API NC50. The set offers seven files in iges format to choose from.

Four files (pin), differing in configuration of the base of the pin:

• File PIN NC50 cone.igs - 3D model with a conical shape of the nipple base
• File PIN NC50 cyl.igs - 3D model with cylindrical shape of the nipple base
• File PIN NC50 narrow relief groove.igs - 3D model with a discharge groove width of ¾ inch (API recommendation)
• File PIN NC50 wide relief groove.igs - 3D model with a 1-inch wide discharge groove (API standard)

Three files (box), differing in the shape of the relief elements:

• File BOX NC50 cone.igs - 3D model without relief elements
• File BOX NC50 boring.igs - 3D model with relief boring
• File BOX NC50 groove.igs - 3D model with relief groove