This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X45-40S, 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 ACPJ12X45-40S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X45-40S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 45mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X45-40S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke45 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X45-40S
- 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 ACPJ12X45-40S
This compact cylinder works double acting: air drives the rod out and pulls it back, and a stop screw trims the extend stroke anywhere in the 5-45 mm window set by the -40 code. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N, rising to 79.2 N on the extend stroke at 0.7 MPa. 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 guarding where a full-length body cannot. Note that the stop is a mechanical end stop only - on air loss the piston still drifts, so it is not a load-holding lock.
The 12 mm bore delivers a theoretical 11.5 kgf at 1.0 MPa; as a working rule, plan on roughly 34 N (about 3.4 kgf) of real work at 0.5 MPa, which lifts around 1.7 kg vertically with a 2:1 margin. This unit carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be fitted for end-of-stroke sensing. The ACPJ family is discontinued: the current-production drop-in is the ACEJ12X45 in the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping, since the ACP was built to a DIN standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-40S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-40S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X45-40S |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-40S (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 ACPJ12X45-40S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACPJ12X45-40S Is Used
Micro jig clamping
The 56.5 N push at 0.5 MPa and a trimmable 5-45 mm extend stroke make this a fit for holding small aluminium brackets during drilling on compact machining fixtures.
Sensor-checked ejector
With the -S magnet fitted, CMSE or DMSE switches confirm rod position on a 45 mm eject stroke that pushes finished watch or connector parts off a nest.
Small-part press fit
About 34 N of practical working force at 0.5 MPa presses dowel pins or bushings into plastic housings on an electronics assembly bench.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-40S with the ACEJ12X45-40S
Size up or down from here: the 16 mm bore gives 100.5 N push at 0.5 MPa for heavier clamping, while this 12 mm bore at 56.5 N suits light fixtures and small part handling. If you need position sensing, keep the -S magnet code and pair it with CMSE or DMSE switches; FA/FB flange and LB foot mounts bolt to the standard face. Remember the adjuster only shortens the extend stroke - it never holds a load on air loss. For new builds, order the ACEJ12X45 instead, as this ACPJ model is discontinued.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X45-40S
- ✓ 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 ACPJ12X45-40S FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push rises to 79.2 N and pull to 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 40 mm adjustment window on the 45 mm stroke, runs on 0.15-1.0 MPa (22-145 psi) air filtered to 40 um at 30-500 mm/s, uses an M5x0.8 port and an M3x0.5 female rod thread, and carries the -S magnet for CMSE / DMSE switches. The model is discontinued; the ACEJ12X45 is the current replacement.
An external stop screw shortens the extend stroke anywhere within the ordered 40 mm window, giving a usable range of 5-45 mm; a fixed TPU bumper decelerates the rod at each end. The short-body build saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA/FB flange or LB foot mounts bolt straight to the face. For new designs, confirm ISO 21287 dimensions on the ACEJ12X45 replacement.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X45-40S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X45-40S replacement — usually within 7-8 hours.