Chevron right

API & Semi-Premium

PTC's superior threading capabilities include, Semi-Premium & API Certified Threads for OCTG, PMC & Mori Seiki machines, meeting API 5CT, 5L, and 5B standards.


PTC offers a complete range of Semi-Premium and American Petroleum Institute (API) premium certified thread types, including buttress thread casing (BC), long round thread casing (LC), and short round thread casing (SC) thread types. All our API connections meet or exceed API specifications, and our manufacturing facility is API 5CT and API 5L licensed. We provide API threading of OCTG in the following sizes: ERW casing OD dimensions from 4.5” OD to 9.625”.

PTC utilizes high speed PMC threaders, and Mori Seiki threading machines to produce API threads that conform to API Specification API 5B, “Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads.  

PTC threading process ensures that our threading complies with all API requirements including crest diameter, thread height, lead, taper, stand-off, and thread length. We also visually inspect the threads for any machining irregularities or damage to the threads.

Related Products

Electrical Resistance Welded (ERW Casings) for OCTG

PTC leads in ERW pipe for OCTG, crafting high-grade pipes in Liberty, Texas with advanced NDT, uniform thickness, and robust performance.

Learn more


Phased Array Ultrasonic Inspection


PTC, a leader in ERW pipe production for downhole casing, offers up to 9.625” OD in various grades and threads, featuring advanced testing and uniform thickness.

Learn more


OCTG Products Overview

PTC has years of experience producing pipe and tube calibrated to the specific needs of the oil and gas industry.

Learn more