Grooved Mechanical Pipe Coupling ASTM A536 Ductile Iron 2-12 Inch

A two-bolt grooved mechanical pipe coupling that joins pipe ends in minutes — no welding, no threading, no flanges. Slide the gasket over the pipe ends, close the housing halves and tighten two bolts with a single wrench. The result is a flexible, pressure-tight joint that absorbs vibration and allows for thermal expansion, which is why grooved couplings are the standard connection method for fire sprinkler and HVAC piping systems worldwide.

• Fire sprinkler systems – wet and dry risers, branch lines, hydrant mains; grooved joints avoid hot work permits inside occupied buildings.
• HVAC and chiller plants – chilled water, condenser water and hot water loops where vibration and thermal movement must be absorbed.
• Water supply and process piping – municipal water, pump rooms, water treatment and industrial utility lines.
• Retrofit and repair work – shut down only the affected section and rejoin it with two bolts.

• Ductile iron castings produced to ASTM A536 with tensile and elongation test reports per heat number.
• Hydrostatic test at 1.5 times rated pressure, plus dimensional check of groove width and diameter.
• Gasket hardness and compression set verified batch by batch; EPDM and NBR certificates available.
• ISO 9001 quality system; third-party inspection such as SGS or BV can be arranged on request.

Each coupling is packed in a carton with the gasket and bolts, then loaded into plywood cases or plywood pallets for export. Neutral packing is standard; customer logo printing on the carton and label is available. Typical lead time is 7–20 days for standard sizes and 25 days for coated or special gasket orders.

Send us your pipe schedule and system pressure and we will confirm the matching coupling size, gasket compound and coating, then quote FOB or CIF prices within one working day.