This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X40-40B, 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 ACPJ12X40-40B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X40-40B 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 ACEJ12X40-40B (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 → ACEJ12X40-40B
- 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 ACPJ12X40-40B
Double acting and adjustable in stroke, the ACPJ12X40-40B is a discontinued DIN-standard compact cylinder with a 12 mm bore and 40 mm stroke. 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. A stop screw trims the extend stroke anywhere within the ordered 40 mm window, giving a usable range of 0-40 mm on site. Its short ISO 21287-class body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures a full-length body cannot reach.
The male rod thread (B code) ends in a 6 mm rod, and air ports are M5x0.8. A fixed TPU bumper sits at both ends to soften end-of-travel contact only - it never holds or brakes a load, and on air loss the piston still drifts. Plan on about 34 N of real work at 0.5 MPa (roughly 60% of the push rating), which corresponds to lifting about 3 kg vertically with a 2:1 margin. This model is discontinued; the current-production drop-in is the ACEJ12X40, so confirm ISO 21287 mounting dimensions before swapping. The optional -S code adds the magnet for CMSE / DMSE switches - without it no sensor can be fitted.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-40B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-40B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X40-40B |
| 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 ACEJ12X40-40B (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 ACPJ12X40-40B
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | 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 ACPJ12X40-40B Is Used
Micro part ejection
The 0-40 mm adjustable extend stroke and 56.5 N push at 0.5 MPa suit nudging small machined or moulded parts off a nest on an automated bench.
Presence check fixtures
With the optional -S magnet and CMSE / DMSE switches, the trimmed stroke acts as a go/no-go probe for connector or PCB presence in test rigs.
Light clamping on SMT lines
About 34 N of usable force at 0.5 MPa holds small housings during a screwdriving or labelling step where a full-size cylinder will not fit.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-40B with the ACEJ12X40-40B
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). If 56.5 N is generous for the job, remember the 40 mm stop screw lets you dial the extend stroke down to almost zero, which is ideal for ejection or present/verify tasks with variable part heights. Mounting is via FA/FB flange or LB foot on the ISO 21287 face, and the B code gives a male rod thread for direct knuckle attachment. Since the ACPJ12X40-40B is discontinued, order the ACEJ12X40 as the current replacement and verify mounting dimensions against ISO 21287 before the swap.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X40-40B
- ✓ 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 ACPJ12X40-40B FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push is 79.2 N and pull 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 12 mm bore, 40 mm stroke trimmed by a 40 mm stop-screw window, M5x0.8 ports, male rod thread on a 6 mm rod, speed 30-500 mm/s, pressure 0.15-1.0 MPa (22-145 psi) and a fixed TPU bumper at each end.
Order the ACEJ12X40, the current-production ISO 21287 successor: swap the P for an E and you get the same bore, stroke and force class in a matching short body. Because the ACP is DIN-standard, confirm the ISO 21287 mounting dimensions before swapping. Also note the magnet is not fitted on this unit - only the -S code version accepts CMSE / DMSE switches.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X40-40B
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X40-40B replacement — usually within 7-8 hours.