- Zhengzhou Huitong Pipeline Equipment Co.,Ltd
- Main products: flange, fasteners, pipe fittings, steel pipe/tube, plate/sheet
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- A105 long WN flange
- A182 F304 WN flange
- 4130 API 3000 flange
- 254SMO Loose flange with plain collar
- ASTM A182 F316 SO flange
- ASTM A182 F53 SO flange
- ASTM A182 F316 SW flange
- Alloy 31 SO RF flange B16.5
- ASTM A182 F51 plate flange DIN2642 standard
- ASTM A182 F51 WN flange DIN2632 standard
- ASTM A182 F53 blind flange
- ASTM A182 F51 RF blind flange ASME B16.5
- ASTM A182 F51 WN flange ASME B16.5
- C70600 SO flange
- C70600 SAE SW-FF flange
- ASTM A182 F51 WN flange DIN2632 standard
- 254SMO S31254 Lap Joint Flange
- ASTM A182 SS310 3" WN RTJ FLANGE
- ASTM A182 SS310 10" SO RF FLANGE
- ASTM A105 WN Flange ASME B16.47 Series A
- ASTM A516 Gr.70 Spectacle Blind
- 2205 WN flange
- ASTM A182 F316L bleed ring
- ASTM A182 F904L WN Flanges
- ASTM B564 alloy600 plate flange
- ASTM A350 LF2 LWN FLANGES
- ASTM A350 LF2 WN FLANGES
- ASTM A105 WN RF FLANGES
- ASTM A105 LWN FLANGES
- ASTM A182 F904L BL FLANGES
