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BSP Threads
BSP (British Standard Pipe) threads are one of the most commonly used thread types for fluid and gas transfer applications. These threads come in two forms — parallel (BSPP) and tapered (BSPT) — and are used across Europe, Asia, and globally in hydraulic systems, fittings, and connectors. They are known for their reliable sealing using an O-ring or metal-to-metal contact.
| Thread | Threads Per Inch | D (mm) | d (mm) |
|---|---|---|---|
| 1/8 | 28 | 9.73 | 8.6 |
| 1/4 | 19 | 13.16 | 11.5 |
| 3/8 | 19 | 16.66 | 14.9 |
| 1/2 | 14 | 20.96 | 18.6 |
| 5/8 | 14 | 22.91 | 20.6 |
| 3/4 | 14 | 26.44 | 24.1 |
| 1 | 11 | 33.25 | 30.3 |
| 1-1/4 | 11 | 41.91 | 38.9 |
| 1-1/2 | 11 | 47.80 | 44.9 |
| 1-3/4 | 11 | 53.75 | 50.8 |
| 2 | 11 | 59.62 | 56.7 |
| 2-1/4 | 11 | 65.72 | 62.8 |
Specifications
- • Thread types: BSPP (parallel), BSPT (tapered)
- • Threads per inch: ranges from 11 to 28
- • Diameter range: 9.73 mm to 65.72 mm
- • Conforms to ISO 228 and ISO 7 standards
- • Available in Brass, Stainless Steel, and Carbon Steel
Features
- • Widely used in Europe, Asia, and globally
- • Compatible with soft-sealing and metal-sealing designs
- • Excellent sealing even without PTFE when used with bonded washers (BSPP)
- • High mechanical strength and pressure capability
Applications
- • Hydraulic Equipment: Pipe and hose connections
- • Oil & Gas: Refineries, drilling rigs, and pipelines
- • Water Treatment: Fluid transport pipelines and valves
- • Automotive Systems: Lubrication and cooling lines
- • Industrial Machinery: Pneumatic and fluid transmission