Description
Spherical joint socket KS 13/5 is a grease-free, flexible connection element belonging to the Rotulex system and produced from borosilicate glass 3.3. This Kugelschliff-Schale provides a reliable spherical joint interface that accommodates slight movement and misalignment without the need for joint grease, reducing contamination risk and simplifying cleaning. The KS 13/5 size matches corresponding spherical joint balls used in vacuum and pressure glassware. Offered by manufacturer Rettberg, the socket combines the chemical resistance and thermal stability of borosilicate glass 3.3 with the practical advantages of a flexible, grease-free seal. It is particularly useful in distillation trains, reaction apparatus and modular glass assemblies where repeated connection and disconnection are required. Supplied as 1 pc with a net weight of only 0,008 kg, the lightweight component is easy to handle yet robust enough for routine laboratory service. The Rotulex design supports quick assembly while maintaining a secure seal under typical laboratory vacuum conditions, making it a practical choice for research and analytical glassware systems.
This article is part of Ground-joint glassware (other), in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Joint size: KS 13/5
- Material: Borosilicate glass 3.3
- System: Rotulex
- Connection type: Grease-free, flexible
- Product type: Spherical joint socket
- Technical Information Sheet:
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Distillation & extraction glassware
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Ground-joint glassware (other)
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Questions about Spherical joint cup size 13/5, for grease-free, flexible connection
What is this article?
Spherical joint cup size 13/5, for grease-free, flexible connection is the article on this page. Luminix Health distributes Rettberg for laboratory use. It sits in Ground-joint glassware (other), inside Distillation & extraction glassware, in Labware.
This is ground-joint glassware that is not a head, a condenser or a Soxhlet: receivers, blank joints, odd adapters. A ground joint is named by the wide end and the length, such as 29/32. Mismatched joints do not seal, even with grease.
Distillation separates liquids by boiling point. A condenser turns the vapour back into liquid: Liebig, coil and cold-finger shapes differ in how much cooling surface they offer. A still head and a column sit between the flask and the condenser. A Soxhlet extractor washes a solid again and again with the same solvent. Ground joints have a standard size, and the joint, not the flask, is what has to match. The pieces are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Distillation & extraction glassware. The sub-category is Ground-joint glassware (other). The catalogue is Labware.
Shelves beside this one are Distillation heads, adapters & columns, Condensers and Soxhlet & extraction apparatus.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.