CNC Turning for Custom Stainless Steel Blind Flanges
Stainless steel blind flanges (also called flange covers or blind flange plates) are critical pressure boundary components used to seal the end of piping systems, pressure vessels and equipment ports. Unlike off-the-shelf stamped flanges, custom-sized blind flanges must match exact bolt circle patterns, face flatness specifications and pressure ratings to ensure leak-tight performance in corrosive operating environments.
At FRIMA, we specialize in CNC turning for custom stainless steel blind flanges, delivering dimensionally accurate, burr-free flange covers machined from solid bar or forged billet stock. As an experienced OEM CNC turning service for metal flange covers, we produce made-to-order blind flanges in a full range of sizes, pressure classes and stainless steel grades, serving fluid systems, chemical processing, food equipment and industrial machinery sectors. Every flange is machined to your exact drawing specifications, with controlled surface finish and full material traceability to meet industry pressure vessel standards.
Core Advantages of Our CNC Turning for Custom Stainless Steel Blind Flanges
1. Uniform Sealing Face Flatness
2. Precise Bolt Circle Positioning
3. Solid Stress-Free Material Structure
4. Fully Customizable Geometry
5. High Durability
6. Compact Design & Multiple Designs
7. Easy-to-Clean, Highly Compatible
8. Global Compatibility
Premium Cemented Carbide CNC Turning Parts
Available Stainless Steel Grades
|
Grade |
Key Material Properties |
Typical Application Scenarios |
|
304 / 1.4301 |
Balanced general corrosion resistance, excellent machinability and weldability. The industry standard for most indoor and mild industrial environments. |
General industrial piping, food equipment, water treatment systems, architectural applications |
|
316L / 1.4404 |
Superior corrosion resistance, especially against chlorides and saline environments. Better high-temperature performance than 304. |
Chemical processing, marine equipment, offshore systems, wastewater treatment, food & beverage processing |
|
303 |
Free-machining grade with improved machinability for high-volume production. Suitable for non-pressure-critical flange covers. |
High-volume general purpose flanges, equipment covers, non-sealing structural flanges |
|
17-4PH |
High strength precipitation hardening stainless steel for high-pressure and high-load applications. |
High pressure vessel flanges, heavy industrial equipment, hydraulic system flanges |
Dimensional Specifications & Tolerance Standards
|
Parameter |
Standard Production Capability |
Precision Grade (upon request) |
|
Flange Outside Diameter |
Ø20mm – Ø300mm |
Ø10mm – Ø400mm |
|
Flange Thickness Range |
3mm – 50mm |
2mm – 80mm |
|
Bolt Circle Diameter Tolerance |
±0.1mm |
±0.05mm |
|
Sealing Face Flatness |
0.05mm per 100mm diameter |
0.02mm per 100mm diameter |
|
Surface Roughness (Sealing Face) |
Ra 1.6 – 3.2μm |
Ra 0.4 – 0.8μm |
|
Bolt Hole Position Tolerance |
±0.1mm positional |
±0.05mm positional |
|
Concentricity (Bore to OD) |
0.05mm TIR |
0.02mm TIR |
Multiple Designs & Finishes for Industrial Applications
Industries & Application Scenarios
Quality Control & CNC Manufacturing Capability