Surface Treatment of High-Strength Bolted Joints

by George C. Brookhart,
I. H. Siddiqi,
Desi D. Vasarhelyi,

Serial Information: Journal of the Structural Division, 1968, Vol. 94, Issue 3, Pg. 671-682

Document Type: Journal Paper


The effect of galvanizing on the ASTM A325 and A490 high-strength bolts and the performance of bolted joints under static loads in which the faying surfaces were galvanized, cold zinc painted, metallized, treated with vinyl wash or with another rust-preventing paint, were studied. Comparisons were made with nongahranized bolts and with joints with untreated mill-scale surfaces. The torque necessary to tighten the high-strength bolts is increased by galvanization, but this effect may be almost eliminated by the use of power torquing, or by lubrication. The hot dip galvanizing gave an average coefficient of friction of 0.23; the other surface treatments gave values between that of dry mill-scale and that of sandblasted metal surfaces.

Subject Headings: Bolted connections | Joints | Static loads | Load factors | Zinc | Comparative studies | Bolts | Energy consumption

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