No-Hub Coupling Installation Quick Reference

1. 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

2. 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

3. Alignment Tolerance

- Axial gap ：≤ 3 mm

- Radial offset ：≤ 0.3% of pipe diameter

- Angular misalignment ：≤ 1°

- Deflection compensation ：≤ 3°

4. Installation Steps
5. Clean pipe ends, remove burrs & rust
6. Slide rubber sleeve onto one pipe
7. Butt pipes and keep concentric
8. Position gasket at center of joint
9. Install stainless steel clamp
10. Tighten bolts crosswise to rated torque

5. 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