5/8 BSP thread, characteristics and application
5/8 BSP thread, or British Standard Pipe, is a popular type of pipe thread used in power hydraulics, pneumatics, and various industrial installations. The 5/8 BSP designation refers to a nominal pipe diameter of approximately 22.9 mm and a pitch of 14 threads per inch (14 TPI). These threads are used in applications where tightness, reliability, and connection durability are essential.
What distinguishes the 5/8 BSP thread
The 5/8 BSP thread has a profile angle of 55 degrees and comes in two basic types:
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BSPP (G) – parallel thread, in which tightness is achieved using seals, washers, or O-rings,
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BSPT (R) – tapered thread, in which tightness is created by the pressure of the tapered thread surfaces.
Thanks to their design, BSP threads guarantee high mechanical strength and excellent tightness. Connections of this type can be repeatedly assembled and disassembled without losing their sealing properties.
5/8 inch thread how many mm
The question “5/8 inch thread how many mm” appears very often when selecting hydraulic components and threaded fittings. In calculation, 5/8 inch corresponds to 15.875 mm (1 inch = 25.4 mm). However, it should be remembered that in the case of pipe threads, the 5/8" designation does not always mean the direct outer diameter measured with a caliper. In threads such as BSP or NPT, the nominal size refers to the historical pipe diameter, and the actual outer diameter of the thread may be different than 15.875 mm. Therefore, when selecting threaded components, it is crucial to determine the thread type (BSP, NPT, UNF, etc.), pitch, and actual diameter, rather than just converting the value from inches to millimeters.
Application of the 5/8 BSP thread
5/8 BSP threads are widely used in hydraulic, pneumatic, and liquid and gas transport systems. They are primarily used in:
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hose fittings and ends,
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adapters and reducers,
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threaded tees and elbows,
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water and air installations,
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oil and lubrication systems.
Thanks to its versatility, the 5/8 BSP thread is used in industry, workshops, construction machinery, and mobile equipment.
Equivalents and compatibility
The thread 5/8 BSP is dimensionally similar to the metric thread M22x1.5, however, they are not interchangeable. They differ in profile angle, pitch, and manufacturing standard. Therefore, during assembly, components made according to the same BSP standard should be used to avoid leakage and damage to the connection.
Technical parameters of the 5/8 BSP thread
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Thread type: BSP (British Standard Pipe)
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Type: BSPP (G) – parallel / BSPT (R) – tapered
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Outer diameter: approx. 22.9 mm
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Pitch: 14 threads per inch (TPI)
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Profile angle: 55°
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Standard: BS 21 / ISO 228
Why choose 5/8 BSP thread components at the Hydron store
High-quality connectors, fittings, and adapters with 5/8 BSP threads, made of durable materials resistant to high pressure and corrosion, are available at the Hydron store. These products work well in both industrial and workshop installations. The Hydron team assists in selecting the appropriate components, offering professional technical advice and full support at every stage of the order.
Order today at the Hydron store and choose proven solutions in the field of power hydraulics.
