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In this golf guide, we will go over the terms used in the golf industry to measure and adjust golf club angles, to have a detailed look at the billion market industry.


As Cast: Metallurgical state of alloy, in casting process as poured into the mold.

Bending Bar: Piece of equipment that fits over the hosel of a golf club and used for adjusting angles. Bending bars are available in many sizes and designs to accommodate various hosels.

Blind Bore: A bore configuration of metal woods in which the shaft penetrates the bore to a standard depth of 1/2” from the sole of the club head.

Bore Depth: The depth measurement of the hosel bore or shaft penetration.

Bore Type: The term used to describe how far a shaft penetrates into a club’s hosel.

Bulge: The heel to toe radius of a metal wood and hybrid club face.

Center of Gravity (CG): The center of a club head’s weight distribution.

Club Head Volume: Head size measured in cubic centimeters (cc’s) when measured by liquid displacement. See USGA Appendix II for club size limits.

C.O.R (Co-efficient of Restitution): Term used to describe the trampoline effect of the golf ball rebounding off a golf club’s face.

Dynamic Lie Marks: The imprint marks left on the sole of an iron head from an impact board.

Droop: Term used to describe the bending down of the golf shaft perpendicular to the ground when a club is swung.

Face Attitude: The orientation of the club’s face to its forward pointing direction.

Face Angle: Face Angle is the angle formed by the shaft plane to the square face plane with no sole influence. When viewed in a playing position, face angle is the angle formed by the club’s face plane (open, square, closed) and the shaft plane when the club head is soled in it’s natural lie angle position.

Gear Effect: Term used to describe the effect of face bulge of a metal wood when a ball is hit more on the toe or heel, which causes the ball flight to curve back towards the target.

Geometry: The mathematical study of the properties of, and relations between, points, lines, angles, surfaces and solids in space. NOTE: Angles are constant when measured from parallel planes.

Heat Treating: Precipitation Hardening process by which stainless steels used in cast golf club heads are hardened for corrosion resistance, yield strength, wear resistance and ductility.

Horizontal Face Plane (Attitude): The horizontal registration of the score lines of a golf club’s face.

Hosel: The entry point of the shaft into the head on any golf club.

Leading Edge: The forward most point of the club’s face.

Lie Angle: The angle formed between the shaft plane and the horizontal face plane (attitude).

Loft Angle: The angle formed by the shaft plane and the pitch of the face.

M1 Bore: Bore type in a wood in which there is 1.5” from the ground line to the point at which the shaft bottoms out in the hosel.

M2 Bore: Type of wood bore in which the shaft bottoms out in the hosel 1-inch from the ground line.

Metal Wood Bore: The bore configuration of a type of metal wood head in which the distance from the ground line to the bottom of the bore is 1 1/2 inches.

Off-set: The distance from the forward edge of the hosel to the leading edge of the club’s face, which is trailing the hosel.

On-set: The distance from the forward edge of the hosel to the leading edge of the club’s face, which is forward of the hosel.

Progressive Offset: An incrementally progressive amount of offset designed into a set of irons with the longer irons having more and the shorter irons having less.

Rockwell Hardness: An alpha/numeric scale used to grade metal hardness based on the composition of the steel alloy. Forged carbon steel irons are typically B80 while cast stainless steel heads are; 431/C18, 17-4/C35 and maraging steel is C45.

Score Lines: Grooves on a club’s face.

Standards: A model to be followed or imitated.

Trailing Edge: The most rearward edge of a club ‘s sole.

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