Oleo Tecnica Metric Threaded Flanges with DIN 3901-3902 Connection

Description

General Specifications and Construction Principles

Oleo Tecnica Metric Threaded Flanges with DIN 3901-3902 Connection represent a reference standard for rigid connections in industrial hydraulic systems. Designed for precision coupling, these flanges cover a dimensional range from 1/2″ to 1″1/2. The metric threaded connection, with sizes ranging from M22x1,5 for the most compact models up to M52x2 for larger diameters, ensures stable mechanical fastening while minimising the risk of fluid leakage even in the presence of vibrations or pressure peaks. The geometric design optimises load distribution across the anchoring points, with fastening-hole centre distances (dimension C) calculated to maximise the structural strength of the component.

Hydraulic Performance: Series 3000

Series 3000 is engineered for medium- and high-pressure applications, with resistance specifications that vary according to the nominal flange size. For 1/2″, 3/4″ and 1″ diameters, the maximum recommended working pressure reaches 345 Kg/cm². As the diameter increases, the rated parameters adapt to hydraulic tolerances: the 1″1/4 size supports up to 276 Kg/cm², while the 1″1/2 model is rated for a maximum pressure of 207 Kg/cm². Component weight in this series varies proportionally from 0.25 Kg (model AFS080E) to 1.02 Kg (model AFS106E), providing an excellent balance between mass and hydraulic sealing performance.

Hydraulic Performance: Series 6000

For circuits subjected to extreme mechanical and hydraulic stress, Series 6000 provides higher and constant performance. Regardless of nominal size (from 1/2″ up to 1″1/2), all flanges in this family guarantee a maximum recommended working pressure of 414 Kg/cm². External dimensions (dimensions D and F) and thicknesses are increased compared with the equivalent Series 3000 versions to withstand the radial and axial loads generated by very high pressures. One notable model in this series is the 1″1/4 AFS404EL13 variant, which differs from the standard AFS404E model in a specific dimensional variation of dimension S (13.5 mm compared with 15 mm) and in the associated UNC screw set. Series 6000 weights range from 0.33 Kg to 2.23 Kg.

Materials and Supply Designations

Oleo Tecnica Metric Threaded Flanges with DIN 3901-3902 Connection are manufactured in two metallurgical variants to meet different environmental and operating requirements: S355 carbon steel (identified by the AFS prefix) and AISI316L stainless steel (AFX prefix, ideal for corrosive environments).
The coding system allows precise configuration at the ordering stage:

• The suffix “E” (e.g. AFS…E / AFX…E) indicates the flange only.
• The suffix “EM” (e.g. AFS…EM / AFX…EM) identifies the flange complete with metric screws, spring washers and O-Ring.
• The suffix “EU” (e.g. AFS…EU / AFX…EU) indicates the kit with UNC screws, spring washers and O-Ring.

Technical note: UNC screw sets are available exclusively in carbon steel, regardless of the material selected for the flange body. The supplied O-Ring seals follow standard numbering (from 4075 to 4187), selected for exact front-seat compatibility.

Summary technical table of the main characteristics of Oleo Tecnica Metric Threaded Flanges with DIN 3901-3902 Connection

Product Codes