SMC offers multiple options for KQ2 one-touch fittings. The options are called "X-Options" and can be added to KQ2 One-touch fitting part numbers adding to their functionality. Below is a list of SMC KQ2 One-touch fitting X-options.
Made to Order/Clean Series/Spare Parts
Made to Order:
| Symbol | Specification |
| X12 |
Lubricant: White Vaseline Release button color: White |
| X35 |
Body Color: Black Release button color: Light gray |
| X41 | With fixed orifice |
| X17 |
Grease-free Rubber material: NBR (With fluorine coating) Release button color: Light blue |
| X29 |
Grease-free Rubber material: NBR (With fluorine coating) Release button color: Light blue Copper-free (with electroless nickel plating) |
| X34 | Rubber material: FKM |
| X39 |
Grease-free Rubber Material: NBR (With fluorine coating) Release button color: Light blue Clean (Copper-free, air blow, double packaging, resin body: white) |
| X94 |
Grease-free Rubber material: FKM (With fluorine coating) Release button color: Light blue |
Clean Series:
| Symbol | Specifications |
| 10- |
Brass parts: With electroless nickel plating Lubricant: Fluorine grease Air blow in clean room Double Packaging Resin body, Release button color: White |
Spare Parts:
| Description | Part No. | Applicable Thread |
| Gasket | M-3G2 | M3 |
| M-5G2 | M5 | |
| M-6G |
M6 |
Brass
| Description | Part No. | Applicable Model |
| Pipe Nut | KQ04-P01A | KQ2E23-00A1, KQ2E04-00A1, KQ2E23-02A1 |
| KQ2E04-01A1, KQ2E04-02A1, KQ2LE04-00A1 | ||
| KQ06-P01A | KQ2E06-00A1, KQ2E06-01A1, KQ2E06-02A1 | |
| KQ2E06-03A1, KQ2LE06-00A1 |
Brass + Electroless Nickel Plating
| Description | Part No. | Applicable Model |
| Pipe Nut | KQ04-P01N | KQ2E23-00N1, KQ2E04-00N1, KQ2E23-02N1 |
| KQ2E04-01N1, KQ2E04-02N1, KQ2LE04-00N1 | ||
| KQ06-P01N | KQ2E06-00N1, KQ2E06-01N1, KQ2E06-02N1 | |
| KQ2E06-03N1, KQ2LE06-00N1 |