BSP Pipe Thread Fittings are pipe & pneumatic fittings manufactured to ISO 228 (G). This page lists the full dimensional range with the key specifications engineers need to select and specify them.
What Are BSP Pipe Thread Fittings?
BSP Pipe Thread Fittings are pipe & pneumatic fittings defined by ISO 228 (G). They are selected by thread size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.
Dimensions & Specifications (ISO 228 (G))
| Size | Nominal size (in) | Major diameter (mm) | Pitch (mm) | Threads per inch (TPI) | Tap drill (mm) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| G1/16 | 1/16 | 7.723 | 0.907 | 28 | 6.8 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1/8 | 1/8 | 9.728 | 0.907 | 28 | 8.8 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1/4 | 1/4 | 13.157 | 1.337 | 19 | 11.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G3/8 | 3/8 | 16.662 | 1.337 | 19 | 15.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1/2 | 1/2 | 20.955 | 1.814 | 14 | 18.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G5/8 | 5/8 | 22.911 | 1.814 | 14 | 20.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G3/4 | 3/4 | 26.441 | 1.814 | 14 | 24.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G7/8 | 7/8 | 30.201 | 1.814 | 14 | 27.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1 | 1 | 33.249 | 2.309 | 11 | 30.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1-1/8 | 1-1/8 | 37.897 | 2.309 | 11 | 35.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1-1/4 | 1-1/4 | 41.91 | 2.309 | 11 | 39.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1-1/2 | 1-1/2 | 47.803 | 2.309 | 11 | 45.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G1-3/4 | 1-3/4 | 53.746 | 2.309 | 11 | 51.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G2 | 2 | 59.614 | 2.309 | 11 | 57.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G2-1/4 | 2-1/4 | 65.71 | 2.309 | 11 | 63.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G2-1/2 | 2-1/2 | 75.184 | 2.309 | 11 | 72.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G2-3/4 | 2-3/4 | 81.534 | 2.309 | 11 | 79.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G3 | 3 | 87.884 | 2.309 | 11 | 85.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G3-1/2 | 3-1/2 | 100.33 | 2.309 | 11 | 97.5 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G4 | 4 | 113.03 | 2.309 | 11 | 110.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G5 | 5 | 138.43 | 2.309 | 11 | 135.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
| G6 | 6 | 163.83 | 2.309 | 11 | 160.0 | ISO 228-1 / DIN ISO 228 | Parallel pipe thread (G), sealed by gasket |
Materials & Finishes
Common materials include carbon steel (typically zinc plated or hot-dip galvanized), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.
Typical Applications
Connecting pipe, hose and tubing in hydraulic, pneumatic and fluid-transfer systems.
Related Fasteners
Pricing
BSP Pipe Thread Fittings are stocked and supplied to order. Pricing starts from approximately US$0.20 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Request a quotation below for your exact specification.
Request a Quotation for BSP Pipe Thread Fittings
Tell us the size, material, finish and quantity you need for BSP Pipe Thread Fittings (ISO 228 (G)) and our team will respond within one business day.