entire length is filled (either 50mm or 60mm). The last column of the table gives the volumetric sample capacity remaining within the outer 5mm or 10mm NMR tube when the coaxial insert is positioned to full depth within the outer tube, as measured to the top of the insert stem tube (again either 50mm or 60mm). All inserts are made to an overall length of 206mm (8-1/8”), and include a cap for the insert tube along with a special cap to seal the insert to the top of the outer NMR tube. As always, we would be delighted to quote on custom requests for stem diameters and lengths not given in the accompanying table. (5mm & 10mm) for external lock & reference solvents. Precision inner cell for use with 5mm & 10mm thin wall NMR tubes. Available for Bruker & Varian spectrometers. *10mm insert for Bruker & Varian includes our 1008-UP 7” NMR tube
Name / Number Tube Type Stem Length Capacity Sample Capacity Basket
NI5CCI-B Tube 5mm Bruker Stem Specification - 2mm O.D Stem Specification - Length 50mm Stem Specification - Capacity 100 (µl) Sample Capacity 490µL
NI5CCI-V Tube 5mm Probe Varian Stem Specification - 2mm O.D Stem Specification - Length 60mm Stem Specification - Capacity 120 (µl) Sample Capacity 590µL
NI10CCI-B* Tube 10mm Probe Bruker Stem Specification - 3mm O.D Stem Specification - Length 50mm Stem Specification - Capacity 215 (µl) Sample Capacity 2.61ml
NI10CCI-V* Tube 10mm Probe Varian Stem Specification - 3mm O.D Stem Specification - Length 60mm Stem Specification - Capacity 260 (µl) Sample Capacity 3.14ml
NI5CCI-B-QTZ Tube 5mm Probe Bruker Stem Specification - 3mm O.D Stem Specification - Length 50mm Stem Specification - Capacity 175 (µl) Sample Capacity 285µL
NI5CCI-V-QTZ Tube 5mm Probe Varian Stem Specification - 3mm O.D Stem Specification - Length 60mm Stem Specification - Capacity 210 (µl) Sample Capacity 340µL


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