Iron golf club head

An iron-type golf club head, comprising:

• a body, having a density of less than 8 grams-per-cubic-centimeter (g/cc) and comprising:
• a heel portion;
• a toe portion;
• a sole portion;
• a top portion;
• a front portion, comprising a strike face;
• and
• a rear portion, comprising:
• an insert shelf, adjacent the sole portion and extending from the toe portion to the heel portion;
• and
• a retention bar, integrally formed with a portion of the insert shelf and circumferentially closing the portion of the insert shelf to define a first insert channel;
• and
• a high-density insert, having a density of greater than 7.5 g/cc, supported by the insert shelf, and retained within the first insert channel by the retention bar,
• wherein:
• the rear portion further comprises a retention flap, spaced apart from the insert shelf and from the retention bar;
• the retention flap at least partially circumferentially closes the insert shelf to define a second insert channel;
• and
• the high-density insert is retained within the second insert channel by the retention flap.

An iron-type golf club head, comprising:

• a hosel;
• a body, integrally formed with the hosel, made of a titanium alloy, and comprising a front portion, having a strike face, a sole portion, and a rear portion, opposite the front portion;
• and
• a high-density insert made of a tungsten alloy and coupled to an exterior of the rear portion of the body;
• wherein:
• a thickness of the front portion, defining the strike face, is between 2.2 mm and 3.6 mm;
• the iron-type golf club head has coefficient of restitution (COR) change value of between −0.00001 and 0.025, the COR change value being defined as a difference between a measured COR value of the iron-type golf club head and a United States Golf Association (USGA)-governed calibration plate COR value;
• a center of gravity of the iron-type golf club head is no more than between 11 mm and 21 mm from a ground plane when the iron-type golf club head is at a proper address position on the ground plane;
• a blade length of the body is less than or equal to 82 mm;
• an overall width of the sole portion is less than or equal to 25.5 mm;
• the strike face comprises a leading edge;
• an offset between the hosel and the leading edge of the strike face is less than or equal to 4.5 mm;
• the body further comprises a heel portion and a toe portion;
• the rear portion comprises:
• an insert shelf, adjacent the sole portion and extending from the toe portion to the heel portion;
• and
• a retention bar, integrally formed with a portion of the insert shelf and circumferentially closing the portion of the insert shelf to define a first insert channel;
• and
• the high-density insert is supported by the insert shelf and retained within the first insert channel by the retention bar.

An iron-type golf club head, comprising:

• a body, having a density of less than 8 grams-per-cubic-centimeter (g/cc) and comprising:
• a heel portion;
• a toe portion;
• a sole portion;
• a top portion;
• a front portion, comprising a strike face;
• and
• a rear portion, comprising a first retention bar located at a toeward position and a second retention bar located at a heelward position;
• and
• a high-density insert, having a density of greater than 7.5 g/cc, coupled to the rear portion of the body, and restrained from movement in a front-to-rear direction by the first retention bar and the second retention bar;
• wherein the high-density insert defines a first exterior surface of the iron-type golf club head at the toe portion of the body and a second exterior surface of the iron-type golf club head at the rear portion of the body;
• and
• wherein the first exterior surface and the second exterior surface are separated by the first retention bar and the first retention bar defines a third exterior surface of the iron-type golf club head.