Material specification page for bsp pipe thread fittings in A2 Stainless Steel. Covers the grade designation (A2-70 (304)), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 228 (G).
Why Choose A2 Stainless Steel for BSP Pipe Thread Fittings
The most common stainless grade for indoor and general outdoor fasteners. For bsp pipe thread fittings, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A2-70 (304) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Good general corrosion resistance |
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for BSP Pipe Thread Fittings in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For BSP Pipe Thread Fittings, the alternative stainless grade is A4 (316). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of BSP Pipe Thread Fittings Available in A2 Stainless Steel
| 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 |