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G 2-1/2 male parallel thread (ISO 228-1) envelope
G 2-1/2 male parallel thread (ISO 228-1) envelope: cylinder at the nominal major diameter Ø75.184, 20 mm long (EXAMPLE thread length, our choice); then an EXAMPLE EN 10255 medium tube stub OD Ø76.1 x 3.65 wall, 30 mm long; bore Ø68.8 through; the thread is a smooth cylinder, not helical
Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.
STEP STL free, CC BY 4.0 (credit "Xem Studio")
Dimensions
| size | G 2-1/2 |
|---|---|
| TPI | 11 |
| pitch P, mm | 2.309 |
| major Ø d, mm | 75.184 |
| pitch Ø d2, mm | 73.705 |
| minor Ø d1, mm | 72.227 |
| external d2 class A min, mm | 73.488 |
| external d2 class B min, mm | 73.271 |
| internal d2 max, mm | 73.922 |
| external major min, mm | 74.75 |
| source | MachiningDoctor |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.From the full sheet
BSP parallel pipe threads G 1-1/4 to G 6 (ISO 228-1): pitch, major, pitch and minor diameter, class A / B limits + 6 male STEP/STL files: every size, notes, mating features and sources. What are the dimensions of a G 1-1/4, G 2 or G 3 BSPP parallel pipe thread: TPI, pitch, major diameter, pitch diameter, minor diameter and class A limits?