ORFS FITTINGS (K41) CATERPILLAR

Straight fittings for hose crimping with ORFS thread 

Straight fittings with nut (flat) UNF thread (ORFS) also designated as DKORFS or colloquially called CATERPILLAR fittings. We offer ORFS type fittings in straight as well as 45 or 90-degree elbow variants. Our range includes fittings and components with internal and external threads with a caterpillar-type flat seal option. 

Hose fittings with flat face seal

A characteristic feature of this type of fittings is the flat seal called a face seal; the fitting does not have any cone. ORFS fittings connect with AORFS fittings which are fittings with an external thread (a fitting with a flat seal and a special o-ring inside the flat surface). It is the o-ring that ensures the reliability of the connection. ORFS are mainly found in construction machinery - this type of fitting was created for very high pressures - it guarantees connection reliability and withstands the highest possible working pressures. In Poland, this group of fittings often appears under the K41 designation or is called American flat fittings. We offer all types of ORFS fittings in many sizes. The ORFS components we offer are made of high-quality steel and are galvanized. See also: connectors with ORFS threads

High-pressure hose fittings 

ORFS flat fittings K41 are fittings designed for high-pressure systems. Thanks to the flat seal with an O-ring, they guarantee exceptional tightness and vibration resistance, making them an ideal solution for industrial machinery, heavy equipment, and specialized vehicles. Made of durable, corrosion-resistant materials, they perform perfectly in difficult working conditions. A wide selection of sizes and thread types allows for easy matching to various applications. 

ORFS thread sizes 

Threads in ORFS (O-Ring Face Seal) fittings are available in standard inch sizes, which makes them easy to match to various hydraulic systems. The most common ORFS thread sizes are: 9/16'' ORFS, 11/16'' ORFS, 13/16'' ORFS, 1/2'' ORFS, 1" ORFS, 1.3/16'' ORFS, 1.7/16'' ORFS, 1.11/16'' ORFS, 2" ORFS. Also check: gauges for ORFS threads