Tubing Couplings — The Largest Family in the Catalogue

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Couplings in the catalogue: 26 of 71 entries

Of the 71 entries in the company's catalogue, 26 are couplings — more than casing, tubing and pup joints combined. That weighting is a catalogue fact, stated as such: couplings are the largest family in this catalogue — twenty-six entries — and are ordered as their own lines, separately from the pipe.

Published stock sizes for couplings run 1.315, 1.66, 1.9, 2-3/8, 2-7/8, 3-1/2, 4 and 4-1/2 in. Named catalogue entries include N80 and L80 tubing couplings, 2-7/8 in EUE couplings held in stock, extended-length tubing couplings, special-clearance couplings, copper-plated anti-galling couplings and couplings finished with a 20-degree chamfer. Thread forms follow API Spec 5CT and 5B for dimensions and tolerances, as stated on the company's coupling product pages.

Forms: EUE, NUE and special clearance

In short: EUE puts more metal at the threaded end, while NUE and special-clearance forms keep the coupling outside diameter smaller. Neither is universally better — state the casing programme and the expected workover frequency in the enquiry, and the form is confirmed for the line in the quotation. What is universal is gauging discipline: couplings are threaded and inspected so that pin and box meet the same API gauge practice.

Finish and inspection, as described by the factory

The company's coupling pages describe a consistent process: internal and external surfaces phosphated, magnetic particle inspection carried out, and marking applied in accordance with API Spec 5CT, with a protective coating available on request. That is the process as the factory describes it; this page adds no performance claim to it. Separately, the catalogue lists copper-plated anti-galling couplings in the coupling family. Coupling production can be processed to PSL1, PSL2 or PSL3 requirements; state the level your order needs in the enquiry, and ask for the inspection and documentation scope for that level to be confirmed in the quotation.

Packing is in cartons, wooden cases or pallets, or as agreed. For stockist orders, ask for size and grade segregation by crate and marking that survives outdoor storage; for rig-direct orders, ask for the packing list to follow string order.

Which coupling sizes are held as stock items?

The company names stock sizes from 1.315 in to 4-1/2 in and describes common coupling sizes as stocked. Current availability by grade and thread form is confirmed in the quotation; stock moves, and the quotation states the position for the grades and forms you name.

Can you make couplings in a grade not listed with a size?

Coupling grades in the catalogue include J55, K55, N80, L80 and P110 across the family. State the exact grade; any other grade combination — including couplings for 13Cr strings — is confirmed in writing before order.

Do you supply casing couplings as well as tubing couplings?

Yes. The catalogue lists casing couplings and tubing couplings as two product names within the same coupling family. State the size, grade and thread form for the casing coupling line in the enquiry, and ask for it to be confirmed in the quotation.