A golf club head that is capable improving on the inertia properties of a golf club head all while also improving the Center of Gravity (CG) location is disclosed herein. More specifically, the golf club head in accordance with the present invention achieves a relative low Moment of Inertia (MOI) about the Z-axis (MOI-Z) as well as a relatively low MOI about the Shaft-axis (MOI-SA), all combined with a high MOI about the X and Y-axis (MOI-X and MOI-Y) and maintaining a consistently and relatively low CG location measured along a direction tangent to the hosel axis along the X-Y plane (CG-B). The golf club head includes a frontal portion and a rear portion, each including one or more cantilevered extensions and one or more elongate protrusions that collectively constitute a snap fit mechanism adapted to removably couple the frontal portion to the rear portion.

An iron-type golf club has a body that defines a rear void. The face portion includes an ideal striking location that defines the origin of a coordinate system. The body includes a central region in which −25 mm<x<25 mm. The sole portion that is contained within the central region includes a forward sole region located adjacent to the face portion and a sole bar located rearward of the forward sole region, with the forward sole region defining a wall having a minimum forward sole thickness T.sub.FS and the sole bar defining a body having a maximum sole bar thickness T.sub.SB, such that 0.05<T.sub.FS/T.sub.SB<0.4. The sole portion includes a slot extending in a substantially heel-to-toe direction of the sole portion, the slot defining a portion of a path that extends through the sole portion and into the rear void. The slot is at least partially filled with a filler material.

Disclosed herein is an iron-type golf club head. The iron-type golf club head comprises a body, having a density of less than 8 grams-per-cubic-centimeter (g/cc). The body comprises a heel portion, a toe portion, a sole portion, a top portion, and a front portion. The body also comprises 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. The iron-type golf club head also comprises 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.

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.

Embodiments of golf club heads with apertures and methods to manufacture golf club heads are generally described herein. Other embodiments may be described and claimed.

Embodiments of golf club heads with apertures and methods to manufacture golf club heads are generally described herein. Other embodiments may be described and claimed.

Methods of manufacturing a golf club head with one or more stiffening members proximate the face, and particularly solid rods or a plate with one or more cutouts, is disclosed herein. One method includes the steps of preparing a wax mold of a golf club head including a plate stiffening member with excess material, casting the golf club head, and machining away the excess material. Another method includes the steps of casting a golf club body, providing a plate stiffening member, providing a face component such as a face cup, tack welding the plate stiffening member and the face component to the golf club body, and welding these parts together.

A golf club head, preferably a putter head, comprising at least one structural support member is disclosed herein. The structural support member has a smooth, organic-looking aesthetic, with a continuously changing curvature along its spline and at least one surface, and preferably connects one portion of the golf club head to another portion. Where the support member connects to other portions of the golf club head, the surfaces of the member have a curvature that changes smoothly and continuously, lacking any sharp corners. The support member may be part of a lattice structure formed via binder jetting.

An iron-type golf club incorporating an aperture extending through the shell on the sole. The location and size of the aperture selectively increase deflection of the face.

A hockey stick blade cover comprises a viscoelastic sleeve that may be coupled to a hockey stick blade, wherein a friction force between the viscoelastic sleeve and the hockey stick blade retains the viscoelastic sleeve on the blade. The viscoelastic sleeve comprises a self-healing material. In some embodiments, the sleeve comprises a vitrimer elastomer. In some embodiments, the sleeve comprises a composite material, such as including one or more selected from a group of natural fibers, synthetic fiber, boron nitride nanotubes, carbon nanotubes, and graphene. The hockey stick blade cover is typically attached to the hockey stick blade by expanding the viscoelastic sleeve, sliding the expanded viscoelastic sleeve over the blade, from the toe of the blade toward the heel of the blade, and then releasing the viscoelastic sleeve, thereby allowing the viscoelastic sleeve to contract. A pre-taped hockey stick comprises a viscoelastic wrap that is pre-coupled to the blade.