This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X70-40, 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 ACPJ12X70-40
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X70-40 is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 70mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X70-40 (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke70 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X70-40
- 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 ACPJ12X70-40
The ACPJ12X70-40 is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 70 mm stroke by up to 40 mm on site, giving a usable range of 30-70 mm. This 12 mm bore unit delivers 56.5 N push and 42.4 N pull at 0.5 MPa (79.2 N / 59.4 N at 0.7 MPa), with a theoretical peak of 11.5 kgf at 1.0 MPa. Its hard-anodized aluminium body and S45C hard-chrome rod run on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s.
The short ISO 21287-class body saves roughly 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 70 mm stroke exceeds the 50 mm standard maximum for bore 12, so it is a made-to-order build. Note the adjuster is a mechanical end stop only - on air loss the piston still drifts, so it never holds a load. This model is discontinued; the current-production drop-in is the ACEJ12X70, and buyers should confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X70-40 |
| Bore size | Ø12 mm |
| Stroke | 70 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 ACEJ12X70-40 (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 ACPJ12X70-40
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -40 | 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 ACPJ12X70-40 Is Used
Small-part ejection from plastic molds
The 30-70 mm trim range and 56.5 N push at 0.5 MPa suit nudging finished clips or caps off a mold table where space beside the tool is minimal.
Gate and latch actuation on compact enclosures
A 42.4 N pull at 0.5 MPa swings light interlock gates on inspection cabinets; add the -S magnet code if you later need CMSE / DMSE position feedback.
Sample pusher in lab automation
The 6 mm rod and M5x0.8 ports fit micro slide assemblies that index vials or slides, with the stop screw set to a repeatable trimmed stroke.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40 with the ACEJ12X70-40
At 12 mm bore this is the smallest force class in the range: 56.5 N push at 0.5 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 push at 0.5 MPa). For a real-world margin, plan on about 34 N of usable work at 0.5 MPa, which corresponds to lifting roughly 1.7 kg vertically with a 2:1 safety factor. Mounting is FA/FB flange or LB foot; the rod end here is female M3x0.5, and the male-thread B variant is available if your tooling needs it. No magnet is fitted on this code - order the -S version if you need CMSE / DMSE switch positions. Since the ACPJ is discontinued, spec the ACEJ12X70 as the current replacement and verify the ISO 21287 footprint.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X70-40
- ✓ 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 ACPJ12X70-40 FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa it reaches 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um, moves at 30-500 mm/s over a 30-70 mm trimmed stroke, and uses M5x0.8 ports with a female M3x0.5 rod thread. The 70 mm stroke is a made-to-order length above the 50 mm standard maximum for bore 12.
The -40 code sets a 40 mm adjustment window: an external stop screw shortens the extend stroke anywhere within it, so you can dial the effective stroke between 30 and 70 mm without changing cylinders. It is a mechanical end stop, not a mid-stroke lock, so the rod can drift if air is lost. Fixed TPU bumpers decelerate both ends. The ACPJ family is discontinued; the ACEJ12X70 is the current ISO 21287 drop-in in the same bore, stroke and force class - confirm its mounting dimensions before converting.
Related AirTAC ACE Cylinders
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