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Oleo Tecnica CETOP Butt-Weld Stubs

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Oleo Tecnica CETOP Butt-Weld Stubs

Oleo Tecnica CETOP Butt-Weld Stubs ensure a safe and reliable connection for industrial hydraulic systems. Available in Series 250 and Series 400 pressure classes, they feature 37° beveled ends for precise butt welding on rigid piping. They can be configured in A105 carbon steel (or equivalent) and AISI 316L stainless steel, both in the version with an O-Ring seat and in the flat version without a seat.

The available product codes are: COD38ST250, COD12ST250, COD34ST250, COD1ST250, COD114ST250, COD112ST250, COD2ST250, COD212ST250, COD3ST250, COD312ST250, COD4ST250, COD4ST250 OR6387, COD38ST400, COD12ST400, COD34ST400, COD1ST400, COD114ST400, COD112ST400, COD2ST400, COD212ST400, COD212ST400 OR6275, COD3ST400, COD3ST400 OR6300, COD312ST400, COD4ST400, COD4ST400 OR6350 (and the corresponding AISI 316L versions with the CODX prefix and versions without O-Ring seat with the STC suffix).

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Description

Construction and Mechanical Features

Oleo Tecnica CETOP Butt-Weld Stubs are key components for creating leak-tight, deformation-resistant flanged joints on medium- and high-pressure hydraulic lines. Precision machining includes preparation of the joint edge with a calibrated 37° bevel, ideal for full-penetration butt welding on metal pipes ranging from 3/8″ up to 4″.

The product range includes two main material options:

  • Forged A105 carbon steel (or equivalent), suitable for standard industrial applications with conventional fluids;
  • AISI 316L austenitic stainless steel, designed to provide maximum chemical compatibility and high corrosion resistance in aggressive environments.

The components can be ordered with a front profile featuring an O-Ring groove or with a flat face without an O-Ring seat, allowing flanged coupling in compliance with CETOP dimensional requirements.

Working Pressures and Strength Classes

The Oleo Tecnica catalogue divides the butt-weld stubs into two standardized pressure series:

  • Series 250: maximum recommended working pressure of 250 Bar, available in nominal sizes from 3/8″ to 4″;
  • Series 400: maximum recommended working pressure of 400 Bar, designed for heavy-duty hydraulic circuits with a size range from 3/8″ to 4″.

The maximum recommended working pressure is based on the technical parameters of the matching clamping flange. The actual maximum working pressure of the entire system is nevertheless determined by the wall thickness and metallurgical quality of the welded pipe steel.

O-Ring Seals

Models with a front groove accommodate specific O-Ring seals for each nominal size. In Series 250, the elastomeric sealing range includes standard O-Ring codes from 3068 up to 4387, as well as a specific 4″ version with the larger OR6387 seal. In Series 400, due to higher hydraulic loads, standard seals from OR 3068 to OR 4337 are used, together with special larger configurations: OR6275 on the 2″1/2 size, OR6300 on the 3″ size and OR6350 on the 4″ version.

Ordering Designation and Variants

The unique Oleo Tecnica coding system allows the required system variants to be configured precisely:

  • COD…ST: A105 carbon steel version or equivalent, with O-Ring seat;
  • COD…STC: A105 carbon steel version or equivalent, without O-Ring seat;
  • CODX…ST: AISI 316L stainless steel version, with O-Ring seat;
  • CODX…STC: AISI 316L stainless steel version, without O-Ring seat.

Technical Summary Table of the Main Characteristics of Oleo Tecnica CETOP Butt-Weld Stubs.

Characteristic Value
Interface Standard CETOP
Welding Type Butt weld (37° bevel)
Available Pressure Series Series 250 (250 Bar) / Series 400 (400 Bar)
Construction Materials A105 steel or equivalent / AISI 316L stainless steel
Front Sealing Configurations With O-Ring seat (…ST) / Without O-Ring seat (…STC)
Nominal Size Range From 3/8″ to 4″
Pressure Limiting Factor Based on the flange; working pressure determined by pipe thickness and material

Product Codes

Series Max Pressure (Bar) Size Type Code (A105 with OR Seat) Dim. A (mm) Dim. B (mm) Dim. C (mm) Dim. D (mm) Dim. E (mm) Dim. F (mm) O-Ring Type Weight (kg)
Series 250 250 3/8″ COD38ST250 18 12,5 24,5 18 30 7,3 3068 0,05
Series 250 250 1/2″ COD12ST250 22 15 30,2 24 30 7,3 4075 0,07
Series 250 250 3/4″ COD34ST250 28 20 38,1 31,5 35 7,3 4100 0,13
Series 250 250 1″ COD1ST250 35 25 44,4 38 40 8,6 4131 0,21
Series 250 250 1″1/4 COD114ST250 43 32 50,8 43 45 8,6 4150 0,27
Series 250 250 1″1/2 COD112ST250 50 38 60,3 50 50 8,6 4187 0,39
Series 250 250 2″ COD2ST250 62 47 71,4 62 60 10,6 4225 0,69
Series 250 250 2″1/2 COD212ST250 76 58 87,2 76 70 10,6 4275 1,16
Series 250 250 3″ COD3ST250 90 70 101,6 90 80 10,6 4337 1,73
Series 250 250 3″1/2 COD312ST250 102 80 119,0 102 90 19,0 4337 2,67
Series 250 250 4″ COD4ST250 114 90 131,0 114 105 22,5 4387 3,75
Series 250 250 4″ COD4ST250 OR6387 114 90 131,0 114 105 22,5 6387 3,75
Series 400 400 3/8″ COD38ST400 18 11 26,0 18 35 8,4 3068 0,07
Series 400 400 1/2″ COD12ST400 22 14 31,8 24 40 8,4 4075 0,11
Series 400 400 3/4″ COD34ST400 28 18 39,5 32 45 9,4 4100 0,20
Series 400 400 1″ COD1ST400 35 22 47,6 38 50 10,1 4131 0,32
Series 400 400 1″1/4 COD114ST400 44 29 54,0 44 55 10,9 4150 0,44
Series 400 400 1″1/2 COD112ST400 51 35 63,5 51 60 13,2 4187 0,63
Series 400 400 2″ COD2ST400 61 43 79,4 67 70 13,7 4225 1,21
Series 400 400 2″1/2 COD212ST400 80 53 94,2 80 80 17,6 4275 2,04
Series 400 400 2″1/2 COD212ST400 OR6275 80 53 94,2 80 80 17,6 6275 2,04
Series 400 400 3″ COD3ST400 90 58 104,0 90 90 17,6 4275 2,93
Series 400 400 3″ COD3ST400 OR6300 90 58 104,0 90 90 17,6 6300 2,93
Series 400 400 3″1/2 COD312ST400 102 63 119,0 102 90 19,0 4275 4,00
Series 400 400 4″ COD4ST400 114 74 131,0 114 105 22,5 4337 5,45
Series 400 400 4″ COD4ST400 OR6350 114 74 131,0 114 105 22,5 6350 5,45

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