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Hardfacing Screw
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  • Air ProHardfacing Screw

Hardfacing Screw

The enemy of screw and barrel efficiency is wear. Screw wear is a result of the flow of plastic against the screw and barrel as well as metal contact between the flights and barrel.Welcome to buy Hardfacing Screw from us.

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Product Description

Hardfacing screw

The enemy of screw and barrel efficiency is wear. Screw wear is a result of the flow of plastic against the screw and barrel as well as metal contact between the flights and barrel.

Therefore, to expand screw life, wear resistance alloys are applied over the top of the screw flights. The thickness of such alloys varies from 1.0mm to 2.5mm This method of application is called “Hard Facing”, that’s why we call screws with hard facing process “hardfacing screw”.

EJS has been producing hardfacing screws for over 15 years, especially these years more and more customers are using hardfacing screw for their longer life time.


Bore diameter available for hardfacing screw

¢16~¢500


Popular Materials used for hardfacing screw

38CrMoAlA(1.8509)

34CrAlNi7(1.8550)

31CrMoV9(1.8519)

40Cr(4340)

42CrMo(4140)

SKD11


Alloy powder of hardfacing screw

Kennametal Stellite Ni60

Colmonoy 56

Colmonoy 83

EJS01 alloy

EJS04 alloy


Application of hardfacing screw

Single screw barrel

Twin screw barrel


We received your hardfacing screws. Are you sure your people have done the inspection? Look at the crack, I think any people will see this clearly. How can we install such a screw on our machine? How fast can you get us a new screw? We need them now. Please let me know.

As a quality-oriented company, EJS tries everything to avoid cracks. However, it is not possible to completely exclude the possibility of cracks forming. The company consulted senior engineers, checked with experts, analyzed together with experienced production managers and sought advice from long-term customers in different countries. Finally EJS accepted the fact that cracks are inevitable for some alloys on big sizes, because no cracks means soft flights. There are some alloys which you cannot avoid micro cracks. They always exists.


Moreover EJS started to know that


When the cracks are intense, AND the flights always stay - it is acceptable.

When the cracks are long, AND the flights always stay - it is acceptable.

When the cracks are wide, AND the flights always stay - it is acceptable.

When the cracks are regular in one direction - it is acceptable.

If the crack causes the peal-off - it is NOT acceptable.


Using these simple questions, customers can check whether their screws are OK or not. In case of doubt, the experienced EJS staff will be happy to help.




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