9 Machined Features
Machined Features
- BEVEL
- BOSS
- CHAMFER
- COUNTERBORE
- COUNTERSINK
- DOVETAIL
- FILLET
- KERF
- KEYWAY
- KEYSEAT
- KNURL
- LUG
- NECK
- PAD
- ROUND
- SPLINE
- SPOTFACE
- T-SLOT
The machined features in this section are common terms related to basic industry processes. These terms are often found on prints. For a better understanding of these processes, look at the models of machined features in the Print Reading Lab.
Bevel
A surface cut at an angle. In regard to welding, a bevel will normally end up being a surface prep for a weld.

Boss
A circular pad on forgings or castings, which project out from that body of the part. The surface of the boss is machined smooth for a bold head to seat on and it has a hole drilled through to accommodate the bolt shank.

Chamfer
A process of cutting away a sharp external corner or edge. Not for welding.

Counterbore
To enlarge drilled hole to a given diameter and depth. Usually done for recessing a bolt head.

Countersink
To machine a conical depression in a drilled hole for recessing flathead screws or bolts.

Dovetail
A slot of any depth and width, which has angled sides.

Quiz
Directions: Name the machined features shown below.

Fillet
A small radius filling formed between the inside angle of two surfaces.

Kerf
The narrow slot formed by removing material while sawing or other machining.

Keyway
A narrow groove or slot cut in the shaft hole of a sleeve or hub for accommodating a key.
Keyseat
A narrow groove or slot cut in a shaft for accommodating a key.

Knurl
To uniformly roughen with a diamond or straight pattern a cylindrical or flat surface.

Lug
A piece projecting out from the body of a part. Usually rectangular in cross section with a hole or slot in it.

Neck
To machine a narrow groove on a cylindrical part or object.

Quiz
Directions: Name the machined features shown below. Check your answer.

Additional features and shapes.
Pad
A slightly raised surface projecting out from the body of a part. The pad surface can be of any size or shape. (Remember, bosses can only be round)

Round
A small radius rounded outside corner formed between two surfaces.

Spline
A gear-like serrated surface on a shaft. Take the place of a key when more torque strength is required.

Spotface
A round surface on a casting or forging for a bold head. Usually about 1/16” deep.

T-Slot
A slot of any dimensions to resemble a “T”.

Quiz
Directions: Name that machined features shown below. Check your Answers.
