This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X50-50S, 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 ACPJ12X50-50S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X50-50S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 50mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X50-50S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X50-50S
- 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 ACPJ12X50-50S
Double acting and adjustable, the ACPJ12X50-50S is a discontinued DIN-standard compact cylinder with a 12 mm bore and a 50 mm stroke that a stop screw can trim anywhere in a 0-50 mm window. Air drives the rod out and back, a fixed TPU bumper decelerates each end, and the hard-anodized aluminium body with an S45C hard-chrome 6 mm rod runs at 0.15-1.0 MPa (22-145 psi) and 30-500 mm/s. Push force is 56.5 N and pull 42.4 N at 0.5 MPa.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures, pick heads and test rigs. Because the -S magnet is fitted, CMSE or DMSE reed and solid-state switches can be clamped straight onto the tube for end-of-stroke signals. For sizing, plan on roughly 34 N of usable push at 0.5 MPa (about 60% of the rating), which lifts around 3.5 kg vertically - halve that to about 1.7 kg for a 2:1 margin. This model is discontinued; the current drop-in is ACEJ12X50, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-50S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-50S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X50-50S |
| Bore size | Ø12 mm |
| Stroke | 50 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 ACEJ12X50-50S (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 ACPJ12X50-50S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 ACPJ12X50-50S Is Used
Lab sample ejector
The 56.5 N push at 0.5 MPa ejects microplates or vials from a holder, and the fitted magnet signals home via a CMSE switch.
Small-part press fit
About 34 N of usable force seats pins or bushings in electronics assemblies, with the stroke trimmed to the exact press depth.
Gantry drop check
A 12 mm bore probe with the -S magnet and DMSE switch confirms part presence on compact pick-and-place heads where length is critical.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-50S with the ACEJ12X50-50S
At 12 mm bore this is the smallest ACPJ size: 56.5 N push / 42.4 N pull at 0.5 MPa, with 79.2 N / 59.4 N available at 0.7 MPa. If your load needs more, step up to the 16 mm bore (100.5 N push at 0.5 MPa) or the 20 mm bore (157.1 N). The stop screw only shortens the extend stroke - it is not a mid-stroke lock, so the rod can drift if air is lost. FA/FB flange and LB foot mountings bolt to the standard face, and the fitted -S magnet accepts CMSE / DMSE switches. Order ACEJ12X50 as the current-production replacement.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X50-50S
- ✓ 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 ACPJ12X50-50S 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; theoretical maximum is 11.5 kgf at 1.0 MPa. In practice plan on about 34 N of usable push at 0.5 MPa, which lifts roughly 1.7 kg vertically with a 2:1 margin. The 50 mm extend stroke is adjustable down to 0 mm via the stop screw, and the model is discontinued - order ACEJ12X50 instead.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with FA/FB flange or LB foot mounting and an M5x0.8 port. This -S version carries the optional magnet, so CMSE / DMSE reed or solid-state switches mount directly on the tube. A fixed TPU bumper decelerates both ends but does not hold a load; confirm ISO 21287 dimensions before switching to the ACEJ12X50 replacement.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X50-50S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X50-50S replacement — usually within 7-8 hours.