67.4mm 79mm Stroker Billet Cranks for Fiat Punto 1.6L 1.9L Crankshaft

 Quick Detail

     Dimension

NLGROUP  DESIGN 

customized design counterweight                        Pendulum Undercut Counterweight

Knife Edge Counterweights                                      Oil Groove Counterweights

Knife Edge Counterweights                                   Tapered Counterweights

     Lighten Holes at Rod Journals       

Technical Features

• Materials:40CrNiMoA  Heating treatment:HRC34-38

• Crankshaft will get thermal refining after normalizing,HRC34-38.The difference will be within 4HRC on same one cranks

• No over burning,carbon-free surface layer is within 0.3mm 

• Folding,oilet,cracks, oxidation and other things is not permitted for Cranks macrostructure.

• Balance weight value need keep 0-20g.cm on counterweight of big end and small end

• Peening treatment will be done after balance weight 

• Nitrogen treatment will be done after precision grind,compound layer depth is 0.008mm after polishing.diffusion layer is over 0.3mm,hardness on surface is not less than 500HV.

• No damage,scallops and other visible disadvantage on surface.

• Crankshaft will be cleaned up to make sure there is no filings in oil hole.

• magnetic flaw detecting will be done according to standard JB/76729-93

• Other size tolerance :standdars GB1804-79  IT14,No marked place  roughness:Ra6.3

Processing & Packaging

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