Trapezoidal thread form having a wear indicator and high pressure connection fitting comprising same

A trapezoidal thread form comprising:

• a thread having a trapezoidal cross-sectional shape, the thread including an apex surface and two side surfaces;
• and
• a thread wear indicator formed in one of the side surfaces,
• wherein the thread wear indicator is a v-shaped channel having a depth that is between 5% and 25% of a thickness of the trapezoidal thread form, and
• wherein the v-shaped channel extends radially outward from a valley, a bottom of the v-shaped channel being substantially perpendicular to a top edge of the thread form.

A trapezoidal thread form comprising:

• a thread having a trapezoidal cross-sectional shape, the thread including an apex surface and two side surfaces;
• and
• a thread wear indicator formed in one of the apex surface and one of the side surfaces,
• wherein the thread wear indicator is a layered surface that includes three layers.

A threaded connection comprising:

• a male part having an outer thread form;
• a female part having an inner thread form;
• and
• a spiral groove thread wear indicator disposed on at least one of the outer thread form and the inner thread form, the spiral groove running parallel to a top edge of the outer thread form or of the inner thread form, the top edge being formed by an intersection of an apex surface and a side surface of the outer thread form or of the inner thread form, the thread wear indicator providing a visual indication of excessive thread wear,
• wherein the thread wear indicator is a v-shaped channel having a depth that is between 5% and 25% of a thickness or height of the thread form.

A threaded connection comprising:

• a male part having an outer thread form;
• a female part having an inner thread form;
• and
• a thread wear indicator disposed on at least one of the outer thread form and the inner thread form, the thread wear indicator providing a visual indication of excessive thread wear,
• wherein the thread wear indicator is a v-shaped channel having a depth that is between 5% and 25% of a thickness or height of the thread form, and
• wherein the v-shaped channel is formed in a side surface of one of the outer thread form and the inner thread form and the v-shaped channel extends radially outward from a valley, a bottom of the v-shaped channel being oriented substantially perpendicular to a top edge of the thread form.

A threaded connection comprising:

• a male part having an outer thread form;
• female part having an inner thread form;
• and
• a thread wear indicator disposed on at least one of the outer thread form and the inner thread form, the thread wear indicator providing a visual indication of excessive thread wear,
• wherein the thread wear indicator includes at least three layers.