This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X40-20S, 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 ACPJ12X40-20S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X40-20S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 40mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X40-20S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X40-20S
- 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 ACPJ12X40-20S
Double acting and adjustable, the ACPJ12X40-20S is a DIN-standard compact cylinder with a 12 mm bore and 40 mm stroke. A stop screw trims the extend stroke by up to 20 mm on site, giving a usable range of 20-40 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 and 59.4 N, with a theoretical 11.5 kgf at 1.0 MPa. The -S code means the magnet is fitted, so CMSE or DMSE reed and solid-state switches can be clamped straight onto the body for end-of-stroke signalling.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into cramped jigs and guarding where a full-length body will not go. In practice, plan for roughly 34 N of real work at 0.5 MPa (about 0.6 of the push rating), which lifts around 3.5 kg vertically; halving again for a 2:1 margin gives a safe lift of about 2.9 kg. Note this model is discontinued: the current-production replacement is ACEJ12X40, so confirm ISO 21287 mounting dimensions before swapping, since the ACP was built to DIN-standard dimensions.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X40-20S |
| Bore size | Ø12 mm |
| Stroke | 40 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 ACEJ12X40-20S (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 ACPJ12X40-20S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 ACPJ12X40-20S Is Used
Small-part ejection from press dies
The 56.5 N push at 0.5 MPa clears stamped terminals and connector pins off a die face, while the 20-40 mm adjustable range lets the toolmaker dial in the exact eject position without shimming.
Position-verified gate latch on a lab autosampler
With the fitted -S magnet and a CMSE switch, the PLC confirms the 6 mm rod has fully retracted before the sample arm moves, at cycle speeds up to 500 mm/s.
Light hold-down of PCBs in a test fixture
About 34 N of usable clamping force at 0.5 MPa is enough to seat a circuit board against pogo pins, and the compact body fits inside the fixture lid where a full-length cylinder cannot.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20S with the ACEJ12X40-20S
At 12 mm bore this is the smallest force class in the family: 56.5 N push at 0.5 MPa. Step up to the 16 mm bore (100.5 N push) if the load needs nearly double, or stay here for light clamping and indexing. The 20 mm adjustment window suits fixtures where the final position is tuned after installation; remember the stop screw only shortens the extend stroke and drifts on air loss, so it is not a load-holding lock. The female M3x0.5 rod thread takes I/Y knuckles, FA/FB flanges and LB feet bolt to the face, and the fitted -S magnet pairs with CMSE/DMSE switches. Order the ACEJ12X40 as the current drop-in.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X40-20S
- ✓ 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 ACPJ12X40-20S 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 -20 code gives a 20 mm adjustment window, so the 40 mm extend stroke can be trimmed anywhere down to 20 mm with the external stop screw. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the M5x0.8 port depends only on the 12 mm bore.
No - the ACPJ family is discontinued. The current-production drop-in is ACEJ12X40 (swap the P for an E), which matches the same 12 mm bore, 40 mm stroke and force class in the ISO 21287 short-body format. Because the ACP was built to DIN-standard dimensions, confirm the ISO 21287 mounting hole pattern and overall length against your fixture before ordering. This unit carries the optional -S magnet for CMSE/DMSE switches, and the fixed TPU bumpers at both ends simply decelerate the piston at each end of travel.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X40-20S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X40-20S replacement — usually within 7-8 hours.