This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X70-40S, 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 ACPJ12X70-40S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X70-40S 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 ACEJ12X70-40S (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 → ACEJ12X70-40S
- 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 ACPJ12X70-40S
The ACPJ12X70-40S is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the ordered 70 mm stroke by up to 40 mm, giving a usable range of 30-70 mm on site. The 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. Its 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. Note that the 70 mm stroke exceeds the 50 mm maximum standard stroke for bore 12, so this unit is a made-to-order build.
A fixed TPU bumper at each end decelerates the piston, and the optional -S magnet fitted to this model allows CMSE or DMSE reed and solid-state switches for end-position sensing. The hard-anodized aluminium body pairs with an S45C hard-chrome rod and a female M3x0.5 rod thread; ports are M5x0.8. As a rule of thumb, plan on about 34 N (roughly 3 kg vertical lift) of real work at 0.5 MPa rather than the full 56.5 N rating. This ACPJ series is discontinued - the current-production drop-in is the ACEJ12X70, so confirm the ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X70-40S |
| 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 ACEJ12X70-40S (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 ACPJ12X70-40S
| 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 ACPJ12X70-40S Is Used
Micro-part ejection from a jig
A 12 mm bore pushing 56.5 N at 0.5 MPa ejects small machined pins or bushings from a drilling fixture, with the 40 mm window letting one setup serve several jig depths.
Position-verified gate on a lab bench
With the fitted -S magnet driving a CMSE switch, the 30-70 mm trimmed stroke confirms a small sliding cover or sample tray has reached its end position before the next step.
Light clamping of electronics housings
About 34 N of practical force at 0.5 MPa holds a plastic enclosure or PCB carrier steady during a screwdriving or test cycle, inside a frame too short for a full-length profile cylinder.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40S with the ACEJ12X70-40S
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 and space is tighter, the same 12 mm bore in a shorter fixed-stroke ACP may suffice. The 40 mm window suits stations where one cylinder must serve varying part heights - set the stop once, and remember it shortens the extend stroke only; it is a mechanical end stop, not a mid-stroke lock, so the piston still drifts on air loss. Mount via FA/FB flange or LB foot, and keep the -S magnet if you need CMSE / DMSE switch feedback. For new builds, order the ACEJ12X70 instead - this ACPJ model is discontinued.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X70-40S
- ✓ 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 ACPJ12X70-40S 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; theoretical maximum is 11.5 kgf at 1.0 MPa. It is a double acting adjustable-stroke cylinder, 12 mm bore, 70 mm stroke with a 40 mm trim window (usable 30-70 mm), rod 6 mm with female M3x0.5 thread, M5x0.8 ports, speed 30-500 mm/s, pressure 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), temperature -20 to +70 C, and a fixed TPU bumper at both ends. The 70 mm stroke is a made-to-order length since bore 12 tops out at 50 mm standard.
This unit carries the optional -S magnet, so CMSE or DMSE reed and solid-state switches can be clamped to the body for extend and retract signals. The ACPJ family is discontinued; the current-production replacement is the ACEJ12X70, an ISO 21287 compact cylinder in the same bore, stroke and force class. Because the ACP is DIN-standard, verify the ISO 21287 mounting dimensions against your fixture before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X70-40S
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