This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X40-20B, 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 ACPJ12X40-20B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X40-20B 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 ACEJ12X40-20B (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 → ACEJ12X40-20B
- 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 ACPJ12X40-20B
The ACPJ12X40-20B is a double acting compact cylinder with an adjustable stroke: a stop screw trims the 40 mm extend stroke by up to 20 mm, giving a usable range of 20-40 mm on site. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N at 0.7 MPa, with a theoretical maximum of 11.5 kgf at 1.0 MPa. Its ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit.
The B code gives a male 6 mm rod with a male rod thread, and the 12 mm bore ports are M5x0.8. As a rule of thumb, plan on roughly 34 N of real work at 0.5 MPa (about 60% of the push rating), which lifts about 3 kg vertically with a 2:1 margin. Note this unit is discontinued: the current-production replacement is the ACEJ12X40, so confirm the ISO 21287 mounting dimensions before swapping. The optional -S magnet enables CMSE / DMSE switches; this code has no magnet fitted.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X40-20B |
| 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 ACEJ12X40-20B (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 ACPJ12X40-20B
| 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 ACPJ12X40-20B Is Used
Small-parts ejection in plastic molding
The 20-40 mm adjustable extend stroke lets a technician dial in the exact eject distance for shallow cavities, with 56.5 N enough to clear lightweight ABS parts.
Bench-top press verification fixture
A 12 mm bore pushing 79.2 N at 0.7 MPa suits go/no-go snap checks on connector housings; order the -S magnet to add CMSE / DMSE end-position switches.
Micro stopper gate on electronics conveyor
The male-thread 6 mm rod mounts a stop blade directly, and the short ISO 21287 body fits under low conveyor frames where an ISO 15552 profile cylinder cannot.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-20B with the ACEJ12X40-20B
Size both ways: if 56.5 N push 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 shorter fixed-stroke ACP may suffice. The 20 mm window means the extend stroke can be set anywhere from 20 to 40 mm, but the stop screw is a mechanical end stop only - it never holds a load if air is lost. FA/FB flange and LB foot mountings bolt to the ISO 21287 face. Order the -S code if you need CMSE / DMSE switch positions. Replacement: ACEJ12X40.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X40-20B
- ✓ 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 ACPJ12X40-20B 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 11.5 kgf at 1.0 MPa. The -20 code gives a 20 mm window: the stop screw trims the 40 mm extend stroke down to 20 mm. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), -20 to +70 C, speed 30-500 mm/s, with a fixed TPU bumper at both ends and an M5x0.8 port.
The ACPJ family is no longer in production. The current drop-in is the ACEJ12X40 (swap the P for an E), which matches the same 12 mm bore, 40 mm stroke and force class in the ISO 21287 series. Because the ACP was DIN-standard, confirm the ISO 21287 mounting dimensions before swapping, and remember the magnet is the optional -S code, not a built-in feature.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X40-20B
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