Machining, assembly and tolerance ring manufacturing for tool, mould and machine building, from prototype to series production
Kritzner Metalltechnik GmbH
Schweinfurt · DietenheimNew on Amplifa
About Kritzner Metalltechnik
Kritzner Metalltechnik GmbH in Schweinfurt is a contract manufacturer for the tool, mould and machine building industry, producing prototypes, individual parts and series parts from virtually all materials. Its range of services includes sawing, 5-axis CNC milling, CNC turning with C and Y axes and driven tools, grinding, and the assembly of simple and complex assemblies including functional and safety testing. In addition, the company offers programmable annealing up to 1,000 °C; heat and surface treatments are outsourced externally and firmly integrated into the process. With up to 10,000 machine hours per month, extensive capacity is available for flexible orders. Since early 2026, Kritzner has also been manufacturing tolerance rings with the know-how, processes and customer base of Bosch Rexroth, whose long-standing preferred supplier the company was. In the same year, Lambacher Maschinenbau in Dietenheim near Ulm was acquired. A data service and an overnight service for prototype manufacturing round out the offering.
- Site
- Schweinfurt
- Processes
- Sawing (pre-machining), CNC milling (up to 5 axes, vertical and horizontal), Conventional milling, CNC turning (C and Y axes, driven tools, bar processing), Grinding, Assembly of simple and complex assemblies according to customer specifications (incl. functional or, Annealing (programmable, 1,000 °C), Measurement / QC
- Materials
- virtually all materials (prototypes, individual and series parts), Virtually all materials, Tolerance ring manufacturing, Annealing/heat treatment
- Certificates
- DIN EN ISO 9001, DIN EN ISO 14001, ISO 9001, ISO 14001
- Industries
- Tool making, Mould making, Mechanical engineering, Machining industry
- 01
Sawing/pre-machining
- 02
CNC milling up to 5 axes
- 03
CNC turning
- 04
Grinding
- 05
Annealing/heat treatment
- 06
External surface treatment
- 07
Assembly incl. functional and safety testing
- 08
Measurement/QC
Materials and Processes
Virtually all materials
Prototypes, individual parts and series parts are manufactured from virtually all materials, according to the company.
Tolerance ring manufacturing
Shaft-hub connector elements pressed in between the bearing bore and the shaft, taken over from Bosch Rexroth.
Annealing/heat treatment
Programmable annealing up to 1,000 °C in the in-house annealing furnace.
Our Locations
Schweinfurt
DEHeadquarters and manufacturing
- Part weight / size
- Workpiece weight up to 1,000 kg (DMU 95 Monoblock)
- Lot size
- Prototype, individual parts, series production
- Materials
- Virtually all materials
- Behringer HBE321A bandsaw automatic
- Trennjäger SPA_100_HM circular saw automatic
- DMG MORI CMX 600 V
- DMG MORI DMC 80 H (5-axis HSC)
- DMG MORI DMC 65 H Monoblock
- DMG MORI DMU 95 Monoblock
- Universal milling machines
- CNC lathes (C/Y axis, bar processing)
- Annealing furnace 1,000 °C, 850 x 1,200 x 2,700 mm
Dietenheim
DESite (acquired Lambacher Maschinenbau site)
Manufactured Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Sawing (pre-machining)Machining | – | Flat material 350 x 320 mm | – | – | – |
| CNC milling (up to 5 axes, vertical and horizontal)Machining | – | 950 mm × 610 mm × 720 mm | – | Prototypes/individual parts – Series production | – |
| Conventional millingMachining | – | 1120 mm × 400 mm × 400 mm | – | – | – |
| CNC turning (C and Y axes, driven tools, bar processing)Machining | – | 800 mm × Diameter up to 530 mm | – | – | – |
| GrindingMachining | – | – | – | – | – |
| Assembly of simple and complex assemblies according to customer specifications (incl. functional orAssembly | – | – | – | – | – |
| Annealing (programmable, 1,000 °C)Heat treatment | – | 2700 mm × 1200 mm × 850 mm | – | – | – |
| Measurement / QCTesting | – | – | – | – | – |
| Surface and heat treatment (outsourced externally, firmly integrated into the process)Surface | – | – | – | – | – |
| Tolerance ring manufacturing (shaft-hub connector elements for press-fitting)Forming | – | – | – | – | – |
| Tool, mould and machine building (prototypes, small series, series production)Engineering | – | – | – | – | – |
| Annealing (parts up to 1040 mm diameter)Heat treatment | – | 1040 mm diameter | – | – | – |
9 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Bandsaw automatic | Behringer HBE321A | – | Flat material 350 x 320 mm, round material ø10–ø320 mm | – | Schweinfurt |
| High-performance circular saw automatic (Trennjäger) | Trennjäger SPA_100_HM | – | Flat material 120 x 120 mm, round material ø25–ø160 mm | – | Schweinfurt |
| 3-axis CNC milling machine | DMG MORI CMX 600 V | – | X 600 mm, Y 560 mm, Z 510 mm; max. workpiece weight 600 kg; tool magazine 60 slots (SK40) | – | Schweinfurt |
| Horizontal machining center (5-axis) | DMG MORI DMC 80 H | – | X 630 mm, Y 800 mm, Z 850 mm; max. workpiece weight 600 kg; tool magazine 183 slots (HSK100); | – | Schweinfurt |
| 5-axis vertical machining center | DMG MORI DMC 65 H Monoblock | – | X 735 mm, Y 650 mm, Z 560 mm; tool magazine 90 slots (SK40); 3-fold pallet changer, | – | Schweinfurt |
| 5-axis vertical machining center | DMG MORI DMU 95 Monoblock | – | X 950 mm, Y 850 mm, Z 650 mm; max. workpiece weight 1,000 kg; tool magazine 60 slots (SK40); | – | Schweinfurt |
| Universal milling machines (conventional) | – | – | X 1,120 mm, Y 400 mm, Z 400 mm | – | Schweinfurt |
| CNC lathes (C and Y axes, driven tools, bar processing) | – | – | Diameter up to 530 mm, length up to 800 mm | – | Schweinfurt |
| Annealing furnace (programmable, 1,000 °C) | – | – | 850 x 1,200 x 2,700 mm | – | Schweinfurt |
Additional services
Reference customers
Quality and Certifications
Kritzner Metalltechnik is certified to DIN EN ISO 9001 and 14001 and aims for a delivery reliability of over 98%; the quality target is 100%. Inspection is carried out using its own measurement/QC capacities as well as functional and safety tests during assembly.
| Evidence | Schweinfurt |
|---|---|
| ISO 9001 | |
| ISO 14001 |
History
- 1948
Start of tolerance ring manufacturing in the Schweinfurt/Volkach region as “Star-Toleranzringe”
- 2026
Takeover of tolerance ring manufacturing from Bosch Rexroth including know-how, manufacturing processes and customer base
- 2026
Acquisition of Lambacher Maschinenbau, Dietenheim near Ulm