Abstract: Golf club heads are described having a club head portion, a shaft portion connected to the club head portion, and a grip portion connected to the shaft portion. The club head portion has a heel portion, a sole portion, a toe portion, a crown portion, a hosel portion, and a striking face. The striking face can have a center face roll contour, a toe side roll contour, a heel side roll contour, a center face bulge contour, a crown side bulge contour, and a sole side bulge contour. The toe side roll contour can be more lofted than the center face roll contour. The heel side roll contour can be less lofted than the center face roll contour. The crown side bulge contour can be more open than the center face bulge contour, and the sole side bulge contour can be more closed than the center face bulge contour.

Abstract: An iron-type golf club head has a hosel portion, a heel portion, a sole portion, a toe portion, a topline portion, and a striking face including a center face location. A toe side topline-to-sole contour of the striking face is more lofted than a center face topline-to-sole contour of the striking face, a heel side topline-to-sole contour of the striking face is less lofted than the center face topline-to-sole contour, a topline side toe-to-heel contour of the striking face is more open than a center face toe-to-heel contour of the striking face, and a sole side toe-to-heel contour of the striking face is more closed than the center face toe-to-heel contour. The toe side topline-to-sole contour, the center face topline-to-sole contour, the heel side topline-to-sole contour, the topline side toe-to-heel contour, the center face toe-to-heel contour, and the sole side toe-to-heel contour are straight line contours.

Abstract: Golf club heads are described having a club head portion, a shaft portion connected to the club head portion, and a grip portion connected to the shaft portion. The club head portion has a heel portion, a sole portion, a toe portion, a crown portion, a hosel portion, and a striking face. The striking face can have a center face roll contour, a toe side roll contour, a heel side roll contour, a center face bulge contour, a crown side bulge contour, and a sole side bulge contour. The toe side roll contour can be more lofted than the center face roll contour. The heel side roll contour can be less lofted than the center face roll contour. The crown side bulge contour can be more open than the center face bulge contour, and the sole side bulge contour can be more closed than the center face bulge contour.

Abstract: Golf club heads are described having a club head portion, a shaft portion connected to the club head portion, and a grip portion connected to the shaft portion. The club head portion has a heel portion, a sole portion, a toe portion, a crown portion, a hosel portion, and a striking face. The striking face can have a center face roll contour, a toe side roll contour, a heel side roll contour, a center face bulge contour, a crown side bulge contour, and a sole side bulge contour. The toe side roll contour can be more lofted than the center face roll contour. The heel side roll contour can be less lofted than the center face roll contour. The crown side bulge contour can be more open than the center face bulge contour, and the sole side bulge contour can be more closed than the center face bulge contour.

Abstract: An iron-type golf club head has a hosel portion, a heel portion, a sole portion, a toe portion, a topline portion, and a striking face including a center face location. A toe side topline-to-sole contour of the striking face is more lofted than a center face topline-to-sole contour of the striking face, a heel side topline-to-sole contour of the striking face is less lofted than the center face topline-to-sole contour, a topline side toe-to-heel contour of the striking face is more open than a center face toe-to-heel contour of the striking face, and a sole side toe-to-heel contour of the striking face is more closed than the center face toe-to-heel contour. The toe side topline-to-sole contour, the center face topline-to-sole contour, the heel side topline-to-sole contour, the topline side toe-to-heel contour, the center face toe-to-heel contour, and the sole side toe-to-heel contour are straight line contours.

Abstract: 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 forty 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 forty molds. Each mold of the at least forty molds is configured to receive molten metal from a corresponding one of the main gates and to cast a body of an iron-type golf club head.

Abstract: 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 cm3.

Abstract: Golf club heads are described having a club head portion, a shaft portion connected to the club head portion, and a grip portion connected to the shaft portion. The club head portion has a heel portion, a sole portion, a toe portion, a crown portion, a hosel portion, and a striking face. The striking face can have a center face roll contour, a toe side roll contour, a heel side roll contour, a center face bulge contour, a crown side bulge contour, and a sole side bulge contour. The toe side roll contour can be more lofted than the center face roll contour. The heel side roll contour can be less lofted than the center face roll contour. The crown side bulge contour can be more open than the center face bulge contour, and the sole side bulge contour can be more closed than the center face bulge contour.

Abstract: An iron-type golf club head has a hosel portion, a heel portion, a sole portion, a toe portion, a topline portion, and a striking face including a center face location. A toe side topline-to-sole contour of the striking face is more lofted than a center face topline-to-sole contour of the striking face, a heel side topline-to-sole contour of the striking face is less lofted than the center face topline-to-sole contour, a topline side toe-to-heel contour of the striking face is more open than a center face toe-to-heel contour of the striking face, and a sole side toe-to-heel contour of the striking face is more closed than the center face toe-to-heel contour. The toe side topline-to-sole contour, the center face topline-to-sole contour, the heel side topline-to-sole contour, the topline side toe-to-heel contour, the center face toe-to-heel contour, and the sole side toe-to-heel contour are straight line contours.

Abstract: An iron-type golf club head has a hosel portion, a heel portion, a sole portion, a toe portion, a topline portion, and a striking face including a center face location. A toe side topline-to-sole contour of the striking face is more lofted than a center face topline-to-sole contour of the striking face, a heel side topline-to-sole contour of the striking face is less lofted than the center face topline-to-sole contour, a topline side toe-to-heel contour of the striking face is more open than a center face toe-to-heel contour of the striking face, and a sole side toe-to-heel contour of the striking face is more closed than the center face toe-to-heel contour. The toe side topline-to-sole contour, the center face topline-to-sole contour, the heel side topline-to-sole contour, the topline side toe-to-heel contour, the center face toe-to-heel contour, and the sole side toe-to-heel contour are straight line contours.

Abstract: Golf club heads are described having a club head portion, a shaft portion connected to the club head portion, and a grip portion connected to the shaft portion. The club head portion has a heel portion, a sole portion, a toe portion, a crown portion, a hosel portion, and a striking face. The striking face can have a center face roll contour, a toe side roll contour, a heel side roll contour, a center face bulge contour, a crown side bulge contour, and a sole side bulge contour. The toe side roll contour can be more lofted than the center face roll contour. The heel side roll contour can be less lofted than the center face roll contour. The crown side bulge contour can be more open than the center face bulge contour, and the sole side bulge contour can be more closed than the center face bulge contour.

Abstract: A golf club head having a connection assembly with a non-metallic component possessing unique relationships that offer increased durability, weight sayings, and reduced manufacturing costs.

Abstract: A golf club head having a connection assembly with a non-metallic component possessing unique relationships that offer increased durability, weight sayings, and reduced manufacturing costs.

Abstract: A golf club head connection assembly having a non-metallic component possessing unique relationships that offer increased durability, weight savings, and reduced manufacturing costs.

Abstract: A golf club head connection assembly having a non-metallic component possessing unique relationships that offer increased durability, weight savings, and reduced manufacturing costs.

Abstract: Investment-casting shells are disclosed that have at least one cluster of individual club-head casting molds for casting thin-walled, steel or steel-alloy club-heads at high process yield and low material usage. The shells have respective combinations of cluster configuration and number, gating, and runners, as determined systematically. Some shell configurations include a cluster of at least ten casting molds for respective club-heads each (a) having a head-volume less than 400 cm3, (b) defining at least one club-head wall having a thickness of less than 0.8 mm, and (c) defining at least one respective gate. The cluster is configured to produce a cast-product yield of greater than 80% at a material usage of less than 1,000 g, including process losses, per cast club-head. Also, at least one runner connects the gates together.

Abstract: Certain disclosed embodiments concern making sports equipment, such as golf club heads, using polishing marks to facilitate removing material from as-cast work pieces to produce a final thickness within a desired specification, such as 0.6 millimeter or less ±0.05 millimeter. At least one polish mark, more typically plural polish marks, is formed into an outer surface of an as-cast article to a depth selected to provide a final product thickness subsequent to polishing that is ±0.05 millimeter of a final desired thickness. The golf club head or component is then polished at least once to remove club head material substantially corresponding to the depth of the at least one polish mark. The method may further comprise joining the club head to a shaft.

Abstract: Certain disclosed embodiments concern making sports equipment, such as golf club heads, using polishing marks to facilitate removing material from as-cast work pieces to produce a final thickness within a desired specification, such as 0.6 millimeter or less ±0.05 millimeter. At least one polish mark, more typically plural polish marks, is formed into an outer surface of an as-cast article to a depth selected to provide a final product thickness subsequent to polishing that is ±0.05 millimeter of a final desired thickness. The golf club head or component is then polished at least once to remove club head material substantially corresponding to the depth of the at least one polish mark. The method may further comprise joining the club head to a shaft.

Abstract: Certain disclosed embodiments concern making sports equipment, such as golf club heads, using polishing marks to facilitate removing material from as-cast work pieces to produce a final thickness within a desired specification, such as 0.6 millimeter or less±0.05 millimeter. At least one polish mark, more typically plural polish marks, is formed into an outer surface of an as-cast article to a depth selected to provide a final product thickness subsequent to polishing that is ±0.05 millimeter of a final desired thickness. The golf club head or component is then polished at least once to remove club head material substantially corresponding to the depth of the at least one polish mark. The method may further comprise joining the club head to a shaft.

Abstract: Investment-casting shells are disclosed that have at least one cluster of individual club-head casting molds for casting thin-walled, titanium alloy club-heads at high process yield and low material usage. The shells have respective combinations of cluster configuration and number, gating, and runners, as determined systematically. Some shell configurations include a cluster of at least ten casting molds for respective club-heads each (a) having a head-volume greater than 400 cm3, (b) defining at least one club-head wall having a thickness of less than 0.8 mm, and (c) defining at least one respective gate. The cluster is configured to produce a cast-ptoduct yield of greater than 80% at a material usage of less than 600 g, including process losses, per cast club-head. Also, at least one runner connects the gates together.