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Oleo Tecnica Butt-Weld Counter Flanges for Metric Pipe with Cylindrical Bore
Oleo Tecnica Butt-Weld Counter Flanges for Metric Pipe with Cylindrical Bore ensure reliable hydraulic connections for very high-pressure applications. Designed to withstand pressures up to 414 Kg/cm², these weld-on flanges are available in Series 3000 and 6000. Manufactured in S355 or AISI 316L stainless steel, they offer metric or UNC fastening-hole options, making them suitable for a wide range of hydraulic systems.
The available product codes are: GFS100SRE25, GFS102SRE30, GFS104SRE38, GFS106SRE42, GFS106SRE48, GFS108STRE48, GFS108SRE60, GFS110SRE76, GFS112STRE76, GFS112SRE76, GFS114STRE76, GFS114STRE88, GFS116STRE76, GFS116STRE88, GFS401SRE20, GFS402SRE20, GFS402SRE25, GFS403SRE25, GFS403SRE30, GFS404SRE38, GFS404SRE38826, GFS405SRE38, GFS405SRE48, GFS406SRE60, GFS507SRE76 (also available in the corresponding GFX family variants for stainless steel and in SREU/STREU family versions for UNC holes).
Oleo Tecnica Butt-Weld Counter Flanges for Metric Pipe with Cylindrical Bore
Oleo Tecnica Butt-Weld Counter Flanges for Metric Pipe with Cylindrical Bore are designed to ensure stable and secure connections within hydraulic systems operating under high pressure. The mechanical design of these flanges focuses on optimising fastening and sealing performance, allowing seamless integration into heavily stressed industrial piping networks.
The operating principle is based on butt welding combined with a cylindrical bore designed to accommodate metric pipe sections, creating a unified assembly with very high mechanical strength. The fastening holes integrated into the counter flange allow precise tightening, distributing loads evenly and preventing fluid leakage within the system. It is essential to emphasise a key technical principle: while the maximum recommended working pressure stated in the tables is based exclusively on the structural capacity of the flange itself, the maximum working pressure of the complete system will ultimately depend on the wall thickness and material type (steel quality) of the pipe used in conjunction with it.
The range is divided into two primary variants to meet different volumetric and pressure load requirements: Series 3000 and Series 6000.
Series 3000 covers sizes from 3/4″ up to 4″. The maximum recommended working pressures for this series vary according to size: 345 Kg/cm² for 3/4″ and 1″ sizes, decreasing to 276 Kg/cm² for the 1″1/4 size, 207 Kg/cm² for 1″1/2 and 2″, 172 Kg/cm² for the 2″1/2 size, 138 Kg/cm² for 3″, and finally 34 Kg/cm² for the larger 3″1/2 and 4″ versions. Weights in this series range from a minimum of 0.39 Kg up to a maximum of 2.85 Kg.
Series 6000 is engineered for even more demanding hydraulic applications. Sizes range from 1/2″ up to 2″1/2. Supported pressures remain at 345 Kg/cm² for the smaller sizes (1/2″, 3/4″, 1″), decrease to 276 Kg/cm² for the 1″1/4 models and specific 1″1/2 variants, and then reach a maximum peak of 414 Kg/cm² for the enhanced 1″1/2 model (GFS405SRE48), the 2″ sizes and the 2″1/2 size. Weight in this series ranges from 0.25 Kg for the base model up to 6.50 Kg for the 2″1/2 unit.
The counter flanges are manufactured in two highly reliable industrial materials. The first standard option is S355 steel, ideal for heavy mechanical and hydraulic applications. The second option is AISI 316L stainless steel, required for highly corrosive environments or sectors subject to stringent corrosion-resistance standards.
Installation flexibility is ensured by the availability of two fastening-hole standards: metric threading and UNC threading. For metric threads, bolt sizes range from M8 to M24, while UNC threads range from 5/16″ to 1/8″.
The ordering designation follows a precise coding system according to material and hole configuration:
| Feature | Value |
|---|---|
| Product Family | Butt-weld counter flanges, metric pipe, cylindrical bore |
| Available Series | Series 3000 / Series 6000 |
| Materials | S355 / AISI 316L |
| Fastening Holes | Metric (M8 – M24) / UNC (5/16″ – 1/8″) |
| Series 3000 Sizes | From 3/4″ to 4″ |
| Series 6000 Sizes | From 1/2″ to 2″1/2 |
| Max. Pressure (Series 3000) | From 34 Kg/cm² to 345 Kg/cm² |
| Max. Pressure (Series 6000) | From 276 Kg/cm² to 414 Kg/cm² |
| Model / Code | Series | Size | Max. Pressure (Kg/cm²) | Thread (M / UNC) | Weight (Kg) |
|---|---|---|---|---|---|
| GFS100SRE25 | 3000 | 3/4″ | 345 | M10 / 3/8″ | 0.39 |
| GFS102SRE30 | 3000 | 1″ | 345 | M10 / 3/8″ | 0.45 |
| GFS104SRE38 | 3000 | 1″1/4 | 276 | M10 / 7/16″ | 0.69 |
| GFS106SRE42 | 3000 | 1″1/2 | 207 | M12 / 1/2″ | 1.05 |
| GFS106SRE48 | 3000 | 1″1/2 | 207 | M12 / 1/2″ | 1.05 |
| GFS108STRE48 | 3000 | 2″ | 207 | M12 / 1/2″ | 1.22 |
| GFS108SRE60 | 3000 | 2″ | 207 | M12 / 1/2″ | 1.22 |
| GFS110SRE76 | 3000 | 2″1/2 | 172 | M12 / 1/2″ | 1.63 |
| GFS112STRE76 | 3000 | 3″ | 138 | M16 / 5/8″ | 2.33 |
| GFS112SRE76 | 3000 | 3″ | 138 | M16 / 5/8″ | 2.33 |
| GFS114STRE76 | 3000 | 3″1/2 | 34 | M16 / 5/8″ | 2.49 |
| GFS114STRE88 | 3000 | 3″1/2 | 34 | M16 / 5/8″ | 2.49 |
| GFS116STRE76 | 3000 | 4″ | 34 | M16 / 5/8″ | 2.85 |
| GFS116STRE88 | 3000 | 4″ | 34 | M16 / 5/8″ | 2.85 |
| GFS401SRE20 | 6000 | 1/2″ | 345 | M8 / 5/16″ | 0.25 |
| GFS402SRE20 | 6000 | 3/4″ | 345 | M10 / 3/8″ | 0.52 |
| GFS402SRE25 | 6000 | 3/4″ | 345 | M10 / 3/8″ | 0.52 |
| GFS403SRE25 | 6000 | 1″ | 345 | M12 / 7/16″ | 0.70 |
| GFS403SRE30 | 6000 | 1″ | 345 | M12 / 7/16″ | 0.70 |
| GFS404SRE38 | 6000 | 1″1/4 | 276 | M14 / 1/2″ | 1.08 |
| GFS404SRE38826 | 6000 | 1″1/4 | 276 | M14 / 1/2″ | 1.08 |
| GFS405SRE38 | 6000 | 1″1/2 | 276 | M16 / 5/8″ | 1.76 |
| GFS405SRE48 | 6000 | 1″1/2 | 414 | M16 / 5/8″ | 1.76 |
| GFS406SRE60 | 6000 | 2″ | 414 | M20 / 3/4″ | 2.98 |
| GFS507SRE76 | 6000 | 2″1/2 | 414 | M24 / 1/8″ | 6.50 |