Product Overview
SAE Hydraulic Pipe Flanges are bolted pipe connection components used to connect rigid hydraulic piping with pumps, valves, manifolds, cylinders, and hydraulic equipment in medium- and high-flow hydraulic systems.
Flange Connection Benefits
Large Flow Passage
The flange structure provides a larger internal flow path than many threaded pipe connections of equivalent size, helping reduce flow restriction in hydraulic piping systems.
Stable Bolt-Clamped Sealing
The sealing load is generated through bolt clamping and O-ring compression rather than thread interference, supporting sealing consistency under vibration and pressure fluctuation.
High Pressure System Compatibility
Available in SAE Code 61 and Code 62 configurations for hydraulic systems operating up to 420 bar (6,000 PSI) depending on flange size and series.
Standardized Installation Dimensions
Manufactured according to SAE J518 / ISO 6162 dimensions to support interchangeability with compatible hydraulic equipment.
Flange Manufacturing Process
Hot Forged Flange Bodies
Flanges are produced from forged steel blanks with forging reduction ratios typically controlled above 3:1 to improve material continuity.
Bolt Hole Position Control
Bolt hole locations are CNC machined with positional tolerance controlled within ±0.10 mm to support assembly alignment.
Sealing Face Finishing
Critical sealing surfaces are machined to Ra ≤ 3.2 μm to support stable O-ring compression.
Flatness Inspection
Flange sealing face flatness is controlled within 0.10 mm to reduce uneven sealing load distribution.
Surface Protection Verification
Zinc-nickel plated versions are verified to achieve 720+ hours neutral salt spray resistance (ASTM B117).
Available Configurations
| Item | Available Options |
| Standard | SAE J518, ISO 6162 |
| Flange Series | Code 61, Code 62 |
| Connection Type | Split Flange, One-Piece Flange |
| Material | Carbon Steel, Stainless Steel 304, Stainless Steel 316 |
| Pipe Size | 1/2"–5" |
| Seal Type | O-Ring Seal |
| Surface Finish | Zinc Plated, Zinc-Nickel Plated |
| Marking | Part Number, Batch Code, Customer Logo |
Typical Installation Scenarios
Used for rigid hydraulic line installation in medium- and large-diameter fluid circuits.
Applied in excavators, loaders, cranes, and heavy-duty hydraulic equipment.
Used in hydraulic power units, presses, and centralized hydraulic systems.
Suitable for hydraulic installations operating under pressure pulsation and continuous duty conditions.
FAQ
Q: What is the difference between Code 61 and Code 62?
A: Code 62 is designed for higher-pressure applications, while Code 61 is commonly used in standard hydraulic service.
Q: Why use pipe flanges instead of threaded fittings?
A: Flanges are commonly selected for larger sizes, higher flow demand, and easier maintenance access.
Q: Can SAE flanges be reused?
A: Reuse depends on sealing surface condition, bolt condition, and O-ring replacement practice.
Q: Do flange systems require thread sealant?
A: No. Sealing is achieved through O-ring compression rather than thread sealing.
Q: What information should be provided for quotation?
A: Flange series, pipe size, pressure requirement, material grade, seal material, and application environment should be confirmed before ordering.
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