Choice of materials

BOSCH produces hinges in various types of steel, stainless steel and aluminium.

You can select from the following:


Bare steel can be the best choice depending on your application. It can be galvanised or powder coated according to your specifications. In larger volumes this may also yield a substantial price advantage.

Steel DC01

DC01 is a cold rolled type of steel demonstrating excellent intrinsic strength, well suited for hinges. DC01 is an outstanding choice, particularly for lighter hinges with less loading. DC01 has a tensile strength of 270-410 N/mm².

Steel S355J2

S355J2 is a hot rolled quality steel with an elevated tensile strength. This material is available from a 3mm gauge. We particularly recommend this material for a hinge required to bear higher loading. S355J2 has a tensile strength of 470 to 630 N/mm. Tests have shown that even when challenged by high dynamic loading the hinges demonstrate excellent wear and tear resistance.


Silverlook; the name we give to our own process of electrolytic galvanising. Silverlook is free of chromium VI and does indeed have a silver-like appearance. In the passivation process, a transparent top coat is applied on top of the basic passivated layer to improve considerably the metal’s resistance to corrosion.

Silverlook meets the European EN 1935 class 3 = 96 hours standard for hinges. Results of the corrosion resistance test * (BOSCH Hinges April 2004)
* Salt spray test ASTM B117/ DIN 50021, Kesternich test DIN 50018

Corrosion resistance

Please contact us for your copy of the test results.
In addition to electrolytic galvanising, upon request we can offer our clients various options for Sendzimir pre-galvanised steel or Zincor.

Powder coating

If you have colour requirements powder coating is an excellent option, both as a decorative finish and as a corrosion resistant layer to the hinge. Please contact us to discover the full range of possibilities.


NIROX® is our own registered trademark for an extra special coating. This barely visible transparent coating can be applied to both galvanised and stainless steel. The coating is applied using the anode – cathode principle. In this process, the product is fully immersed and degreased, pre-treated, coated and enamelled at a low temperature in a number of baths.

NIROX® offers numerous advantages. It provides additional corrosion protection and is electrically insulating (consider stainless steel and aluminium contact). Products with NIROX® achieve 800 hours in the ASTM B117/ DIN 50021 salt spray test. Click here for a specification sheet.

Stainless steel

BOSCH specialises in stainless steel hinges. One of the features of stainless steel is that it ‘passivates’ in the air, providing excellent corrosion resistant qualities.

BOSCH offers three austenitic types of stainless steel, each excellent for use in rolled hinges (cold forming).

Active agent number AISI Tensile strength
Material gauge Application
A No. 1.4301 304 620-680 1-6mm General
A No. 1.4401 316 580-620 1-6mm Saltwater resistant
Stainless steel 304 (A No. 1.4301)

304 is the classic, most austenitic type of stainless steel. This type of stainless steel has excellent all round qualities, applicable to a wide range of situations. Its outstanding corrosion resisting qualities underline this. Click here for a specification sheet.

Stainless steel 316 (A No. 1.4401)

316 is applied in conditions where the highest standards are demanded regarding resistance to corrosion, including chloride and saltwater resistance. It is particularly used for applications in coastal regions, the maritime and offshore sector and in specific industrial processes (cleanroom, medical equipment and foodstuffs). Click here for a specification sheet.

Duplex Stainless steel 329 (A No. 1.4462)

Recently, for the first time, BOSCH Hinges produced a rolled hinge made from Duplex stainless steel for a client in the wind energy sector. Thanks to its superb corrosion resistance and strength, Duplex is the specialist’s first choice for the petrochemical industry and the off-shore sector.
The results can be viewed here.

Cleaning stainless steel

‘Stainless’ does not imply that the steel will never corrode. With hinges, this will eventually become manifest as pitted corrosion. Regular cleaning is required as a preventative measure.

Further information about the methods for cleaning stainless steel can be found at:

AluminiumAluminium is used in rolled hinges (including piano hinges), albeit to a much lesser extent. This is because aluminium is more difficult to roll and has a reduced tensile strength. There are still conditions in which aluminium can be the material of choice though. Aviation is one good example. For these situations BOSCH hinges use ALMG3 combined with a stainless steel or brass pin. Material gauge is limited to 2 mm.Request or more information?Simply let us know your requirements and we will immediately provide you with a quote or an anwser to your question.

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