Rigid and flexible couplings, elbows and tees for wholesale piping orders
Complete grooved coupling kits join the matching pipe ends; ductile iron elbows and tees provide the changes in direction and branch connections. Our range keeps coupling type, pipe outside diameter and gasket requirements together so the joint components fit the same assembly.
Rigid coupling kits are supplied for the restrained joints on the approved layout. The rigid style remains a separate item from a flexible kit at the same pipe OD.
A flexible design allows controlled movement within the limits of its selected model. The permitted end separation and deflection belong to that model’s data sheet. A flexible coupling does not replace an engineered expansion or seismic arrangement.
Grooved elbows turn the line through 90 degrees. Equal tees add a same-size branch. Short and standard patterns have different center-to-end dimensions, so the pattern remains part of the item description.
| Fitting material | Ductile iron; ASTM A536 Grade 65-45-12 for the elbow and tee series |
|---|---|
| Core selection | 2–8 in. couplings, 90° elbows and equal tees |
| Coupling kit | Two housing halves, one gasket, two bolts and two nuts |
| Finish options | Red paint, epoxy coating or hot-dip galvanized |
| Fitting patterns | Short and standard center-to-end dimensions |
| Order basis | Kits for couplings; pieces for elbows and tees |
Find the pipe outside diameter first, then select the coupling style.
| Nominal size (in.) | DN | Pipe OD (mm) | Bolt quantity × size (mm) | Catalog pressure rating (psi) |
|---|---|---|---|---|
| 2 | 50 | 60.3 | 2 × M10 × 55 | 300 |
| 2-1/2 | 65 | 73.0 | 2 × M10 × 55 | 300 |
| 3 | 80 | 88.9 | 2 × M10 × 60 | 300 |
| 4 | 100 | 114.3 | 2 × M12 × 65 | 300 |
| 5 | 125 | 141.3 | 2 × M12 × 75 | 300 |
| 6 | 150 | 168.3 | 2 × M12 × 75 | 300 |
| 8 | 200 | 219.1 | 2 × M16 × 85 | 300 |
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These rows cover the selected 300 psi coupling series. The accepted joint rating also depends on the pipe, groove, gasket and service conditions. Bolt lengths are given in millimeters; they are not tightening-torque values.
The 2½ in. selection above fits 73.0 mm OD pipe. A 76.1 mm product may also carry a DN65 designation, but it is a different outside-diameter series. The same distinction applies to 114.3 versus 108.0 mm and 168.3 versus 165.1 mm.
| Nominal size (in.) | Pipe OD (mm) | Short L (mm) | Standard L (mm) |
|---|---|---|---|
| 2 | 60.3 | 70 | 83 |
| 2-1/2 | 73.0 | 76 | 95 |
| 3 | 88.9 | 90 | 108 |
| 4 | 114.3 | 102 | 127 |
| 5 | 141.3 | 122 | 140 |
| 6 | 168.3 | 140 | 165 |
| 8 | 219.1 | 175 | 197 |
L is measured from the intersection of the pipe centerlines to the fitting end. At 4 in., the short pattern is 102 mm and the standard pattern is 127 mm. Keep the selected pattern on the fabrication drawing and purchase order.
| Nominal size (in.) | Pipe OD (mm) | Short L (mm) | Standard L (mm) |
|---|---|---|---|
| 2 | 60.3 | 70 | 83 |
| 2-1/2 | 73.0 | 76 | 95 |
An equal tee has the same nominal size at all three ends. The table covers the two stated sizes; larger tee takeouts follow the selected product drawing.
The selected coupling profile sets the groove diameter, width and distance from the pipe end. The gasket seat remains clear and ready for the supplied seal.
A rolled groove displaces the pipe wall; a cut groove removes material. The pipe wall and coupling instructions determine which preparation is permitted. We keep the ordered groove profile tied to the fitting schedule.
The area between the groove and pipe end is the gasket seat. Burrs, coating buildup or surface damage there affect the seal even when the groove itself has the correct dimensions.
Coupling designs use different bolt-pad conditions and tightening procedures. The supplied instructions identify the method for the selected model; there is no single torque value for every size and style.
Matching nominal sizes do not establish system compatibility. Housing geometry, gasket profile, pipe groove and approval conditions must be checked together before substituting a coupling or seal.
Where service access affects joint placement, review the grooved coupling guide for mechanical rooms.
Grooved pipe can be included with the fitting order. The pipe item retains its wall schedule and groove specification, and the coupling kit is listed separately from the pipe length.
Each offered kit names its gasket compound and coupling model. The gasket data supplied with the offer identifies the intended fluid and temperature limits, so a buyer can compare complete assemblies rather than a housing alone.
Oil-service assemblies are separate from the water-service selection. The offer identifies the proposed elastomer and its published service limits; a water-service EPDM seal is not substituted for a petroleum-compatible seal.
The gasket profile and approvals must cover the specified dry or preaction service. A seal chosen for an ordinary wet system is not automatically the right assembly for every air or low-temperature condition.
Spare seals are ordered against the coupling model, OD and compound. Rubber color alone does not identify the grade or prove that two gaskets have the same profile.
Checks cover the bore, grooved ends and center-to-end dimensions of the ordered pattern. Housing keys and bolt pads are checked for visible defects before the kit is packed.
The gasket compound and profile stay linked to the coupling model. Bolt diameter, length and nut quantity are checked against the kit list, including separate spares.
Red coating and galvanized finishes remain separate order items. Inspection covers exposed surfaces, handling damage and the condition of areas that contact the gasket or mating components.
A UL- or FM-specified offer identifies the manufacturer, coupling model, size and rated configuration, with the applicable record in its submittal. The kit, gasket and required documents are listed together before acceptance.
Count one coupling kit for each grooved joint. An elbow joined to separate pipes at both ends uses two kits; an equal tee joined at all three ends uses three. Count shared joints once when preparing the complete takeoff.
Rigid and flexible kits are packed and identified separately. Elbows and tees retain their nominal size, actual OD and pattern on the item list. Cartons and wooden packing protect coatings and keep small kit parts together.
Our quotation separates coupling kits, fitting pieces and spare seals or fasteners. It states the batch quantities, production timing and shipment terms for the destination, with any special finish or documentation included in the scope.
Yes. A mechanical tee clamps around a prepared hole in the main pipe. Specify the run OD, outlet size and connection type. Its hole preparation and installation dimensions follow the selected model’s drawing; it is a different fitting from a three-ended grooved tee.
Yes. A drawing or schedule with nominal sizes, pipe ODs, fitting types and quantities gives us the starting point. We return an itemized list that identifies coupling styles and any missing service details.
Yes. A threaded outlet is identified by run size, branch size and thread form. It remains separate from an all-grooved equal tee so the branch connection is clear on the supply list.
Yes. The sample scope identifies the coupling style, pipe OD, gasket and finish. The agreed bulk-order specification remains tied to that assembly and its product records.
Send the fitting types, pipe ODs, coupling styles and quantities, together with the fluid, temperature, finish and delivery destination. Attach your takeoff or drawing for an itemized supply quote.