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Hydrogen Embrittlement in Machine Screws?

Q. Screw Material : MS C - 0.15 to 0.3%
Core Hardness 27 ~ 33 HRC
Bright Zinc electroplating with Yellow passivation.

Does the part require baking after plating?

Ganesh Giri
Quality for receiving - Pune, Maharashtra, India
December 6, 2010

A. It is generally regarded that de-embrittlement is not required for steels below 36 HRC, in which case these screws should not need it.

If you are in any doubt then carry out a de-embrittlement operation, it will not hurt the parts if you decide to do it.

Brian Terry
Aerospace - Yeovil, Somerset, UK
December 8, 2010

A. Dear Ganesh Giri,
If you are referring to ISO 4042 for the Fasteners.
If the core or case hardness is more than 320HV, Hydrogen de-embrittlement process is to be done.

Kannan Boopathi
- Salem, Tamil Nadu, India
December 9, 2010

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