SMC’s CJ2 series is a compact, round-body pneumatic air cylinder line built in three bore sizes only, 6mm, 10mm and 16mm, for tight spaces on assembly machines, pick-and-place units and small automation modules. Paired with SMC D-M9 series solid state auto switches, which clip directly into a mounting groove on the cylinder body with no separate bracket, the CJ2 gives fast, reliable position feedback for a PLC or controller. RendatSP supplies both as genuine SMC parts, sourced against the original SMC part number, with worldwide shipping and local agents across Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
Which Bore Size Do I Need?
| Bore | Rod diameter | Standard strokes | Typical use |
|---|---|---|---|
| 6 mm | 4 mm | 15, 30, 45, 60 mm | Very light parts handling, small stoppers, sensor positioning |
| 10 mm | 6 mm | 15 to 100 mm | Light clamping, small gate and flap actuation |
| 16 mm | 8 mm | 15 to 200 mm | General light-duty positioning and clamping tasks |
Reading a CJ2 Part Number
Example: CJ2B16-45
- CJ2 – SMC CJ2 series miniature air cylinder
- B – Basic (through-hole) mounting
- 16 – 16 mm bore
- 45 – 45 mm stroke
Other mounting styles SMC offers on the CJ2 body: E (double-side bossed), L (single foot), M (double foot), F (rod flange), G (head flange), D (double clevis). Contact RendatSP with your original SMC code if your machine uses one of these.
Reading a D-M9 Auto Switch Part Number
Example: D-M9NV-M
- D- – SMC auto switch prefix
- M9 – D-M9 series, direct/band mounting
- N – 3-wire NPN output (B = 2-wire, N = 3-wire NPN, P = 3-wire PNP)
- V – perpendicular electrical entry (omit for in-line entry)
- -M – 1 m lead wire (omit for 0.5 m, L for 3 m, Z for 5 m)
SMC CJ2 Mini Air Cylinder Range
| Part number | Bore | Stroke |
|---|---|---|
| CJ2B6-15 | 6 mm | 15 mm |
| CJ2B6-30 | 6 mm | 30 mm |
| CJ2B6-45 | 6 mm | 45 mm |
| CJ2B6-60 | 6 mm | 60 mm |
| CJ2B10-15 | 10 mm | 15 mm |
| CJ2B10-30 | 10 mm | 30 mm |
| CJ2B10-45 | 10 mm | 45 mm |
| CJ2B10-60 | 10 mm | 60 mm |
| CJ2B10-75 | 10 mm | 75 mm |
| CJ2B10-100 | 10 mm | 100 mm |
| CJ2B16-15 | 16 mm | 15 mm |
| CJ2B16-30 | 16 mm | 30 mm |
| CJ2B16-45 | 16 mm | 45 mm |
| CJ2B16-60 | 16 mm | 60 mm |
| CJ2B16-75 | 16 mm | 75 mm |
| CJ2B16-100 | 16 mm | 100 mm |
| CJ2B16-125 | 16 mm | 125 mm |
| CJ2B16-150 | 16 mm | 150 mm |
SMC D-M9 Auto Switch Range
| Part number | Wiring | Electrical entry |
|---|---|---|
| D-M9B-M | 2-wire | In-line (grommet) |
| D-M9BV-M | 2-wire | Perpendicular (grommet) |
| D-M9N-M | 3-wire, NPN | In-line (grommet) |
| D-M9NV-M | 3-wire, NPN | Perpendicular (grommet) |
| D-M9P-M | 3-wire, PNP | In-line (grommet) |
| D-M9PV-M | 3-wire, PNP | Perpendicular (grommet) |
Frequently Asked Questions
What bore sizes does the SMC CJ2 series come in?
Three sizes only: 6mm, 10mm and 16mm, covering strokes from 15mm up to 200mm depending on bore.
Can I mount an auto switch without a bracket?
Yes. Both the CJ2 cylinder body and compatible SMC round-body cylinders have a built-in switch mounting groove, so D-M9 series switches band-mount directly with no bracket.
Whats the difference between D-M9B, D-M9N and D-M9P?
D-M9B is a 2-wire switch, D-M9N is a 3-wire NPN switch, and D-M9P is a 3-wire PNP switch, matching different PLC input types.
What lead wire lengths are available for D-M9 switches?
0.5 m (no letter), 1 m (M), 3 m (L) and 5 m (Z). RendatSP stocks the 1 m version and can source the others on request.
Does the CJ2 cylinder need lubrication?
No, it ships pre-lubricated and does not require an external lubricator for normal operation.
What other CJ2 mounting styles are available?
Besides Basic (through-hole), SMC offers double-side bossed, single foot, double foot, rod flange, head flange and double clevis mounting; contact RendatSP for these.
What is the maximum operating pressure of the CJ2 series?
Up to 0.7 MPa, with a 1 MPa proof pressure, for the standard double acting configuration.
Are these genuine SMC parts?
Yes. RendatSP supplies genuine SMC CJ2 cylinders and D-M9 auto switches sourced against the original SMC part numbers.
Can the D-M9 switch be used on cylinders other than CJ2?
Yes, D-M9 switches fit any SMC round-body cylinder with a matching mounting groove, including CQ2, CDQ2, MB and many other compact SMC series.
How do I order the exact variant my machine needs?
Send RendatSP your machine model or the original SMC part number (or the closest code from this guide) by WhatsApp, and the team will confirm the exact match, stock and delivery time.