DIN 3870 Coupling Nut Assembly Tee Union

The DIN 3870 coupling nut assembly Tee Union provides a dependable, 3-way tube-to-tube connection designed specifically for high-frequency automatic lubrication and centralized grease systems. Featuring an identical, symmetric connection profile on all three ends, this equal T-shaped union splits or merges separate metric lines of the exact same diameter, branching lines efficiently across complex machinery without causing pressure drops or restriction in flow.

As a dedicated global OEM and bulk supplier, our production facilities employ high-precision equipment to guarantee perfectly matched internal boring and strict multi-directional alignment across all three entry ports. Every batch is pressure-validated to survive the harsh mechanical pulses generated by progressive lubrication pumps. This tee coupling acts as the ideal fluid-distribution link for delicate, small-diameter lines routing through complex mechanical chassis.

Core Technical Blueprint & Symmetric Assembly

• The Lubrication Line Advantage: Tailored for the Extra Light (LL) Series parameters, this branching union handles operating boundaries up to 100 bar, matching the standard limits of automated oil and grease lines (engineered for small-diameter tubing ranging from 4mm to 12mm). Its compact profile allows it to fit inside the tightest machinery corridors without adding unnecessary weight.

• Symmetric Metric Design: Engineered as a direct 3-way tube-to-tube joiner, all three ends feature identical 24° internal cones machined to the same metric specifications. This eliminates the need for mixed adapters, allowing maintenance crews to branch or splice tubing runs using one standardized component.

  • Metric Taper Tube Seats: Matches standardized European and global machinery lubrication loops for direct, identical 3-way branch plumbing.

Application & Compliance

• Triple-Bite Sealing Mechanics: Tightening the three DIN 3870 coupling nuts drives all cutting rings inward simultaneously, forcing them to bite firmly into the exterior surface of the copper, steel, or high-pressure nylon lubrication tubes. This continuous, balanced mechanical grip prevents line blowouts and stays completely leak-free under severe vibration, constant machine cycling, and shock loads.

• Traceable Compliance: Manufactured in strict accordance with ISO 8434-1, DIN 3870, and DIN 2353 extra-light guidelines. These identical tee unions offer complete interchangeability with leading global fluid handling brands, making them the industry standard for wind turbine bearings, commercial vehicle chassis lubrication, printing presses, and automated assembly conveyor networks.