.
| GL | GD | GDM |
| Metal button | Metal indicator | Metal buzzer |
. Mounting aperture
. Shape
| B | BA | BC | BE |
| Spherical (Long shell) | Spherical (Short shell) | Big (Big head) | Spherical Round coat) |
| BF | BP | ||
| Spherical (Square shell) | Spherical (Half plastic) |
| F | FA | FC |
| Flat button(Long shell) | Flat button(Short shell) | Big (Big head) |
| FE | FF | |
| Flat button（Round coat) | Flat button（Square coat) |
| H | HA | HE |
| High button(Long shell) | High button(Short shell) | High button（Round coat) |
| HF | ||
| High button（Square coat) |
| T | X | XS |
| Maintained push button | 2-Postion selector button | 3-Postion selector button |
| M | Y | YS |
| Mushroom push button | 2-Postion key lock button | 3-Postion key lock button |
| Z | ZC | |
| Emergency stop button | Emergency stop button(Big head) |
| E | D | S |
| Annul | Single point | Power indication |
4. Voltage:AC.DC
| 21 | 22 | 23 | 24 |
| 6V | 12V | 24V | 36V |
| 25 | 26 | 27 | 28 |
| 48V | 110V | 127V | 220V |
5. Shell material
| A | P | N |
| Aluminium alloy | plastic | Copper chromium piating |
| S | ||
| Stainless steel |
6. Connection mode:
| J | X | NO |
| Welding | Belt line | Default Terminal |
