This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X45-50, the same code under the new prefix. The ACE replacement is a current-production ISO 21287 compact cylinder in the same bore, stroke and force class, with a matching short body and the same mounting-accessory family, so it fits the same envelope. Confirm mounting-interface dimensions against the ACE datasheet before ordering.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X45-50 is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 45mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X45-50 (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke45 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X45-50
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50
The ACPJ12X45-50 is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 45 mm stroke on site within the ordered 50 mm window, giving a usable range of 0-45 mm. At 0.5 MPa the 12 mm bore delivers 56.5 N push and 42.4 N pull, rising to 79.2 N push at 0.7 MPa. Its short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into cramped fixtures and guarding where a full-length body will not fit.
For sizing, plan on roughly 34 N (about 3.4 kgf) of real work at 0.5 MPa, or expect it to lift about 2.9 kg vertically with a 2:1 margin. A fixed TPU bumper at both ends decelerates the piston, and the adjuster is a mechanical end stop only - it never holds a load if air is lost. This model is discontinued; the current-production replacement is the ACEJ12X45, so confirm ISO 21287 mounting dimensions before swapping. The optional -S code adds the magnet needed for CMSE / DMSE switches; without it no sensor can be mounted.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X45-50 |
| Bore size | Ø12 mm |
| Stroke | 45 mm |
| Acting type | Double acting, double rod, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M3×0.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Fixed bumper (both ends) |
| Max standard stroke | Up to 50 mm |
Specifications follow the official AirTAC ACP datasheet (now discontinued). The ACEJ12X45-50 (ISO 21287) carries the same bore/stroke/force class; confirm mounting-interface dimensions against the ACE datasheet before installation. Rod type: female thread (blank) or male thread (B). Thread options: PT (blank) / G.
Theoretical Output Force (Ø12mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 42 N |
| 0.7 MPa | 59 N |
| Max (@1.0 MPa) | 9 kgf |
ACPJ is double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | Stroke length in mm. |
| -50 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| S | Optional built-in magnet for sensor position sensing (omit for no magnet). |
| B | Rod type: B = male thread; blank = female thread. |
Replacement mapping (swap P for E): ACP→ACE, ASP→ASE, ATP→ATE, ACPD→ACED, ACPJ→ACEJ. ACP-family: ACP (double acting), ASP / ATP (single acting push / pull), ACPD (double rod), ACPJ (double rod, adjustable stroke).
Where the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50 Is Used
Small-part ejection from micro molds
The 56.5 N push at 0.5 MPa is enough to kick tiny molded clips or pins off a mold face, and the 0-45 mm adjustable range lets the operator dial the eject distance to the part.
Indexing stop on a compact conveyor
Mounted under a narrow conveyor frame, the short body fits where a full-length cylinder cannot, and with the optional -S magnet a CMSE switch confirms the stop is extended.
Sample press in a lab dosing station
The 42.4 N pull at 0.5 MPa retracts a light probe or sealing pad between dosing cycles at 30-500 mm/s, with the TPU bumper softening each end of travel.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50 with the ACEJ12X45-50
Choose this bore when your load needs up to about 34 N of usable force at 0.5 MPa; step up to the 16 mm bore (100.5 N push at 0.5 MPa) for heavier work or down to nothing smaller - 12 mm is the smallest ACPJ bore. The 45 mm stroke sits inside the 50 mm maximum standard stroke for this bore, so no made-to-order stroke is needed. Order the -S variant if you need position sensing with CMSE / DMSE switches, and pick FA/FB flange or LB foot mounting to match your fixture. Since this model is discontinued, spec the ACEJ12X45 as the drop-in successor and verify the ISO 21287 mounting footprint.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X45-50
- ✓ Same bore / stroke / force class
- ✓ Confirm ISO 21287 mounting dimensions
- ✓ Port/thread type (PT / G)
- ✓ Add -S for magnet if you need sensors
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50 FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The 12 mm bore has a 6 mm rod with an M3x0.5 female thread, an M5x0.8 port, operating pressure 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s and a 50 mm maximum standard stroke.
The -50 code is a 50 mm adjustment window: an external stop screw shortens the 45 mm extend stroke on site, so you can set any usable stroke from 0 to 45 mm. It is a mechanical end stop, not a mid-stroke lock, so the piston still drifts if air is lost. The ACPJ12X45-50 is discontinued; the ACEJ12X45 is the current-production drop-in with the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X45-50
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X45-50 replacement — usually within 7-8 hours.