This study aims to explore the combined effect of soil density, pile slenderness ratio and interface roughness on the ultimate uplift capacity of tension pile embedded in dry sand. The ratio of interface friction to internal friction shows increasing in accordance to increasing in pile skin roughness with no significant affect to the change in relative density for a proper roughness state except that observed due combination between dense soil and rough pile skin. The pullout displacement required to reach ultimate load increased with increasing pile slenderness ratios and interface friction. Increasing relative density and slenderness ratio improved uplift resistance particularly for rough and medium-rough piles. Sharp improvements observed at L/D = 30, moderate at L/D = 20, and only marginal changes at L/D = 10. Pile skin roughness significantly affected uplift performance, with rough and medium-rough piles outperforming smooth piles; however, in some conditions, the improvement was marginal. As conclusion, the slenderness ratio has significant effect on the developed uplift tension capacity comparing to soil density and pile skin roughness that have moderate and marginal effect respectively. Furthermore, allowable displacement criteria should be incorporated in design alongside ultimate capacity, since high capacity may be achieved at displacements that are not tolerable for structures.