This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X70-20B, 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 ACPJ12X70-20B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X70-20B 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 ACEJ12X70-20B (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 → ACEJ12X70-20B
- 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 ACPJ12X70-20B
The ACPJ12X70-20B is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 70 mm stroke by up to 20 mm, giving a usable range of 50-70 mm on site. The 12 mm bore 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 70 mm stroke exceeds the 50 mm standard maximum for this bore, so it is a made-to-order build. This model is discontinued; the current-production replacement is the ACEJ12X70 in the same bore, stroke and force class.
Practical sizing: plan on roughly 34 N of real work at 0.5 MPa (about 60% of the rated push), which lifts about 2.9 kg vertically with a 2:1 margin. The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim jigs and guards. The B code gives a male 6 mm rod with M3x0.5 external thread, the air port is M5x0.8, and a fixed TPU bumper sits at both ends. Note there is no magnet fitted (the -S code is optional); without it no CMSE / DMSE switch can be mounted. Confirm ISO 21287 mounting dimensions before swapping to the ACEJ12X70.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-20B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-20B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X70-20B |
| 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 ACEJ12X70-20B (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 ACPJ12X70-20B
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×70 | 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 ACPJ12X70-20B Is Used
PCB test fixture ejection
Ejects populated circuit boards from a nest in an in-circuit test rig, where the 50-70 mm adjustable range matches varying board thicknesses and 56.5 N is ample for a 150 g board.
Vial push-off on a lab line
Pushes finished 10 mL vials off a narrow conveyor lane in a pharmaceutical packing cell; the short body fits inside the guard channel beside the belt.
Small gate latch actuation
Latches a sliding access gate on a compact packaging machine, using the male M3x0.5 rod thread to bolt a knuckle straight to the swinging arm.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-20B with the ACEJ12X70-20B
Bore 12 is the smallest in the family; if 56.5 N push at 0.5 MPa is marginal, step up to bore 16 (100.5 N push) or bore 20 (157.1 N push) in the same compact body style. The stop screw only shortens the extend stroke within the ordered 20 mm window - it is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. Mount with FA/FB flange or LB foot; add the optional -S code if you need CMSE / DMSE switch positions. Order the ACEJ12X70 as the drop-in successor and verify the ISO 21287 mounting dimensions first.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X70-20B
- ✓ 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 ACPJ12X70-20B 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 is 11.5 kgf at 1.0 MPa. It is double acting with a 12 mm bore, 70 mm stroke (made to order, above the 50 mm standard max) and a 20 mm adjustment window (usable 50-70 mm). Operating pressure is 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, port M5x0.8, rod 6 mm male with M3x0.5 thread.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. The ACPJ family is discontinued; the ACEJ12X70 is the current drop-in in the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X70-20B
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X70-20B replacement — usually within 7-8 hours.