Special Flanges
- High Surface Finish: Surface roughness can reach Ra0.37 or even higher for reliable sealing.
- Tight Dimensional Control: Overall tolerance is held within 0.05 mm to ensure precise fit.
- Controlled Size & Weight: Each flange is less than OD 850 mm or no more than 80 kg per piece.
- Premium Materials: Available in SS304, SS316, SS321, SS318, F55, F60, 904L to handle corrosion and high pressure.
Technical Specifications
| Item | Specification |
| Product Name | Special Flanges |
| Maximum Outside Diameter | < 850 mm |
| Maximum Unit Weight | ≤ 80 kg per flange |
| Surface Roughness | Up to Ra0.37 or higher on sealing surfaces |
| Dimensional Tolerance | Within 0.05 mm |
| Available Materials | SS304, SS316, SS321, SS318, F55, F60, 904L |
| Manufacturing Process | Precision CNC machining and fine finishing |
| Production Basis | Fully according to customer drawings and specifications |
| Sample Policy | Two free samples for quality checking |
Customization Options
- Custom inner/outer diameter, thickness and hub geometry according to drawings.
- Special sealing faces (raised face, ring-type joint, tongue & groove, custom gasket grooves).
- Flexible bolt-hole number, diameter, PCD and tapped/through-hole patterns.
- Defined surface roughness levels on sealing areas to match gasket or process requirements.
- Optional heat treatment, pickling, passivation or protective coatings.
Applications
- Chemical and petrochemical reactors, columns and custom nozzles.
- Oil & gas manifolds, separators and high-pressure piping spools.
- Power generation piping, condensers and heat-exchange interfaces.
- Offshore and marine systems handling seawater or corrosive media.
- Desalination and water-treatment equipment with demanding corrosion resistance.
- Food, beverage and pharmaceutical process lines requiring smooth, cleanable surfaces.
- Any engineered project that requires non-standard, tight-tolerance flanges.
Raw Materials
We produce and purchase raw materials strictly according to customer requirements, ensuring full compliance with project specifications, mechanical properties, and international standards.
Main steel grades we produce:
Steel Grade | Standards | Classification | Products |
1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4871 | EN 10222-5 | L | Forged flanges and Forged parts |
F304, F304L, F316, F316L, F321, F316T, F310, F904L | ASTM A182 | L | Forged flanges and Forged parts |
F51, F53, F55, F60 | ASTM A182 | L | Forged flanges and Forged parts |
LF2 | ASTM A350 | V | Forged flanges and Forged parts |
F11, F22 | ASTM A182 | V | Forged flanges and Forged parts |
A105 | ASTM A105 | N | Forged flanges and Forged parts |
CNC Machining Capabilities
We operate multiple machining lines and CNC centers engineered to deliver tight tolerances, superior surface finishes, and consistent quality for complex forged components.
Equipments and Quantities | ||
Item No. | Equipments | Quantities |
1 | Ramp CNC lathe | 6 |
2 | Normal lathe | 8 |
3 | Machining center | 4 |
4 | CNC lathe | 10 |
Inspection & Quality Control
To ensure the high quality of non-standard flanges, we are equipped with professional testing and inspection systems:
- 3D Measurement Equipment
- Ultrasonic Cleaning Machine
- Physical & Chemical Testing
- Dimensional Inspection
Packaging for Non-Standard Flanges
We provide protective packaging options according to customer needs:
- Anti-rust treatment
- Plastic film wrapping
- Wooden cases
- Wooden pallets
- Custom packaging available
Why Choose Boberry
Complete In-House Manufacturing
Integrated forging, heat treatment, machining, and inspection ensure stable quality, faster lead times, and full control over every production stage.
European-Market Proven Quality
Long-term supply to Germany, Austria, Switzerland, and Nordic countries demonstrates our ability to meet strict technical standards and customer expectations.
Custom Engineering Support
Tailor-made stainless-steel parts based on your drawings, with trial samples available to validate design, performance, and fit before full-scale production.