Patent ID: 8157669

Claim:
A shaft for an iron or wood golf club, the shaft having a longitudinal axis and capable of being tested under a torsional stability test device, the test device having a first support and a torsional load applicator, the shaft comprising: a first tubular portion formed of a first material, the first tubular portion having a butt end and a distal end, the distal end of the first tubular portion having an inside diameter, D 2 ′; and a second tubular portion formed of a second material different from the first material, the second tubular portion having a proximal end and a tip end, the tip end having an outside diameter of less than 0.400 inches and the proximal end of the second tubular portion having an outside diameter, D 3 , the outside diameter, D 3 , is greater than the inside diameter, D 2 ′, such that a mechanical lock is achieved when the inner surface of the distal end of the first tubular portion engage the outer surface of the proximal end of the second tubular portion; the shaft having a resistance to twisting about the longitudinal axis of the shaft of less than 2.5 degrees, when measured in the torsional stability test device at a point 20 inches from the first support along an exposed length of the shaft, wherein the first support is fixedly secured to approximately 2.25 inches of the shaft at the tip end of the first tubular portion, and wherein the torsional load applicator applies a 1 ft-lb torque to the butt end of the second tubular portion of the shaft, the shaft having a weight within the range of 45 to 95 grams.