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.
• 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
| Nominal size (NS) |
Cone/socket Ø1 (mm) | Cone/socket Ø2 (mm) | Length (mm) |
|---|---|---|---|
| 5/13 | 5 | 3,6 | 13 |
| 7/16 | 7,5 | 5,8 | 16 |
| 10/19 | 10 | 8 | 19 |
| 12/21 | 12,5 | 10,3 | 21 |
| 14/23 | 14,5 | 12,1 | 23 |
| 19/26 | 18,8 | 16,1 | 26 |
| 24/29 | 24 | 21 | 29 |
| 29/32 | 29,2 | 25,9 | 32 |
| 34/35 | 34,5 | 30,9 | 35 |
| 45/40 | 45 | 40,9 | 40 |
| 60/46 | 60 | 55,3 | 46 |
| 71/51 | 71 | 65,8 | 51 |
| 85/55 | 85 | 79,4 | 55 |
| *approximate measures | |||
