A few listings lately and sales regarding stainless steel nuts & bolts. I personally am a bit cautious about using them on the exhaust manifold. I don't know if any reaction between s/steel and alloy occurs as in the head bolts,which as we all know is the reason that so many are a pig to get off. I looked the bolts up in a nut & bolt suppliers catalogue and the following guide was printed.
Stainless steel bolts are not High Tensile and must not be used for stressed connections.
Zinc Plated bolts after plating remain slightly weaker than unplated bolts. For maximum strength specify unplated (black) bolts.
Over the years it has been tradition to fit black studds with brass nuts. The reason that some break is because they have been fitted with steel nuts and they have rusted of corroded together. With brass nuts they can usually be removed by hook or by crook by splitting the soft brass nut. The s/steel bolt would probably shear on anything more than 15lbs /ft leaverage and might involve heads off or engine out to remove the snapped end. I would imagine they are O.K. for inlet manifold or covers etc. where they do not get a lot of stress or tighness .
Any opinions?
Bob
Stainless steel bolts are not High Tensile and must not be used for stressed connections.
Zinc Plated bolts after plating remain slightly weaker than unplated bolts. For maximum strength specify unplated (black) bolts.
Over the years it has been tradition to fit black studds with brass nuts. The reason that some break is because they have been fitted with steel nuts and they have rusted of corroded together. With brass nuts they can usually be removed by hook or by crook by splitting the soft brass nut. The s/steel bolt would probably shear on anything more than 15lbs /ft leaverage and might involve heads off or engine out to remove the snapped end. I would imagine they are O.K. for inlet manifold or covers etc. where they do not get a lot of stress or tighness .
Any opinions?
Bob
Comment