22 April 2025
Hannover Messe, for the eighth time
At Hannover Messe 2025 Dorukmak showed its industrial vibration-damping rubber parts. The next market in its sights is...
One million cycles. Zero ingress.
From mould to dispatch, under one roof.
1,100+ active moulds. Cut in our own tool room.
Company
Dorukmak at a glance
Integrated rubber and metal part production since 2004.
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120M+
Annual production capacity
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1.432.085
Finished parts in stock
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8.000m²
Hasanağa OSB facility
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220+
Employees
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%40
Direct export
Why Dorukmak?
One plant, one team.
The mould shop, compound mixing and the laboratory under one roof.
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Mould shop
Moulds are designed and cut in our own mould shop.
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Compound mixing
Compounds are mixed to formulation on our own site.
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Laboratory
Every batch of raw material is tested in the laboratory.
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Metal forming
Metal pressing and rubber production under one roof.
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Finished stock
1,432,085 finished parts in stock for uninterrupted supply.
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Mould stock
One of the largest mould stocks in the field.
Solution families
Every part solves a problem.
Five product families, from compound to final inspection on one site.
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Plain, metal-reinforced and bellows-type dust covers protecting tie rod ends, ball joints, steering and suspension assemblies from dust, mud and water.
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Metal-rubber mounts that damp vibration in engines, machinery and industrial equipment, with hardness matched to the load.
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Metal-reinforced and all-rubber bushings for suspension and moving assemblies.
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Metal rings, pressed parts and sheet forming produced on our own presses.
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Protection and bearing parts produced in TPU and by injection moulding.
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Customer-specific parts designed in our own mould shop. Send the drawing; we come back with a material recommendation and manufacturability notes.
Product finder
The right part, from one dimension.
Pick the group, type a dimension; the matches and a quote request on one screen.
Design
Optimised geometry
The decisions that set a part’s service life are made on the drawing.
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Designed with FEA
Wall thickness and convolution radii set by simulation.
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Our own tooling
Moulds designed and cut in our own mould shop.
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The right elastomer
Chosen from CR, NBR, EPDM, HNBR and TPU for the application.
Dorukmak Engineering
From drawing to series production.
Seven stages, one team. CAD, STEP or a technical drawing is all it takes.
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Send the drawing
A technical drawing, a 3D model or a sample part.
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Engineering review
Kinematic envelope, loads and service conditions.
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Material recommendation
A choice between CR, NBR, EPDM, HNBR and TPU.
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Manufacturability analysis
Wall thickness, radii and parting line optimisation.
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Prototype and tooling
The mould is cut in our own mould shop.
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Test and validation
Mud and water spray, ozone, compression set.
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Series production
Dispatch with full barcoded traceability.
Send us your part
Technical files are reviewed under a confidentiality undertaking.
Fully integrated production
Ten steps from raw material to dispatch, all under one roof.
Compounding, metal forming, tooling and vulcanisation on one site. Every batch is barcoded.
Growth
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2004
Otosansit
20 million parts/year · 450 m² · 30 employees
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2010
Görükle
60 million parts/year · 2,000 m² · 140 employees
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2021
Hasanağa OSB
95 million parts/year · 6,000 m² · 170+ employees
Quality
Repeatable precision
One standard and one record, from first sample to series production.
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One million cycles
Dynamic validation under mud and water spray.
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Repeatability
Controlled temperature, pressure and time, batch after batch.
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Traceability
Barcoded batch records from raw material to dispatch.
Doruk Lab
We engineer the right material into the right application.
The laboratory proves the material choice with test data, and shares the result with the customer.
Material
Polymer selection
Polymers that stay stable in grease and keep their flexibility between minus forty and plus one hundred and twenty degrees Celsius.
- CR
- NBR
- EPDM
- HNBR
- TPU
Validation
Test programme
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Dynamic mud and water spray
Flexed through a million cycles at extreme angles; zero ingress proven by grease analysis.
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Ozone and climatic ageing
Held in an ozone chamber and a high-temperature oven, looking for crack initiation.
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Compression set
Recovery measured after compression in grease at high temperature.
Failure analysis
Why did this part fail?
We trace a part returned from the field back to its root cause. The four failure modes we see most.
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Convolution root
Fatigue
Micro-cracks starting at the root of a convolution grow until the cover tears.
Root cause Tight convolution radius, irregular wall thickness
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First few thousand km
Premature failure
Tearing within the first few thousand kilometres; mud then works play into the joint.
Root cause Wrong raw material, under-curing, damage on assembly
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Outer surface
Ozone and grease attack
Vertical surface cracking; with the wrong polymer the rubber absorbs grease, swells and breaks up.
Root cause Polymer polarity mismatched to the application
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Sealing lip
Seal failure
Water entering, or grease escaping, where the lip meets the shaft or housing.
Root cause Parting line falling on the sealing lip
Our design answers
All four are solved at the design stage.
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Stress distribution by FEA
Simulation optimises wall thickness and convolution radii so stress is spread evenly through the body.
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Polarised elastomer selection
We specify polymers that stay stable in grease and keep their flexibility between minus forty and plus one hundred and twenty degrees Celsius.
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Parting line optimisation
Tooling design moves every manufacturing joint clear of the critical sealing surfaces.
Seeing something similar on your own part?
Send the part to usSectors
The same problem, under different loads and conditions.
We manufacture for the machinery industry, and above all for automotive.
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Automotive
Dust covers, bellows and vibration mounts for suspension and steering systems.
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Defence
Rubber and metal-rubber parts in bespoke compounds for demanding service conditions.
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Industry
Vibration isolation, sealing and protection for machinery and plant equipment.
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Agriculture
Protection parts for agricultural machinery, resistant to dust, mud and impact.
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Machinery
Bushings, mounts and plastic bearing applications for moving assemblies.
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Aviation
Bespoke parts where tight tolerances and full traceability are required.
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Another application?
Describe the application and we will recommend a material for its load and environment.
Global market
Nine parts in ten leave the country.
We focus on long-term partnerships, in line with a sustainable approach to growth.
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36
Countries exported to to date
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22
Active export countries
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%40
Direct export
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%90
Total sales going abroad
We have exported to 36 countries to date and ship actively to 22 today. Forty per cent of our output is exported directly; together with domestic sales, ninety per cent of it ends up abroad.
Export desk · export@dorukmak.com.tr
Quality and certification
Quality is a controlled process.
Every batch is recorded with barcoded traceability, and the results are shared with the customer.
- Incoming inspection — every batch of raw material is tested in the laboratory.
- Process control — compound, vulcanisation temperature and pressure are all recorded.
- Final inspection — dimensional, visual and functional checks before dispatch.
- Traceability — barcoded batch tracking from raw material to dispatch.
- Laboratory — compound and part testing in our own laboratory.
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IATF 16949:2016
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ISO 9001:2015
News & fairs
Meet us in the field.
Fair calendar and production news. Write ahead to arrange a meeting.
03 May 2024
New export markets: the USA and Italy
Back from its seventh Hannover Messe, Dorukmak named the USA and Italy as its next export markets.
30 April 2024
Dorukmak at Hannover Messe 2024
At Hannover Messe, 22–26 April 2024, Dorukmak was one of fourteen companies exhibiting from Bursa.
Ways of working
You choose how you want to work with us.
The same mould shop, laboratory and quality system sits behind all three models.
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OEM & Tier-1 manufacturers
Series supply
Series production under IATF 16949, with capacity planning and sample approval.
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Distributors & wholesalers
Spare parts programme
Deep stock: 1,432,085 finished parts and one of the largest mould stocks in the sector.
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Own-brand sellers
Private label manufacturing
Dorukmak manufactures, you sell under your own brand. Packaging, coding and labelling included.
Contact
Talk to the technical team directly.
Pricing and sample requests reach the sales engineers; custom part requests go straight to engineering.
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Factory
Hasanağa OSB Mah., HOSAB Sanayi Cd. No:56 · Nilüfer / Bursa
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Telephone
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E-mail
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Working hours
Monday – Friday · 08.30 – 18.00 (GMT+3)
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Custom part request
Send a drawing or the dimensions and engineering will look at it.
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Find a part by dimension
Lists the catalogue matches in seconds.
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Request a sample
Test the part on your own site before you order.
Direct line
Do you have a dimension, or a problem?
Give us the dimension and we will list the match from stock. Describe the problem and engineering will look at it.
- Telephone +90 224 483 60 90
- E-mail info@dorukmak.com.tr
- Working hours Monday – Friday · 08.30 – 18.00 (GMT+3)