This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X50-20S, 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 ACPJ12X50-20S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X50-20S 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 ACEJ12X50-20S (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 → ACEJ12X50-20S
- 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 ACPJ12X50-20S
Double acting compact cylinder with an adjustable stroke, the ACPJ12X50-20S carries a 12 mm bore and 50 mm stroke, and its -20 code gives a 20 mm adjustment window: a stop screw trims the extend stroke on site, so the usable range is 30-50 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N / 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it fits tight jigs and guard spaces.
Plan on roughly 34 N (about 0.6 of the push force) of real work at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. The hard-anodized aluminium body pairs with an S45C hard-chrome rod, fixed TPU bumpers sit at both ends, and the fitted -S magnet accepts CMSE / DMSE switches. Note that this model is discontinued: the current-production replacement is ACEJ12X50, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X50-20S |
| 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 ACEJ12X50-20S (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 ACPJ12X50-20S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -20 | 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 ACPJ12X50-20S Is Used
Small-parts ejection from assembly jigs
The 30-50 mm trimmed extend stroke nudges a finished connector or pin off a fixture; 56.5 N at 0.5 MPa is enough for parts under about 2.9 kg lifted vertically.
Position-checked test stations
With the fitted -S magnet, CMSE or DMSE switches confirm end-of-stroke on a PCB or sensor test bench, and the stop screw dials the exact probe travel.
Light clamping in compact fixtures
About 34 N of usable clamping force at 0.5 MPa holds small brackets or covers during a screwdriving step, inside a body roughly half the length of an ISO 15552 profile cylinder.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20S with the ACEJ12X50-20S
Size both ways: if 56.5 N at 0.5 MPa is marginal, step up to the 16 mm bore for 100.5 N; if the load is lighter, the same 12 mm bore in a fixed-stroke ACP may be enough. The stop screw only shortens the extend stroke within the 20 mm window and does not lock the piston - on air loss the rod still drifts, so add a separate brake if you must hold a load. FA/FB flange and LB foot mountings bolt to the standard face, and the fitted -S magnet lets you add CMSE / DMSE switches. Order ACEJ12X50 as the current drop-in.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X50-20S
- ✓ 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 ACPJ12X50-20S FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa, 79.2 N push and 59.4 N pull; theoretical maximum is 11.5 kgf at 1.0 MPa. For sizing, count on about 34 N of real work at 0.5 MPa, which lifts roughly 2.9 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, air filtered to 40 um, temperature -20 to +70 C.
The -20 code is a 20 mm adjustment window: an external stop screw shortens the 50 mm extend stroke on site, giving a usable range of 30-50 mm. It is a mechanical end stop only - it never holds a load if air is lost. This ACPJ is discontinued; the current-production replacement is ACEJ12X50, a drop-in in the same bore, stroke and force class. Confirm the ISO 21287 mounting dimensions before swapping, since the ACP follows the older DIN-standard footprint.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X50-20S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X50-20S replacement — usually within 7-8 hours.