- General Information
– Product: No-Hub Coupling for DWV System
– Applicable Pipe: Hubless cast iron drainage pipe
– Size Range: DN50 / DN75 / DN100 / DN150 / DN200
– Standards: ASTM C1277, ASTM A888
Recommended Tightening Torque
Bolt Torque
DN50 5–6 N·m
DN75 6–8 N·m
DN100 8–10 N·m
DN150 10–12 N·m
DN200 12–14 N·m
– Tighten crosswise, step by step
– Do not over-tighten to avoid gasket damage
Alignment Tolerance
– Axial gap ：≤ 3 mm
– Radial offset ：≤ 0.3% of pipe diameter
– Angular misalignment ：≤ 1°
– Deflection compensation ：≤ 3°
- Installation Steps
- Clean pipe ends, remove burrs & rust
- Slide rubber sleeve onto one pipe
- Butt pipes and keep concentric
- Position gasket at center of joint
- Install stainless steel clamp
- Tighten bolts crosswise to rated torque
Final Inspection
– Gasket evenly compressed, no extrusion
– No visible gap between clamp and gasket
– Pipes aligned, no obvious deflection
– No leakage in water / pressure test
– No abnormal noise when running
MJ Coupling/No hub coupling/Hubless coupling/Cast iron pipe coupling
Media Contact
Company Name: Tianjin Tiancheng Pipeline Technology Co., Ltd.
Email: Send Email
Country: China
Website: https://www.tjtccoupling.com/