Shaft for golf clubs and golf club

Abstract

Each point obtained by plotting flexural rigidity EI measured at ten sites on a shaft is defined as from T() to T() in this order from the head side, and the formula representing a line K that passes the T() and the T() is [Y=aX+b]. The values at the Y-intercepts on the lines that are parallel to the line K and that pass the points of from T() to T(), respectively, are defined as from bto b, respectively, and the minimum value among the values at the Y-intercept bto bis defined as bmin. In this shaft, slope 'a' of the line K is 0.04 or greater and 0.06 or less; any one of the b, b, b, b, band bis smaller than b; and the bmin is any one of bto b. The value (b−bmin) is 24 (N·m) or greater and 35 (N·m) or less, and the value (b−b) is 0 or greater and 10 (N·m) or less. This shaft achieves excellent flight distance performance and directionality of the hit ball.