Product range & specifications
Reference data for the connections we quote most often. Sizes outside this list are available to order — send the string specification and we will confirm.
Core product
API 5CT casing coupling
Casing couplings are machined from seamless coupling stock, threaded to API 5B gauges and phosphate coated. Each lot is stencilled with size, grade, thread form and heat number so it can be traced back to the mill certificate.
| Size (OD) | Thread | Grade | Standard |
|---|---|---|---|
| 4-1/2" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 5" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 5-1/2" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 6-5/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 7" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 7-5/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 8-5/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 9-5/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 10-3/4" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 11-3/4" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 13-3/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 16" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 18-5/8" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
| 20" | STC / LTC / BTC | J55 · K55 · L80 · N80-Q · P110 | API 5CT |
Core product
API 5CT tubing coupling
Tubing couplings are supplied in EUE and NUE forms for production strings. Threads can be phosphated or copper plated, and couplings are shipped with protectors fitted as standard.
| Size (OD) | Thread | Grade | Standard |
|---|---|---|---|
| 1.05" | EUE / NUE | J55 · L80 · N80 | API 5CT |
| 1.315" | EUE / NUE | J55 · L80 · N80 | API 5CT |
| 1.660" | EUE / NUE | J55 · L80 · N80 | API 5CT |
| 1.900" | EUE / NUE | J55 · L80 · N80 | API 5CT |
| 2-3/8" | EUE / NUE | J55 · L80 · N80 · P110 | API 5CT |
| 2-7/8" | EUE / NUE | J55 · L80 · N80 · P110 | API 5CT |
| 3-1/2" | EUE / NUE | J55 · L80 · N80 · P110 | API 5CT |
| 4" | EUE / NUE | J55 · L80 · N80 · P110 | API 5CT |
| 4-1/2" | EUE / NUE | J55 · L80 · N80 · P110 | API 5CT |
Reference only. Weight, wall thickness and drift are confirmed against the purchase specification before quotation.
Tubulars & joints
Pup joint
Cut and threaded from the same heat as the string where required, with PIN×PIN, PIN×BOX and BOX×BOX configurations for adapting between thread forms.
Accessories
Crossover sub
Adapter subs machined from 4140 / 42CrMo bar stock, threaded to bridge two different API forms — for example casing to tubing, or STC to BTC on an old string.
Tubulars & joints
Seamless casing & tubing
API 5CT PSL1 and PSL2 seamless tubulars, supplied with matching couplings, thread protectors and mill test certificates. Hydrostatic and drift testing to the purchase specification.
Accessories
Protectors, compound & gauges
Thread protectors, API thread compound and API 5B working and reference gauges — the small items that decide whether a joint passes inspection on arrival.
Material grades
Grades & thread forms we quote
We quote the standard API grades below. Higher grades and speciality threads are available on request.
| Grade | Type | Typical service |
|---|---|---|
| H40 | Carbon steel | Shallow wells, low pressure |
| J55 | Carbon steel | Shallow to medium depth |
| K55 | Carbon steel | Medium depth |
| M65 | Carbon steel | Mild sour service |
| L80 | Carbon / 9Cr / 13Cr | Sour service, H2S |
| N80-1 / N80-Q | Carbon steel | Medium to deep, high pressure |
| C90 | Martensitic | Sour service, high strength |
| T95 | Martensitic | Sour service, high strength |
| C110 | Martensitic | Sour service, heavy wall |
| P110 | Carbon / martensitic | Deep, high pressure |
| Q125 | Carbon steel | Very high strength |
Packing & logistics
Packing & marking
Couplings are packed to survive a sea voyage and to be counted at destination without repacking.
- Hexagonal bundles or wooden pallets, steel-strapped
- Shrink wrap with mill edge protection
- Stencil marking: size, grade, thread, heat number
- Packing list matching bundle numbers to invoice lines
Need a price for a specific size?
Send the size, grade, thread form and quantity — we will come back with price, lead time and packing.