Too chewy? Too hard? Too dry?

Materials that are difficult to machine?
Simply manufactured with reliability.

With over 35 years of experience, we manufacture precision turned parts from difficult-to-machine materials- reliably and to the highest quality standards. From the drawing to the finished product.
Submit a detailed inquiry - 48hr response

Find out now if your material is one of our classics

Specialist in difficult-to-machine materials

e.g., high-strength steels, 42CrMo4, chromium-nickel stainless steel, and many more

<3 µm concentricity

Precision that others can't match

Full in-house production

(Hard) turning, (hard) milling, grinding, hardening, and coating—all from a single source

Starting at 500 units

up to mass production

What We Offer  - Our Expertise
at a Glance

Tool wear affects the price

High-strength steels and special alloys can destroy standard tools in minutes. What works with standard materials becomes a nightmare when dealing with 42CrMo4 or hardened 1.2343.

High scrap rates jeopardize your on-time delivery record

Without the right expertise, cracks, warping, and dimensional deviations can occur. As a result, many companies are unable to deliver reliably.

High scrap rates jeopardize your on-time delivery record

Without the right expertise, cracks, warping, and dimensional deviations can occur. As a result, many companies are unable to deliver reliably.

A lack of experience leads to project delays

Every material requires its own approach. Without years of experience, a profitable order can quickly turn into a money-losing venture.

Services at a Glance

Long turning:

• Up to Ø 23 mm
• 5-axis simultaneous milling
• Deep-hole drilling

Short turning:

• Up to Ø 65 mm
• Up to 300 mm in length
• With Y-axis

3 + 2-axis milling:

• Up to 3 axes simultaneously
• Fully automated with zero-point clamping system
• Dimensions: L x W x H 150 x 120 x 100 mm


5-axis milling:

• Up to 5 axes simultaneously
• Fully automated with zero-point clamping system
• Dimensions L x W x H: 150 x 80 x 65 mm

Hard turning:

• Internal and external machining
• Concentricity accuracy up to 0.003 mm
• Fully automated


Cylindrical grinding:
• External grinding between centers or in a chuck
• Internal grinding in a chuck


Other processes:

• Honing
• EDM

Blasting:

• Sandblasting
• Shot blasting

Tumble finishing:

• Deburring
• Polishing

A Family That Keeps Its Word - What You Get From Us

As a family-owned business based in Pforzheim, we have years of experience with our materials and always keep our word.

Response within 48 hours

No weeks of uncertainty - you’ll receive a definitive response regarding your project quickly.

Efficient machining of difficult-to-machine materials

Where others have high scrap rates, we work reliably and precisely.

Final product, including hardening and coating

(Hard) turning, (hard) milling, grinding, hardening, and coating—all from a single source
Submit a detailed inquiry

What our customers say

★★★★★
"Magyarországi forgalmazóként (Premium-S Kft.) régóta dolgozunk együtt az Inoparttal, és rendkívül meg vagyunk elégedve. Kiváló minőségű termékek, gyors kiszolgálás és kedves kommunikáció jellemzi ezt a céget, szívesen dolgozunk velük! :)"

Marianna Vaskó

Sales Manager
Premium-S
Hungary
★★★★★
"A reliable vendor that supply ISCAR wide variety of items and tools. Their production plan and stock management is perfect, assisting ISCAR to supply clients needs at the best service.
Thank you Janine and all the wonderful people of INOPART for all the great effort you do, and for the cooperation we have!
Sharon, ISCAR LTD Logistics Dpt."

Sharon Golani

Logistics Dpt.
ISCAR L.T.D
Israel
★★★★★
"We have been working with this supplier for many years, and they have consistently proven to be a dependable partner.
Special recognition goes to Ann from the sales department. Since she was assigned to our account, she has been highly professional, responsive, and proactive, consistently ensuring smooth cooperation. Her support adds real value to the partnership."

Dragan Jovanovic

COO
iSWISS Corporation
USA
★★★★★
"As Optima Tools, the official dealer in Poland, we are highly satisfied with our partnership with Inopart. Their tools represent top-tier German quality and precision. Communication is always professional, and deliveries are punctual. Highly recommended for anyone looking for reliable industrial solutions!"

Dawid Księżarczyk

Geschäftsführer
OPTIMA TOOLS Stefanik Sp. j.
Polen
★★★★★
"Top Qualität, schnelle und einwandfreie Lieferung!
Wir arbeiten seit mehreren Jahren mit der Inopart GmbH zusammen und sind sehr zufrieden!"

Christian Grabowski

Technischer Vertrieb
Prestera Tool System GmbH
Deutschland
★★★★★
"Japan's manufacturing sector boasts a large number of “meticulous” users. We primarily sell INOPART collets and back turning tools for automatic lathes, receiving favorable customer reviews.
Amid growing demand for automatic lathes, these are promising products with strong growth potential, making them ideal for focused sales efforts. Congratulations!"

Bunji Takahashi

President
Noah Corporation
Japan
★★★★★
"Kompetente Mitarbeiter, schnelle Lieferung und qualitativ hochwertige Produkte. :-)"

Carsten Willhelmsen

Geschäftsführer
HOWIBA Präzisionswerkzeuge
Wilhelmsen Maschinen & Werkzeuge e. K
★★★★★
"We would like to compliment you on your excellent customer service and timely feedback on all our requests."

Sabrina

CHIA-MO
Tools and Workholding Devices
★★★★★
"I have been working with them / in contact with therm for serveral years now, and I can only express my full satisfaction. Quality, trust, and consistency have always been present. Every interaction is simple. genuine, and professional. It`s rare to find such a long-lasting and positive relationship: reliability, attentiveness, and respect are always there.
i highly recommend them!"

Romain Sauton

Technico-commercial EMO
OUTIMAT Groupe
★★★★★
"Great experience with Inopart! I’ve been a customer for a long time, and their bar feed collets have always been solid, reliable, and really well made. You can tell they put a lot of care into their products. The team is consistently helpful, easy to talk to, and they always make the process simple. Definitely a company I’m happy to keep recommending."

Tomáš Pavlík

PM-TECH s.r.o.
★★★★★
"Ein großes Lob an den Service gegenüber des Kunden!
Hervorzuheben wäre hierbei insbesondere der Verkauf, der über alle Maßen hin freundlich und zuvorkommend sehr dringend benötigte Angebote immer wieder im Eiltempo offeriert.
Verbesserungsvorschlag: Besser geht's nicht!!!
Prima! Weiter so...."

Ralf Widmann

Technische Beratung + regionaler Vertrieb
Vmax Präzisionswerkzeuge GmbH & Co.KG
★★★★★
"Magyarországi forgalmazóként (Premium-S Kft.) régóta dolgozunk együtt az Inoparttal, és rendkívül meg vagyunk elégedve. Kiváló minőségű termékek, gyors kiszolgálás és kedves kommunikáció jellemzi ezt a céget, szívesen dolgozunk velük! :)"

Marianna Vaskó

Sales Manager
Premium-S
Hungary
★★★★★
"A reliable vendor that supply ISCAR wide variety of items and tools. Their production plan and stock management is perfect, assisting ISCAR to supply clients needs at the best service.
Thank you Janine and all the wonderful people of INOPART for all the great effort you do, and for the cooperation we have!
Sharon, ISCAR LTD Logistics Dpt."

Sharon Golani

Logistics Dpt.
ISCAR L.T.D
Israel
★★★★★
"We have been working with this supplier for many years, and they have consistently proven to be a dependable partner.
Special recognition goes to Ann from the sales department. Since she was assigned to our account, she has been highly professional, responsive, and proactive, consistently ensuring smooth cooperation. Her support adds real value to the partnership."

Dragan Jovanovic

COO
iSWISS Corporation
USA
★★★★★
"As Optima Tools, the official dealer in Poland, we are highly satisfied with our partnership with Inopart. Their tools represent top-tier German quality and precision. Communication is always professional, and deliveries are punctual. Highly recommended for anyone looking for reliable industrial solutions!"

Dawid Księżarczyk

Geschäftsführer
OPTIMA TOOLS Stefanik Sp. j.
Polen
★★★★★
"Top Qualität, schnelle und einwandfreie Lieferung!
Wir arbeiten seit mehreren Jahren mit der Inopart GmbH zusammen und sind sehr zufrieden!"

Christian Grabowski

Technischer Vertrieb
Prestera Tool System GmbH
Deutschland
★★★★★
"Japan's manufacturing sector boasts a large number of “meticulous” users. We primarily sell INOPART collets and back turning tools for automatic lathes, receiving favorable customer reviews.
Amid growing demand for automatic lathes, these are promising products with strong growth potential, making them ideal for focused sales efforts. Congratulations!"

Bunji Takahashi

President
Noah Corporation
Japan
★★★★★
"Kompetente Mitarbeiter, schnelle Lieferung und qualitativ hochwertige Produkte. :-)"

Carsten Willhelmsen

Geschäftsführer
HOWIBA Präzisionswerkzeuge
Wilhelmsen Maschinen & Werkzeuge e. K
★★★★★
"We would like to compliment you on your excellent customer service and timely feedback on all our requests."

Sabrina

CHIA-MO
Tools and Workholding Devices
★★★★★
"I have been working with them / in contact with therm for serveral years now, and I can only express my full satisfaction. Quality, trust, and consistency have always been present. Every interaction is simple. genuine, and professional. It`s rare to find such a long-lasting and positive relationship: reliability, attentiveness, and respect are always there.
i highly recommend them!"

Romain Sauton

Technico-commercial EMO
OUTIMAT Groupe
★★★★★
"Great experience with Inopart! I’ve been a customer for a long time, and their bar feed collets have always been solid, reliable, and really well made. You can tell they put a lot of care into their products. The team is consistently helpful, easy to talk to, and they always make the process simple. Definitely a company I’m happy to keep recommending."

Tomáš Pavlík

PM-TECH s.r.o.
★★★★★
"Ein großes Lob an den Service gegenüber des Kunden!
Hervorzuheben wäre hierbei insbesondere der Verkauf, der über alle Maßen hin freundlich und zuvorkommend sehr dringend benötigte Angebote immer wieder im Eiltempo offeriert.
Verbesserungsvorschlag: Besser geht's nicht!!!
Prima! Weiter so...."

Ralf Widmann

Technische Beratung + regionaler Vertrieb
Vmax Präzisionswerkzeuge GmbH & Co.KG

We machine these difficult-to-machine materials on a daily basis

Steels

Low-alloy case-hardening steel:

1.6587 / 18CrNiMo7-6

Alloyed quenched and tempered steel:

1.7225 / 42CrMo4

Alloyed cold-work steel:

1.2826 / 60MnSiCr4

1.2379 / X155CrVMo12-1

High-alloy hot-work steel:

1.2343 / X37CrMoV5-1 oder 1.2343 ESU

1.2344 / X40CrMoV5-1

Stainless tool steel:

1.2083 / X40Cr14

Ferritic and martensitic steels:

1.4034 / AISI 420C oder DIN X46Cr13
1.4021 / X20Cr13 und AISI 420
1.4112 / X90CrMoV18

Austenitic chromium-nickel stainless steels:

1.4301 / X5CrNi18-10, AISI 304 oder V2A
1.4401 / X5CrNiMo17-12-2 oder AISI 316
1.4542 / X5CrNiCuNb16-4 oder 17-4 PH

High-strength steels:

ETG88
ETG100 / SAE1144 bzw. 44SMn28 (1.0762) DIN 668 – ISO
HSX110/130

Other recyclables

Aluminum bronze:

1.6587 / 18CrNiMo7-6

Aluminiumbronze:

Ampco & Alternatives

Can't find your material here? Feel free to contact us anyway - we'll be happy to check if it's possible.

Finishing - Everything from a single source

Heat treatment

• Case hardening
• Induction hardening
• Vacuum hardening
• Nitriding
• Plasma nitriding
• Carbonitriding
• Nitrocarburizing
• Annealing
• Starting

Surface treatment

• Galvanizing
• Nickel plating
• Chrome plating
• Burnishing
• DLC coating
• Tungsten carbide coating
• Phosphating
• Anodizing

Why buyers trust us

Over 35 years of experience with difficult-to-machine materials

We have been manufacturing tool holders and collets for international customers since 1988. We now put this experience to work for your contract manufacturing needs.

ISO 9001-certified quality

Our quality assurance process, which includes an air-conditioned measurement room, ensures concentricity of <3 µm - even with the most challenging materials.

A reliable partner for precision parts

Mechanical engineering, automotive suppliers, medical technology - industries with the highest quality standards rely on us.

Any questions? Let’s talk about your project!

If you need precision-quality components made from materials that are difficult to machine and have read this far, there’s a good chance we can help you.

Send us your drawing or inquiry - you’ll receive a binding response regarding feasibility and costs within 48 hours.
Submit a detailed inquiry - 48hr response

Inopart GmbH

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Contact

  • Rastatter Straße 30, 75179 Pforzheim
  • +49 7231 281549-0
  •  info@inopart.de
Office hours:
Monday – Friday
8am – 5pm
Get a quote now
Use our contact form to send us your drawing or an inquiry from the catalog - you’ll receive a binding response regarding feasibility and costs within 48 hours.
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