BS 1706:1990 Method for specifying electroplated coatings of zinc and cadmium on iron and steel Provides a list of BS 1706:1960 PDF (Personal Use) Our bolts and nuts are required to have a finish of bright zinc plated passivated to class 2d as per BS1706 spec. We have been offered a passivation class 2C. RED RUST h. A2A. Fe/Zn 5c1A. A. 6. 24. A2B. Fe/Zn 5c1B. B. 12. 36. A2C. Fe/Zn 5c2C. C. 48. 72. A2D. Fe/Zn 5c2D. D. 72. 96. A2R. Fe/Zn 5Bk. 5. Bk. 12. -. A3A. BS 1706-1990 Method For Specifying Electroplated Coatings Of Zinc And Cadmium On Iron And Steel_??/??_????_?????BRITISH STANDARD BS Dec 15, 2008 -BS 1706 : Electroplated Coatings of Zinc and Cadmium on Iron and Steel. BS 1706. 90th Edition, July 31, 1990 Secure PDF. Single User. $233.00. Print. TECHNICAL SPECIFICATION. Material: carbon steel CS70, standard duty. finish: zinc plated to BS1706 class C. length tolerances: length tol. ? 10mm. +0.5mm. BS 1706:1990. BS 7371-12:2008. Standard for imperial fasteners, thickness is dependent upon screw thread dia and passivation called up by the appropriate Jul 31, 1990 - BS 1706; Method for specifying electroplated coatings of zinc and cadmium onto iron and steel. • BS 4800: Schedule afpaint colours for building purposes.