\documentclass{article}
\usepackage{tabu,hhline}%%  package
\begin{document}
	

	

	\begin{table}
		\centering
		\caption{coefficients}
		\label{Tabel.Cofficient}
		
		\begin{tabu}{@{}ccccc@{}}
			\hhline{=====}
			$K_{1}$   & $K_{2}$   & $K_{3}$   & $K_{4}$    & $K_{5}$ \\ \hline
			$1$ & $2$ & $3$ & $4$ & $5$  \\ 
			\hline
		\end{tabu}
		
	\end{table}
\end{document}