This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X70-40B, 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 ACPJ12X70-40B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X70-40B 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 ACEJ12X70-40B (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 → ACEJ12X70-40B
- 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 ACPJ12X70-40B
Double acting and adjustable, the ACPJ12X70-40B is a discontinued DIN-standard compact cylinder with a 12 mm bore and a 70 mm stroke. Its hard-anodized aluminium body is roughly 50% shorter in mounting length than an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body cannot. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N push at 0.7 MPa, with a theoretical ceiling of 11.5 kgf at 1.0 MPa.
The -40 code sets a 40 mm adjustment window: a stop screw trims the extend stroke anywhere between 30 and 70 mm on site, so one cylinder covers several fixture positions. The 70 mm stroke exceeds the 50 mm standard limit for bore 12, so it is made to order. Because only about 0.6 of the rated push is usable in practice, plan on roughly 34 N of real work at 0.5 MPa, which lifts about 3 kg vertically with a 2:1 margin. The rod carries a male thread (B code) and the ports are M5x0.8. Replacement: order ACEJ12X70, the current ISO 21287 drop-in, and confirm mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X70-40B |
| 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 ACEJ12X70-40B (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 ACPJ12X70-40B
| 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 ACPJ12X70-40B Is Used
Indexing micro-stations
The 30-70 mm adjustable extend range lets one made-to-order cylinder serve several stop positions on a small assembly dial or indexing fixture without changing parts.
Compact jig clamping
With about 34 N of practical push at 0.5 MPa, the 12 mm bore suits light clamping of small brackets, terminals or PCB fixtures inside cramped jig plates.
Eject and sort heads
A 6 mm male-thread rod drives small ejector pins or sort fingers on packaging and electronics lines, with CMSE / DMSE switches available when the -S magnet is ordered.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X70-40B with the ACEJ12X70-40B
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 or the 20 mm bore for 157.1 N at the same pressure if the load is heavier. The stop screw is a mechanical end stop for the extend stroke only, not a mid-stroke lock, so the piston still drifts if air is lost. No magnet is fitted on this version; order the -S code if you need CMSE / DMSE switch sensing. FA/FB flange and LB foot mounts bolt to the standard face. This model is discontinued - ACEJ12X70 is the current-production equivalent in the same bore, stroke and force class.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X70-40B
- ✓ 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 ACPJ12X70-40B FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push is 79.2 N and pull 59.4 N. Theoretical maximum is 11.5 kgf at 1.0 MPa. In practice plan on about 0.6 of the push rating, roughly 34 N, which lifts about 3 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed 30-500 mm/s.
The -40 code gives a 40 mm window: a stop screw shortens the 70 mm extend stroke to any length from 30 mm upward, and a fixed TPU bumper decelerates at each end. The 70 mm stroke is non-standard for bore 12 (standard max is 50 mm), so it is made to order. This model is discontinued; ACEJ12X70 is the current ISO 21287 replacement - confirm mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X70-40B
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X70-40B replacement — usually within 7-8 hours.