Rigid Connections for High-Flow Systems

SAE 4 Bolt Flange products provide rigid connections between equipment and piping systems using flange plates. These flanges are designed for high-pressure and high-flow hydraulic systems. Our products cover flange outer diameters from Φ20mm to Φ110mm, with thread sizes ranging from M6 to M60. These flanges provide secure and leak-free connections for demanding hydraulic applications, including industrial machinery and fluid control systems.

Precision Flange Flatness for Reliable Sealing

Flange flatness is the primary factor affecting sealing performance. Uneven flange surfaces can prevent uniform gasket compression and increase leakage risks. We control flange flatness within ≤0.005mm. For larger specifications, we guarantee flatness accuracy of 0.08mm per meter. Accurate flatness ensures uniform force distribution after installation. This helps prevent high-pressure oil leakage through flange mating surfaces and improves long-term system reliability.

Turn-Mill Compound Machining Process

Our flange manufacturing process uses turn-mill compound machining technology. Hehai/DeMA 3+2 five-axis simultaneous machining centers complete precision milling operations on flange surfaces. High-precision CNC lathes perform thread machining and seal groove processing. We strictly follow IATF16949 quality management system standards. During production, we conduct first article inspections and regular in-process inspections with timely instrument calibration. Our engineering team has extensive experience in hydraulic components and provides customized solutions for different SAE 4 Bolt Flange requirements.

Complete Inspection Documentation Included

We provide complete inspection reports with every shipment. These reports include actual measurement data for flange flatness, thread accuracy, and critical dimensions. Our calibrated precision instruments ensure reliable inspection results throughout production. Customers can also arrange third-party agencies for on-site inspection. SAE 4 Bolt Flange products support EXW, FOB, and DDP trade terms, providing convenient procurement options for global customers.

Technical Specifications

Parameter	Minimum Specification	Maximum Specification
Flange Outer Diameter (Φ)	20 mm	110 mm
Thread Specification	M6	M60
Flange Flatness	≤0.005 mm	0.08 mm/m