Hydraulic Connectors Archives - RYCO Hydraulics
Hydraulic connector thread forms and their applications

If you’re new to the world of hydraulics, it can seem difficult to gain an understanding of the many hydraulic connectors available today. In this series of articles, you’ll learn about the different types of hydraulic connectors and their key differences, which will assist in making some sense of this complex subject. Factors affecting development of hydraulic connectors Two factors have influenced the development of hydraulic connectors: 1: A reluctance to adopt industrial standards between countries Many of these connector types were developed during the 20th century; a time of fierce industrial competition. Co-operation between the major industrialised countries was limited for many years due to conflict. 2: The evolution of hydraulic systems Hydraulic systems have changed a great deal in a short period of time. Driving this change is the gradual increase of the desired machine output force, which is seen as a pressure increase. In the previous series of articles introducing the three types of hydraulic connectors we discussed three principle types of connectors: Tapered threads Metal seal connectors Soft seal connectors Each major industrial region has developed ...

Tapered pipe thread hydraulic connectors – BSPT and NPTF

Tapered pipe thread hydraulic connectors have an outside diameter that is cut on a cone. This results in sides that are not parallel. Two common types of tapered thread connectors are BSPT and NPTF. BSPT British Standard Pipe Taper Country of origin: Britain Thread angle: 55 degrees (Whitworth) Seat angle: 30 degrees BSPT is a tapered thread. This means that the outside diameter of the thread is cut on a cone. The sides are not parallel. The taper angle is a rise of 3/4" for every 12" in length. This is approximately 1 degree, 47 minutes. Male BSPT threads mate with female BSPT threads in adaptors. BSPT female threads are also used in port applications. As BSPT ports seal directly on the thread, the only machining required is drilling the hole and tapping the thread. BSPT threads can also be used as a machined seat connector. The thread used in the female swivel is parallel, BSPP. This is so that the connector bottoms out onto the sealing face. The female swivel is made as a two part assembly. The majority ...

Metal seal hydraulic connectors and their uses

Metal seal connectors use profiled metal surfaces on the connector to form a seal. There are many different types of metal seal connectors, including JIC, DIN, BSPP and JIS, NPSM, and they are used across many industries. JIC Joint Industries Council Country of origin: USA Thread angle: 60 degrees (UNC / I-INF) Seat angle: 37 degrees JIC threads are parallel. The thread used is a unified thread, either course; I-INC, or fine; UNF. JIC are the most popular hydraulic connector form due to their versatility. They can connect to both hose and tube. When connecting to inch tube, it needs to be flared and a tube nut and sleeve, (RYCO part number S6), are required. Metric - DIN 2353 Deutsche Industrie Normen Country of origin: Germany Thread angle: 60 degrees (DIN 3853) Seat angle: 24 degrees They have a 24 degrees internal machined seat. These threads are becoming much more common worldwide. Like the JIC connector, there are DIN threads that can connect to both hose and tube. Unlike all other thread types, there are three sub-groups within the DIN ...

Soft seal hydraulic connectors and their applications

Soft seal connectors use an elastomeric object to create a leak-free seal, they can take the form of bonded washers, encapsulated seals and o-rings. There is a wide range of soft seal connector types, including BSPP, DIN, ORFS and SAE. BSPP British Standard Pipe Parallel Country of origin: Britain Thread angle: 55 degrees (Whitworth) BSPP threads are also an elastomeric connector. A soft seal is used to ensure a leak free joint. RYCO use an O-ring and metal back-up ring or an encapsulated seal to complete the joint. In port applications, the seal is made by an elastomeric seal at the base of the thread, and not on the machined seat. BSPP port threads are very commonly used in Australia, but are becoming less preferred. BSPP threads can also be sealed by other methods such as an encapsulated seal or a bonded washer. When a bonded washer is used, the shoulder of the thread must be machined to a cone to keep the washer away from the edge of the thread. The photo below shows an encapsulated seal. This sealing ...