Square Pipe Flange
Product Overview
A Square Pipe Flange is a four-bolt mechanical connector for joining piping sections or components, used in hydraulic fluid systems to form a static sealing interface under pressure.
Technical Specifications
|
Category |
Parameter |
Typical Specification |
|
Basic Specification |
Nominal Size (DN / Inch) |
DN25 / 1" |
|
Pressure Rating |
Nominal Pressure |
210 bar (21 MPa) |
|
Temperature Range |
Operating Temperature |
-20°C to +100°C (NBR) / -20°C to +200°C (FKM) |
|
Mounting Structure |
Bolt Hole Pitch (H × V) |
54.0 mm × 54.0 mm |
|
Mounting Structure |
Bolt Hole Diameter |
13.0 mm |
|
Fasteners |
Recommended Bolt |
M12 × 45 (Grade 8.8 / 10.9) |
|
Flange Body |
Flange Thickness |
22.0 mm |
|
Connection Structure |
Socket Bore Diameter (Pipe OD Fit) |
34.5 mm |
|
Connection Structure |
Socket Depth |
10.0 mm |
|
Sealing Structure |
O-ring Groove Outer Diameter |
42.5 mm |
|
Sealing Structure |
O-ring Groove Depth |
2.8 mm |
|
Sealing Structure |
O-ring Groove Width |
4.1 mm |
|
Material |
Body Material |
Carbon Steel (SF440A / 20#) or Stainless Steel (316L) |
|
Sealing |
Seal Material |
NBR (Nitrile Rubber) or FKM (Viton) |
|
Surface Treatment |
Anti-Corrosion Finish |
Phosphated (black) / Zinc-plated |
Material Veracity & Certificates
Raw Material Traceability
Forging-grade carbon steel and stainless steel billets are sourced from certified steel mills with batch traceability records.
EN 10204 3.1 MTR
Each shipment includes EN 10204 3.1 inspection reports with ladle analysis and tensile test records.
System Certification
Our forging plant maintains audited TUV ISO 9001 and PED 2014/68/EU certification.
Custom Manufacturing & OEM
Custom Dimensions
In-house CNC machining adjusts bolt center pitch and thickness for non-standard connection requirements.
OEM Branding
Laser marking is used to apply part numbers and customer logos on external surfaces when required.
Tailored Surface Finishes
Electroplating and zinc-nickel coatings are applied based on specified atmospheric corrosion ratings.
Quality Control & Testing
Dimensional Verification: CMM inspections maintain critical bolt pitch and groove dimensions within specified submillimeter tolerances.
Sealing Surface Integrity: Roughness testing controls O-ring contact surfaces at Ra 1.6 μm to reduce risk of microleakage under pressure.
Hardness Profile Testing: Brinell tests confirm heat-treated forgings meet structural requirements, reducing field deformation risks.
Nondestructive Crack Detection: 100 percent magnetic particle testing flags surface discontinuities to prevent premature fatigue failure.
Hydrostatic Pressure Verification: Proof pressure testing at 1.5 times nominal rating is performed to verify structural integrity before delivery.
Industrial Applications
|
Application Field |
Typical Use |
Key Benefits |
|
Hydraulic Power Units |
Connecting high-pressure pumps to manifold blocks |
Reduces vibration-related leakage risk; supports stable system pressure |
|
Marine Equipment |
Joining ballast systems and hydraulic steering pipelines |
Corrosion-resistant sealing under high-vibration marine conditions |
|
Industrial Press Machinery |
Connecting heavy hydraulic cylinders to fluid lines |
High strength supports continuous pressure cycling |
|
Construction Vehicles |
Connecting main control valves to hydraulic pump systems |
Compact design fits tight installation spaces |
|
Metallurgical Equipment |
Fastening high-pressure water and oil pipelines |
Stable performance under high temperature and harsh duty cycles |
Supply & Logistics
Export-Grade Packaging
Machined surfaces receive rust-preventative oil before containment in plastic-lined seaworthy wooden crates.
Inventory Buffer Management
Warehouses maintain stock of semi-finished forged bodies to compress production lead times.
Consolidated Air Freight
Urgent small-batch shipments utilize vacuum-sealed heavy-duty cartons with integrated edge protectors.
FAQ
Q: Can these flanges be integrated directly into systems using split flange configurations?
A: No, the bolt patterns differ; Square Pipe Flange installations require matching four-bolt square port connections.
Q: Do you provide matching high-tensile fasteners and seals along with the flange bodies?
A: Kits can be supplied complete with appropriate grade bolts, washers, and compatible elastomer O-rings upon request.
Q: What options are available if the piping requires frequent disassembly for maintenance?
A: Split-type or companion configurations are available to simplify pipeline breakdown without removing welded sections.
Q: How do you protect the critical sealing groove from damage during international transit?
A: Every flange face is fitted with a snap-on plastic cap to prevent scratches on the machined surfaces.
Q: Can we request a specific surface finish if the standard phosphating does not match our pipeline?
A: Alternative surface options, including zinc-nickel plating or specialized oil finishes, can be provided during machining.
Q: How do you ensure the flat companion flange face aligns flush with the O-ring face?
A: Paired mating surfaces are machined in controlled runs to maintain alignment during pressure clamping.
Q: Do you accept third-party inspectors like SGS to witness the pressure testing at your plant?
A: Third-party inspectors are welcome to access our testing bay with prior scheduling before final packaging.
Q: What happens if our piping wall thickness does not match your standard socket weld depth?
A: Socket countersinks can be modified during the CNC stage to match your specific tube wall schedule.
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