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www.grainger.com/category/machining/precision-measuring-tools/ring-gages

Ring gauges can help make design engineering work more exacting and can confirm pipe thread accuracy. These ring gages are used in a wide variety of industries, including machine tool, automotive, oil and gas exploration, and other metal working endeavors. Rely on Grainger for precision measuring instruments.

www.drillingtools.com/drillingacc

Thread Protectors. Drilling Tools carries a variety of thread protectors ranging from composite heavy-duty plastic to pressed steel for both internal and external pipe threads. These durable coverings offer impact protection during normal operations, transportation, handling, and storage. Additional Information

www.p1usa.com/thread-gages--1

M Series Metric thread gages are manufactured per ASME B1.16M. Standard thread gages are made to a Class X tolerance. Gages may be purchased individually or as assemblies. Plug gage assemblies are marked with the thread size, class of fit and pitch diameters. Pipe Gages per ASME B1.20.1, ASME B1.20.5 and Hole Location gages stocked.

www.prattandwhitney.com/Content/Oil_Country_Gages.asp

The National Pipe Thread Taper (NPT) is a U.S. standard for tapered threads used on threaded pipes and fittings. A taper thread will pull tight and therefore make a fluid-tight seal. NPT is defined by ANSI/ASME standard B1.20.1.

www.gagecrib.com

Best Gages - Best Prices! We take the headache out of searching for the “right gage at the right price.” Request a Ring or Plug screw thread gauge from us and we will give you the market’s lowest prices and shortest lead times. We specialize in screw thread measurement tools, gages and services, like hard to find Acme, API, Before-Coating, Before-Plate, Buttress, British, Knuckle, Left ...

www.toolflo.com

oil & gas. As industry leaders in indexable tooling specifically designed for the oil and gas industry, Tool-Flo inventories all standard thread forms including API round, API buttress, NPT/LPT, waterwell, and rotary shoulder thread forms and even offers scarfing inserts for pipe manufacturing.

www.duncanrogers.com/tools/thread.asp

NOTE: Threads can become worn and may not compare exactly to our tables. 2. Use a thread pitch gauge to determine the number of threads per inch or the distance between threads in metric connections. 3. Use the seat angle gauge to determine the angle of the sealing surface. The centreline of the fitting and the gauge should be parallel.

www.practicalmachinist.com/vb/general-archive/oil-well-drill-pipe-threads-74702

There are dozens if not hundreds of different thread forms used in the oilfield. Drilco, now Smith International used to publish a spec book with all the thread forms in use. Drillers didn't used to trust a thread cut on a manual lathe because the taper and form is so critical.

oilfieldtrash.com/custom/php/files/1252703762TECHFACT.pdf

1 3 4 6 5 7 9 8 10 2 Tool Joints Drill Pipe Drill Collars and Connections Stretch Data Tubing Data Casing Data Capacity Annular Volume Flanges and Blowout Preventers

www.practicalmachinist.com/vb/general/anyone-know-about-api-oilfield-threads...

The notation that points to the thread says "1.315 x 10NU". The part itself is called a collar, and connects long pieces of pipe that go down into the ground. (At least these people call it a collar. I've also come across the terms pin and box, but I don't know if these are just oilfield terms for the male pipe and female coupling.)