Metric Thread Archives - RYCO Hydraulics
Metal Seal Connectors – A better alternative to tapered threads

Machined faces were added to tapered pipe threads in an effort to address some of the shortcomings of pipe threads. A deep 30 degrees chamfer was added to the face of thread to form a seat. This is a modification that is only really seen in hydraulic products due to the high pressures involved. While a tapered pipe thread is still used, the thread no longer provides the sealing function. The thread now only provides the holding function, which is a fundamental change in its use. The machined face provides the following benefits: Easier orientation Better sealing No need for sealant The 30 degree machined face was first developed for the British pipe thread, BSP. That way the advantages of the sealing on the machine seat are available in the America thread also. Metal Seal Pipe Thread Types British Pipe Threads: British Standard Pipe Taper (BSPT) British Standard Pipe Parallel (BSPP) American Pipe Threads: National Pipe Taper (NPT) Advantages of Metal Seal Pipe Threads These connectors have a greatly reduced leakage when compared with simple pipe threads. Disadvantages of Metal ...

Soft Seal Connectors – The ultimate hydraulic connectors

Soft seal connectors are a modern development in hydraulic connectors, intended to address the most common issues with older designs, including leakage and the effects of vibration. They’re also designed to work in much higher pressure systems, to meet the growing needs of a wide range of applications across different industries. Soft Seal Connector Definitions Elastomer noun (Chemistry) An elastic substance occurring naturally, as a natural rubber, or produced synthetically, such as butyl rubber or neoprene. Elastomeric adjective (Chemistry) A part that has an elastic quality about it, or one that uses an elastomer. Soft seal, or elastomeric connectors use a soft seal to complete the joint, resulting in a leak free and vibration resistant joint. The seal is usually an O-ring. Advantages of soft seal connectors Soft seal connectors have a number of advantages, including: They are positive sealing Resistant to vibration Very high pressure capability Easy and quick to assemble, which is important in high-volume production Disadvantages of soft seal connectors The O-ring in soft seal connectors may harden with heat or soften with incompatible system fluids, so ...

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 ...