GTK-Prototype UG was founded in 2014 by Tobias Günther and initially dealt with rapid prototyping machines.

Over the years, CNC milling and turning as well as assembly and development work were added due to customer requirements.

GTK-Prototype develops and designs on behalf of customers as well as internally using the most modern CAD systems such as Solid Works, Autodesk Inventor, Fusion 360 and others and inserts them into a comprehensive CAM system.
Through the production of prototypes in medical technology, mechanical engineering and the automotive sector, GTK-Prototype was able to acquire extensive experience in manufacturing.

In 2018, the production option laser cutting was added.

GTK-Prototype is currently based in Neuhausen near Tuttlingen and will move to the newly built company location in Radolfzell in the course of 2022.

GTS Gate To Steel GmbH is a German company based in Düsseldorf. We are based in the field of mechanical and plant engineering.
Our subsidiary is located in Wuxi near Shanghai. We have been in our line of business in China since 2004. We know the market and business inside and out.

Our customers are German companies that sell industrial equipment to China.

We are not an intermediary!

GTS produces itself in its own hall.
GTS takes over the production of the local production portion in China for the customers.

We manufacture both entire assemblies and individual parts - it only depends on the needs of our customers.
Of course we can also take care of the transport to Europe and all related formalities.

We stand for:

German quality made in China
Know-how protection
Customary market prices
On-time delivery

Our highly qualified team in our own assembly hall, together with a proven network of sub-suppliers, form your extended arm in China.
Together they realize your projects in your usual German quality.

GTS offers you an all-round carefree package tailored to your requirements.

Your competent partner in the field:

Turning - Milling - Grinding

Whether item or series production, we deliver the highest precision. Find out about our manufacturing capabilities, we can also solve your intended Zerspanungsproblem.

The company Günter Becker is in Osterode am Harz for over 30 years.
Until the early 70s, the main business focused on the development and production of automatic wire bending machines for electronic components such as resistors and transistors.

After introduction of semiconductor technology made the switch to using pure contract manufacturing in the field of turning, milling and grinding.
In this segment, we were not able to establish ourselves in the last southern Harz region through our quality work and numerous attract customers. For our customers today include well-known companies from all industries, including medical, aviation and aerospace technology, automotive industry.

We would be happy if we may this also includes you soon!

Services ...

Our range of services includes:

• Item and serial production
• Processing of customer parts according to drawing or sample
• procurement of materials with test certificate
• Installation of smaller assemblies
• Delegate of third party services, such as heat and surface treatment, to competent partners
• CAD Drafting according to DIN
• Final inspection


We process almost all materials such as:

• aluminum alloys
• Steel
• Rust-and acid-resistant steels
• Titanium alloys
• Plastics
• Chrome-nickel alloys
• and much more ...

About us
With our industry expertise, we can help you successfully and promptly implement your production project for mechanical components, assemblies, and housings for small to medium-sized series.

For more than 20 years, we have been experts in die casting, injection molding, and other mechanical processes. Our focus is on cross-process thinking.

In Germany, Europe and Asia (in-house certified production) we manufacture your mechanical components, assemblies or housings.

Our manufacturing services include:

Engineering: Technology consulting (wide range of materials and manufacturing processes); CAD evaluation, construction & development

Prototyping (close to series production; 1,-3,000 pieces) for die casting, injection molding, precision casting, sand casting, PA casting, vacuum casting, CNC milling, SLS & SLY

Series production for batch sizes of up to 25,000 units

Metal: aluminum die casting, zinc die casting, deep drawing, gravity die casting, sand casting
Plastics: injection molding, thermoforming, extrusion
Our Services:

Project-related surface finish
Coordination of the entire production project
Advice along the value chain
Assembly service, measurement reports
International logistics service

Soldering technology & heat treatments

Vacuum soldering, inert gas soldering, induction soldering
Annealing under vacuum and protective gas
Manufacture of complete solder assemblies

Here is a brief overview of our services:

- PCB Assembly (lead free wave soldering and SMD)

- soldering

- Custom Cable Assembly (round and ribbon cable) with examination

- Installation work for example 19 "floors with design and wiring

- Cabinet wiring