Character:
Ductile Iron Ring/flange, also named as convoluted flange or bolt ring. it’s designed for HDPE pipe flange adapter
- Flange Material Grade: Cast Ductile iron ASTM A536 grade 65-45-12
- Flange Design Standard: ASME/ANSI B16.5, ASME/ANSI B16.47 Class 150, ASTM B16.1 CL125, AWWA C207 B/D/E.
- Surface Coating: Epoxy Powder Coating, Prime Paint, E-Coating, Galvanization, Hot dipped.
- Working Pressure: SDR7/ 276PIS.
- Brand: CQ
Applications:
- HDPE pipe adaptor
Backup ring 2″ SDR7 Dimensions


2″ SDR11, IPS Backup Flange |
||
| Inch | mm | |
| Outside Diameter (OD) | 6 | 152.4 |
| Thickness (T) | 0.75 | 19.05 |
| Inner Diameter (I.D.) | 2.46 | 62.48 |
| Holes (N) | 4 | 4 |
| Bolt Hold Size (B.D.) | 0.75 | 19.05 |
| Bolt Circle (B.C.) | 4.75 | 120.65 |
| Radius (R) | 0.31 | 7.87 |
| Unit Weight (Lbs/kgs) | 2.4 | 1.1 |
| Pressure Class (PC) | 335 | 335 |
| FM Rate (psi) | FM(200psi) | |
Available Options
- Sizes: 2″–36″ (IPS) and 4″–24″ (DIPS)
- SDR Ratings: SDR 7, SDR 9, SDR 11
- Material: ductiel iron, stainless steel SS316
- Finishes: Epoxy-Coated or Red Oxide Primer
When you purchase our rings, pls take care our brand “CQ”
Ductile Iron Backup Rings Manufacture process














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