Abstract: A golf club includes a golf club head and a shaft attached to the golf club head, the golf club including the golf club head provided with a shaft insertion hole having an upper opening and a lower opening, the shaft insertion hole having an internal surface provided with an undercut groove, the shaft having a tip end, a shaft sleeve adaptor attached to the tip end of the shaft, the shaft sleeve adaptor inserted into the shaft insertion hole through the upper opening and having a first thread portion, a fastener comprising a second thread portion engaging with the first thread portion of the shaft sleeve adaptor through the lower opening of the shaft insertion hole, and a washer held in the undercut groove of the shaft insertion hole and disposed between the fastener and the shaft sleeve adaptor.

Abstract: Provided is a golf club head having a reduced weight while also preventing degradation in the ball hitting sound. The golf club head includes a head body that is a hollow structure, and a rib that rises from an inner surface of the head body. An opening having a non-circular shape is formed in a side surface of the rib. Note that the opening referred to here may be a through-hole or an opening that has a bottom.

Abstract: A wood golf club head is provided. The wood golf club head includes a hollow structure body having a face surface for hitting a ball. The hollow structure body has an inner surface and a thick portion in a predetermined region on the inner surface excluding a rear surface of the face surface. The thick portion is located outward of a virtual curved surface and has an outer surface extending along the virtual curved surface. The virtual curved surface is (a) a curved surface centered about a predetermined reference point located inside the hollow structure body or (b) a curved surface having a central axis that is a straight line passing through a reference point located inside the hollow structure body.

Abstract: A recess 14 is formed in a sole 9 of a head 4. The recess 14 is an example of an opening part. A socket 10 is mounted to the recess 14. A weight body 12 capable of being attached/detached is attached to the socket 10. The weight body 12 has an engaging part 32 and an exposed part E1. The socket 10 has an interposition part 11. The interposition part 11 is interposed in at least a part between the exposed part E1 and a head body h1 in an attached state where the engaging part 32 is placed at an engaging position EP. The exposed part E1 is exposed to the outside in the attached state. The interposition part 11 does not fix the weight body 12.

Abstract: Provided is a golf club head which produces an improved hitting sound obtained without impairing the appearance of the sole section. A golf club head having a hollow portion (i) formed therein has a sole portion (5) which forms the bottom surface of the head. The sole portion (5) includes a thin-wall portion (8) and a thick-wall portion (9) which has a greater thickness than the thin-wall portion (8). The golf club head is characterized in that a portion of the inner surface of the thick-wall portion (9), the portion facing the hollow section, has a rib (10) secured to the portion by welding.

Abstract: A hollow golf club head comprises a face portion having a club face for hitting a ball, and a club face's perimeter region extending backwards from the face portion. The perimeter region is provided with at least one set of a front part extending backwards from the face portion to have a free rear end, and a rear part extending forwards to have a free front end. The front part and the rear part are overlapped with each other without being fixed to each other so that, relatively to the rear part, the front part is movable in the front-back direction of the club head when hitting a ball.

Abstract: A golf club head comprises a head main body having a hollow therein and a weight member having a specific gravity more than that of the head main body. The head main body has a face portion for hitting a ball and a sole portion continuous from the face portion to form a bottom surface of the club head. The weight member is disposed in the hollow and extends in the toe-heel direction. In a vertical cross section of the club head including the sweet spot, the weight member is arranged without contacting with the face portion and the sole portion.

Abstract: A golf club includes a golf club head and a shaft attached to the golf club head, the golf club including the golf club head provided with a shaft insertion hole having an upper opening and a lower opening, the shaft insertion hole having an internal surface provided with an undercut groove, the shaft having a tip end, a shaft sleeve adaptor attached to the tip end of the shaft, the shaft sleeve adaptor inserted into the shaft insertion hole through the upper opening and having a first thread portion, a fastener comprising a second thread portion engaging with the first thread portion of the shaft sleeve adaptor through the lower opening of the shaft insertion hole, and a washer held in the undercut groove of the shaft insertion hole and disposed between the fastener and the shaft sleeve adaptor.

Abstract: A golf club includes a golf club head provided with a first hole and a second hole on its bottom side, a shaft, a first fastener detachably attached to the first hole to detachably fix the shaft to the golf club head, and a second fastener detachably attached to the second hole to provide weight on the golf club, the second fastener having weight different from that of the first fastener. The first fastener and the second fastener are configured as mutually replaceable fasteners so that the first fastener is detachably attached to the second hole and the second fastener is detachably attached to the first hole to detachably fix the shaft to the golf club head.

Abstract: A golf club includes a golf club head provided with a first hole and a second hole on its bottom side, a shaft detachably fixed to the golf club head, a weight member comprising a first weight member and a second weight member each detachably fixed to the golf club head, and a faster including a first fastener for fixing the shaft and the first weight member to the golf club head through the first hole, and a second fastener for fixing the second weight member to the golf club head through the second hole. The first weight member and the second weight member are configured as mutually replaceable weights so that the first weight member is fixed to the second hole using the second fastener and the second weight member is fixed to the first hole using the first fastener.

Abstract: This set 2 includes n (n is an integer equal to or greater than 2) iron golf clubs. Each of the n clubs has a rail r1 extending backward from an intermediate position in a face-back direction of a sole. When a distance d1 between a leading edge Le and a rail starting point Sr is defined as d1(1), d1(2), . . . , d1(n) in an ascending order of a real loft angle from the club having the smallest real loft angle, the set 2 satisfies the following relation: d1(1)?d1(2)? . . . ?d1(n), and d1(1)<d1(n). Preferably, the set 2 satisfies the following relation: d1(1)<d1(2)< . . . <d1(n).

Abstract: A recess 14 is formed in a sole 9 of a head 4. The recess 14 is an example of an opening part. A socket 10 is mounted to the recess 14. A weight body 12 capable of being attached/detached is attached to the socket 10. The weight body 12 has an engaging part 32 and an exposed part E1. The socket 10 has an interposition part 11. The interposition part 11 is interposed in at least a part between the exposed part E1 and a head body h1 in an attached state where the engaging part 32 is placed at an engaging position EP. The exposed part E1 is exposed to the outside in the attached state. The interposition part 11 does not fix the weight body 12.

Abstract: This set 2 includes n (n is an integer equal to or greater than 2) iron golf clubs. Each of the n clubs has a rail r1 extending backward from an intermediate position in a face-back direction of a sole. When a distance d1 between a leading edge Le and a rail starting point Sr is defined as d1(1), d1(2), . . . , d1(n) in an ascending order of a real loft angle from the club having the smallest real loft angle, the set 2 satisfies the following relation: d1(1)?d1(2)? . . . ?d1(n), and d1(1)<d1(n). Preferably, the set 2 satisfies the following relation: d1(1)<d1(2)< . . . <d1(n).

Abstract: This head 2 includes a head body h1 as a first member and a face plate p1 as a second member. A boundary k1 of the first member and the second member exists on a surface of the head. A deposition layer is formed in a region including the boundary k1 on the surface of the head. A temperature Tp in a deposition process is equal to or less than 150° C. Preferably, the deposition layer is formed by PVD. Preferably, the first member and the second member are stuck with an adhesive. Preferably, the deposition layer has a surface layer and a lower layer. Preferably, the exposed deposition layer is a TiC layer. Preferably, a total thickness Tt of the deposition layer is 0.5 ?m or greater and 3.0 ?m or less.