- Join the NMRA
- About the NMRA
- Education
- Resources
- Community
Search NMRA.org
RP-21.1 Coupler Contour
This sheet has been prepared in order to establish the basis for compatibility amongst the greatest number of couplers adhering to generally prototypical appearance.
Dimensions in this sheet will be found to be in agreement with RP-21.2 where dimensions are repeated.
| SCALE | A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|---|
| HO | 0.010 | 0.100 | 0.045 | 0.200 ------- 0.210 | 0.005 | 0.055 | 0.025 | 0.065 |
| SCALE | I | K | L | N | O | P | Q | R |
|---|---|---|---|---|---|---|---|---|
| HO | 0.015 | 0.035 | 0.005 | 0.010 | 0.010 | 0.015 | 0.035 | 0.020R |
| SCALE | S | T | U | V | W | X |
|---|---|---|---|---|---|---|
| HO | 0.010R | 0.030R | 0.020R | 0.020R | 0.030R | 0.020R |