Ground Joints specialist

Lenz — The Specialist for Ground Joints
The Lenz® range of ground joint instrumentsWith decades of experience, advanced technological know-how and the outstanding properties of DURAN® glass we guarantee the proven quality of our precision ground joints.
The Lenz® range of ground joint instruments includes conical joints, stopcocks, ground joint flasks, separating and dropping funnels as well as a large range of ground joint components.
Quality with system Lenz® ground joint instruments are produced according to the standard DIN 12242 / ISO 383. Each production step is tested by a quality management system, based on DIN ISO 9001 / EN 29001. The tests are examined by a cone measuring device for checking the taper, a surface roughness meter for testing the roughness parameters and a wall thick­ness measuring apparatus with a magnetic inductive measuring process to guarantee a homogenuos concentricity and wall thickness.
A multiple-station unit serves for grinding as well as for pre- and post-polishing of our ground joints. An electro-mechanical scanner ensures constant quality. In cases of specific high demands on function and precision the grinding is processed by hand.
Production of ground joint workpieces made of DURAN® tubing on fully automatic glass forming machines.
The follow-up processing of NS cones on half- automatic circular grinding machines.
The pre- and post-polishing of NS sockets takes place on multiple station grindig machines.
Conicity testing: the accuracy of the ground joints is validated by highprecise cone measuring devices.
Product features • High taper accuracy of the cones • Precise concentricity • Small roughness of the surface • Excellent tightness • Minimized need for grease • No bend out of line
Our ground joint instruments are marked with the Lenz logo and indicate the respective size of the ground joint.
Conical ground joints acc. to DIN 12242/ISO 383