This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X40-20, 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 ACPJ12X40-20
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X40-20 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 ACEJ12X40-20 (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 → ACEJ12X40-20
- 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 ACPJ12X40-20
The ACPJ12X40-20 is a double acting compact cylinder with an adjustable extend stroke: the -20 code gives a 20 mm stop-screw window, so the 40 mm stroke can be trimmed on site anywhere between 20 and 40 mm. Air pushes the piston both ways, delivering 56.5 N forward and 42.4 N back at 0.5 MPa, rising to 79.2 N forward at 0.7 MPa. Its short ISO 21287-class body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into slim jigs and guarded stations where a full-length body will not fit.
Practical sizing: plan on about 34 N of usable push at 0.5 MPa (roughly 60% of the rating), which lifts about 3 kg vertically - and about 1.5 kg with a 2:1 margin for a real part such as a small bracket or sensor head. The hard-anodized aluminium body carries an S45C hard-chrome rod with a female M3x0.5 thread, and fixed TPU bumpers decelerate both ends. Note this model is discontinued: the current drop-in is the ACEJ12X40 (swap the P for an E), so confirm ISO 21287 mounting dimensions before ordering.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X40-20 |
| 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 ACEJ12X40-20 (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 ACPJ12X40-20
| 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 ACPJ12X40-20 Is Used
Small-part ejection from a mold or nest
The 56.5 N push at 0.5 MPa is enough to tip a molded connector or stamped clip off a nest, and the 20-40 mm trim range lets the operator tune the eject travel without changing the cylinder.
Presence check on an electronics assembly line
A short probe stroke between 20 and 40 mm verifies a PCB or connector is seated; order the -S magnet version if CMSE or DMSE switch feedback is needed on the trimmed stroke.
Light clamping inside a compact fixture
With about 34 N of practical clamp force and a body roughly half the length of an ISO 15552 profile cylinder, it clamps thin sheet or small housings in tight fixture pockets.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20 with the ACEJ12X40-20
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 for 100.5 N push or the 20 mm bore for 157.1 N at the same pressure if the load is heavier. The stop screw only shortens the extend stroke and does not hold a load on air loss, so add an external stop if position must be retained. Mounting uses FA/FB flanges or LB feet on the standard face, and position sensing requires the optional -S magnet code with CMSE / DMSE switches - this version has no magnet fitted. For new designs, order the ACEJ12X40 instead.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X40-20
- ✓ 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 ACPJ12X40-20 FAQ
Push is 56.5 N and pull is 42.4 N at 0.5 MPa; at 0.7 MPa push rises to 79.2 N and pull to 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 20 mm adjustment window on the 40 mm stroke, runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, M5x0.8 ports and a female M3x0.5 rod thread. The model is discontinued; the ACEJ12X40 is the current replacement.
It is a short-body compact cylinder in the ISO 21287 class, saving about 50% of the mounting length of an ISO 15552 profile cylinder, so it fits narrow jigs and guarded stations. The -20 stop screw trims the extend stroke anywhere from 20 to 40 mm; it is a mechanical end stop only and will not lock the piston if air is lost. Fixed TPU bumpers decelerate both ends of travel, and FA/FB flange or LB foot mounts bolt to the standard face. Confirm ISO 21287 dimensions before swapping to the ACEJ12X40.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X40-20
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X40-20 replacement — usually within 7-8 hours.