Disclosed herein is a casting cluster for casting a body of a golf club head made of titanium or a titanium alloy. The casting cluster comprises a receptor and a plurality of runners coupled to the receptor and configured to receive molten metal from the receptor. The casting cluster also includes at least twenty-eight main gates. At least two of the main gates are coupled to each of the runners and each main gate is configured to receive molten metal from a corresponding one of the plurality of runners. The casting cluster further comprises at least twenty-eight molds. Each mold of the at least twenty-eight molds is configured to receive molten metal from a corresponding one of the main gates and to cast a body of a golf club head that has a volume of at least 100 cm.sup.3.

Examples of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a body portion having a sole portion with a set of weight ports. Each weight port may have a first section and a second section. Each weight portion from a first set of weight portions may be adhered to the first section of a corresponding weight port by epoxy. Each weight portion from a second set of weight portions may be fastened to the second section of a corresponding weight port. At least a portion of the weight portions of the first set of weight portions may be interchangeable. At least a portion of the weight portions of the second set of weight portions may interchangeable. Other examples may be described and claimed.

A high characteristic time golf club incorporating a shaft connection system socket extending from the bottom portion of the golf club head into the interior of the outer shell toward the top portion of the club head.

A high characteristic time golf club incorporating a shaft connection system socket extending from the bottom portion of the golf club head into the interior of the outer shell toward the top portion of the club head.

A ball striking device, such as a golf club head, includes a face having a ball striking surface, an inner surface opposite the ball striking surface, and a thickness defined between the ball striking surface and the inner surface, and a body connected to the face and extending rearward from the face. The face has a modulus gradient across the thickness of the face, such that the modulus of the face varies at different distances from the ball striking surface. The face may also include at least one of an insert, a composite material, a multi-layered structure, and/or a portion treated by a surface treatment to contribute to the modulus gradient.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a body portion having an interior cavity, a port connected to the interior cavity, a toe portion, a heel portion, a top portion, a sole portion, a back portion, a port, and a front portion having a perimeter ledge portion defining at least a portion of an outer boundary of the front portion. The example golf club head may also include a face portion having a front surface with at least one groove and a back surface opposite the front surface and associated with a total back surface area. The back surface may include a first back surface region associated with a first back surface area and a second back surface region associated with a second back surface area. The total back surface area may equal to the sum of the first back surface area and the second back surface area. The first back surface region may be located at or proximate to a perimeter portion of the back surface and coupled to the perimeter ledge portion. Other examples and embodiments may be described and claimed.

A golf club has a first shaft coupled to a club head, a second shaft configured to slidably engage a portion of the first shaft, a grip coupled to the second shaft, and an adjustable length shaft assembly received by the second shaft and configured to allow a portion of the first shaft to slide in relation to the second shaft in a first configuration, and to restrict a portion of the first shaft from sliding in relation to the second shaft in a second configuration. The grip is restricted from rotation about the first shaft or the second shaft as the first shaft slides in relation to the second shaft.

The invention described herein is an iron-type golf club head having an optimized mass distribution while also having the aesthetics of a full muscle-back iron. The iron-type golf club head comprises a main club head body, a lightweight, back-cavity insert, and a void within the lightweight, back-cavity insert configured to receive a CTP weight capable of adjusting mass characteristics of the iron-type golf club head.

A golf club head includes a body having a heel portion, a toe portion, a sole portion, and an outer surface, a strikeface having a geometric center, a head center of gravity, and a weight member including a weight pad. The weight member is configured to be repositionable by the user to a first position or a second position. The club head having the weight member in the first position shifts the head center of gravity toward the strikeface, and the club head having the weight member in the second position shifts the head center of gravity away from the strikeface.

A hollow golf club head comprising a first component and a second component. The first component comprises a crown return extending rearwardly from a strikeface and forming a portion of a crown; a sole return extending rearwardly from the strikeface and forming a portion of a sole; a sole extension extending rearwardly from the sole return; and a back rail connected to the sole sections. The back rail comprises a top wall, a rear wall, and a lip, which together define a channel extending along the back rail in a heel to toe direction. The second component comprises a heel side wing and a toe side wing that extend from the crown to the sole around a heel end of the club head. The channel is configured to receive a weight portion. The first component comprises a majority of the overall mass of the golf club head.