Special screws, fasteners and drawing parts up to 450 mm diameter and 3500 mm length from Rüthen.
Köhne Spezialschrauben GmbH & Co. KG
Rüthen (Lindental industrial estate) · DENew on Amplifa
About Köhne Spezialschrauben
Köhne Spezialschrauben is a manufacturer of special screws, standard parts and drawing parts founded in 1968, headquartered in the Lindental industrial estate in Rüthen, North Rhine-Westphalia. The company produces turned parts on CNC turning centers (diameters up to 450 mm, lengths up to 3500 mm), milled parts on modern machining centers, as well as flame-cut, laser, cast and formed parts to drawing. Core competencies are the chipless thread rolling technology with pressing forces up to 120 tonnes, highly precise deep-hole drilling technology and the production of high-strength cold-upset parts with optimized grain flow. Materials processed include quenched and tempered steels, fine-grained structural steels and stainless steels, special materials to DIN EN 10269 and ASME A193/A194, high-temperature steels and nickel alloys to DIN EN 10302, as well as titanium, aluminium, brass and engineering plastics. Material identification is carried out by spectral analysis in-house, and quality assurance by magnetic particle and ultrasonic testing. Customers come from industries such as wind energy, bridge construction, mechanical and plant engineering, pressure vessel construction, crane and lifting technology as well as aerospace. Surface treatments such as galvanizing, zinc flake coating or nitriding are performed in cooperation with partner companies.
- Site
- Rüthen
- Processes
- CNC turning (turned parts), CNC milling (milled parts), Deep-hole drilling technology, Thread rolling (chipless, press force up to 120 t), Cold upsetting production (upsetting/cold forging), Flame-cut parts, Laser-cut parts, Cast parts
- Materials
- Special materials to DIN EN 10269 / ASME A193/A194, High-temperature steels and nickel alloys, Aluminium, Titanium, Brass, Engineering plastics, Stainless steels (austenitic and ferritic, special grades), Unalloyed steels
- Certificates
- DIN EN ISO 9001:2015, AD 2000-Merkblatt W0, Pressure Equipment Directive 2014/68/EU
- Founded
- 1968
- Industries
- Wind turbines, Bridge construction, Aerospace, Mechanical and plant engineering, Oil and gas extraction, Nuclear facilities
- 01
Material analysis (spectral analysis)
- 02
CNC turning / CNC milling
- 03
Deep-hole drilling
- 04
Thread rolling
- 05
Cold upsetting production
- 06
Surface treatment (cooperation)
- 07
Testing (magnetic particle, ultrasonic)
Locations
Rüthen
DEProduction and administration site
- Part weight / size
- Ø 450 mm / L 3500 mm
- Lot size
- Single piece to series
- Materials
- Quenched and tempered steels, stainless steel, special materials, non-ferrous metals
- CNC turning centers (Okuma)
- Machining centers (milling)
- Thread rolling technology up to 120 t
- Deep-hole drilling technology
- Spectral analysis device
- Magnetic particle testing
- Ultrasonic testing
Components & Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| CNC turning (turned parts)Machining | – | 3500mm | – | Single piece – Series | Quenched and tempered steels, Stainless steels, Non-ferrous metals, Plastics, Special materials |
| CNC milling (milled parts)Machining | – | – | – | – | Quenched and tempered steels, Stainless steels, Non-ferrous metals, Special materials |
| Deep-hole drilling technologyMachining | – | – | – | – | – |
| Thread rolling (chipless, press force up to 120 t)Forming | – | – | – | – | – |
| Cold upsetting production (upsetting/cold forging)Forming | – | – | – | – | Quenched and tempered steels, Stainless steels |
| Flame-cut partsMachining | – | – | – | – | – |
| Laser-cut partsMachining | – | – | – | – | – |
| Cast partsCasting | – | – | – | – | – |
| Formed partsForming | – | – | – | – | – |
| Machining of forged partsMachining | – | – | – | – | – |
| Electroplated galvanizing (with blue/yellow/black passivation)Surface | – | – | – | – | – |
| Zinc chromatingSurface | – | – | – | – | – |
| Hot-dip galvanizingSurface | – | – | – | – | – |
| DACROMET/zinc flake coating (Dacromet/Geomet)Surface | – | – | – | – | high-strength parts |
| Nitriding & gas nitrocarburizingHeat treatment | – | – | – | – | – |
| Spectral analysis (in-house material analysis)Testing | – | – | – | – | austenitic steels, ferritic steels |
| Magnetic particle testingTesting | – | – | – | – | – |
| Ultrasonic testingTesting | – | – | – | – | – |
5 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| CNC turning centers | Okuma | – | Diameters up to 450mm, lengths up to 3500mm | – | Rüthen |
| Machining centers (milling) | – | – | – | – | Rüthen |
| Thread rolling technology (press force up to 120 t) | – | – | – | – | Rüthen |
| Deep-hole drilling technology | – | – | – | 2012 | Rüthen |
| Spectral analysis device | – | – | – | – | Rüthen |
Additional services
Quality & Certification
Quality assurance includes in-house spectral analysis as well as non-destructive testing by magnetic particle and ultrasonic methods. Certified to DIN EN ISO 9001:2015, AD 2000-Merkblatt W0 and the Pressure Equipment Directive 2014/68/EU.
| Evidence | Rüthen |
|---|---|
| DIN EN ISO 9001:2015 | |
| AD 2000-Merkblatt W0 | |
| Pressure Equipment Directive 2014/68/EU |
History
- 1968
Founded by business registration of Köhne Spezialschrauben GmbH & Co. KG.
- 1975
Start of specialized production of special screws.
- 1995
Relocation to the Lindental industrial estate in Rüthen for capacity expansion.
- 2012
Integration of highly precise deep-hole drilling technology to expand the site.
- 2026
Acquisition as of 01.01.2026 by Ziad Faidi, continuation of the company tradition.