Machining specializing in Deep Hole Drilling, CNC Turning and Milling, and Hydraulic Cylinder Construction in Mülheim an der Ruhr
HBT-Hohlbohrtechnik Gebr. Krug GmbH
Mülheim an der Ruhr (DE)New on Amplifa
About HBT-Hohlbohrtechnik
HBT-Hohlbohrtechnik Gebr. Krug GmbH in Mülheim an der Ruhr is a contract machining shop with technical specialization in deep hole drilling. The range of services includes core drilling, pre-drilling, through drilling, blind hole drilling, and step drilling in various diameters and drilling depths, complemented by CNC turning, CNC milling, honing, and bore machining. The manufacturing program includes machined components to customer specifications, complete assemblies, and components for mechanical engineering, hydraulics, and pneumatics, including assembly and commissioning. In its own locksmith shop, it refurbishes hydraulic and pneumatic components as well as machines and gearboxes; hydraulic cylinders, even in special dimensions, are pressure tested on a test stand up to max. 500 bar. Customers include mechanical engineering, mining/material handling technology, rail vehicle construction (locomotive wheels and axles for bogies), and the construction industry. The company was founded in 1963 by Deprag Schulz KG and continued in 1983 as HBT-Hohlbohrtechnik; production takes place at the headquarters in Mülheim an der Ruhr.
- Site
- Mülheim an der Ruhr
- Processes
- Deep Hole Drilling, Core Drilling, Pre-drilling, Through Drilling, Blind Hole Drilling, Step Drilling, CNC Turning, CNC Milling
- Materials
- Deep Hole Drilling, CNC Turning, CNC Milling, Honing, Bore Machining, Hydraulic Cylinder Construction
- Certificates
- DIN EN ISO 9001, ISO 9001
- Founded
- 1983 (Stan
- Employees
- 20-49
- Industries
- Mechanical Engineering, Mining/Material Handling Technology, Rail Vehicle Construction, Hydraulics/Pneumatics, Civil Engineering and Construction, Rail Vehicle Construction (Locomotive wheels, axles for bogies)
- 01
Deep Hole Drilling (Core, Pre-bore, Through, Blind, Step drilling)
- 02
CNC Turning
- 03
CNC Milling
- 04
Honing / Bore Machining
- 05
Locksmith and Maintenance
- 06
Assembly of Assemblies
- 07
Testing (Pressure testing up to 500 bar)
- 08
Commissioning
Processes and Manufacturing Focus
Deep Hole Drilling
Core, pre-bore, through, blind hole, and step drilling in various diameters and drilling depths as the core discipline of the operation.
CNC Turning
Contract turning on CNC-controlled machines, e.g., for locomotive wheels, axles, and piston rods.
CNC Milling
Contract milling on CNC-controlled machines for general mechanical engineering parts.
Honing
Fine machining of bores to achieve high surface quality and dimensional accuracy.
Bore Machining
Processing large-volume workpieces on bore machines as a supplement to deep hole drilling.
Hydraulic Cylinder Construction
Manufacturing of cylinders, including special dimensions, with pressure testing up to max. 500 bar.
Locations
Mülheim an der Ruhr
DEHeadquarters and Manufacturing
- CNC-controlled turning and milling machines
- Pressure test rig for hydraulic cylinders up to max. 500 bar
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Deep Hole DrillingMachining | – | – | – | – | – |
| Core DrillingMachining | – | – | – | – | – |
| Pre-drillingMachining | – | – | – | – | – |
| Through DrillingMachining | – | – | – | – | – |
| Blind Hole DrillingMachining | – | – | – | – | – |
| Step DrillingMachining | – | – | – | – | – |
| CNC TurningMachining | – | – | – | – | – |
| CNC MillingMachining | – | – | – | – | – |
| HoningMachining | – | – | – | – | – |
| Bore MachiningMachining | – | – | – | – | – |
| Mechanical Processing / Contract MachiningMachining | – | – | – | – | – |
| Locksmith: Maintenance of Hydraulic and Pneumatic Components, Machines, and GearboxesAssembly | – | – | – | – | – |
| Hydraulic Cylinder Construction including Special DimensionsFitting | – | – | – | – | – |
| Pressure Testing up to max. 500 barTesting | – | – | – | – | – |
| Manufacturing complete assemblies (Mechanical Engineering, Hydraulics, Pneumatics) includingAssembly | – | – | – | – | – |
| Processing Locomotive Wheels and Axles for BogiesMachining | – | – | – | – | – |
2 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| CNC-controlled machines (Turning and Milling area) | – | – | – | – | Mülheim a. d. Ruhr |
| Test rig for hydraulic cylinders (up to max. 500 bar) | – | – | – | – | Mülheim a. d. Ruhr |
Additional services
Quality
Manufacturing is conducted according to the quality management system DIN EN ISO 9001 (Certificate No. QS-598 HH). Hydraulic cylinders are pressure tested on a dedicated test stand up to max. 500 bar.
| Evidence | Mülheim an der Ruhr |
|---|---|
| ISO 9001 |
History
- 1963
Foundation of the location by Deprag Schulz KG; began with the production of compressed air tools; deep hole drilling was already being carried out in the 1960s.
- 1983
Sold to the successor company HBT-Hohlbohrtechnik; conversion of the manufacturing program to general mechanical engineering components.