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Mixing dacrotized high strength bolts with zinc plated nuts

We are an auto major in India. We would like to do Dacrotizing of fasteners for some application. I would like to know whether It will be required to do dacrotizing of bolt as well as nut (mating part). At the moment nut is having normal yellow zinc plating finish. If Bolt alone is dacrotized what will be effect of the same on torque and prevailing load characteristics? If both nut and bolt are dacrotized what will be the torque characteristics of assembly compared to Zinc plated assembly? Is there any effect of Bimetallic corrosion if only bolt alone is dacrotized?

Raghvendra Gopal
automotive manufacturer - Pune, India, Maharashtra, Inida
2004

Dacrotising is applied with a view to protect without embrittlement. Keping this aspect foremost one would consider applying the Dacro on the nuts as well, It makes sense to have uniform grade of coating if the SST expectation is common...for both nut and bolt.

Regards,

Asif Nurie [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016
2004

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