This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X25-20S, 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 ACPJ12X25-20S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X25-20S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 25mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X25-20S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke25 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X25-20S
- 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 ACPJ12X25-20S
Double acting and adjustable, the ACPJ12X25-20S is a discontinued DIN-standard compact cylinder with a 12 mm bore and a 25 mm stroke trimmed by a 20 mm stop window, so the extend stroke can be set anywhere from 5 to 25 mm on site. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N push, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. The hard-anodized aluminium body with an S45C hard-chrome rod keeps the mounting length about 50% shorter than an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body cannot.
Because the -S code is in this model, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be mounted for end-of-stroke signalling. The stop screw is a mechanical end stop for the extend stroke only - it shortens travel, never lengthens it, and on air loss the piston still drifts, so it is not a load lock. In practice, plan on roughly 34 N (about 60% of the 56.5 N rating) of real work at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. This model is discontinued; the current-production drop-in is the ISO 21287 ACEJ12X25 - confirm mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X25-20S |
| Bore size | Ø12 mm |
| Stroke | 25 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 ACEJ12X25-20S (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 ACPJ12X25-20S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×25 | 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 ACPJ12X25-20S Is Used
Small-part ejection from plastic molds
The 5-25 mm trimmed stroke and 56.5 N push at 0.5 MPa are enough to kick light molded clips or bushings off a bench-top fixture, with the fitted magnet confirming eject position via a CMSE switch.
Sample press in a lab automation station
About 34 N of usable force at 0.5 MPa seats microplate lids or vial caps without crushing, and the 12 mm bore keeps the whole station footprint minimal.
Carton flap hold-down on a packing bench
The short body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, letting the clamp sit inside a tight guard while the 42.4 N pull retracts the pad clear of the box.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20S with the ACEJ12X25-20S
At 12 mm bore this is the smallest ACPJ size: 56.5 N push at 0.5 MPa. Step up to the 16 mm bore for 100.5 N push at the same pressure, or down is not possible - 12 mm is the floor of the range. The 25 mm stroke sits inside the 50 mm max standard stroke for this bore, so no made-to-order stroke is needed. The female M3x0.5 rod thread takes I or Y knuckles; FA flange or LB foot mountings bolt to the ISO 21287 face. If you need position sensing, this unit already carries the optional -S magnet for CMSE / DMSE switches. For new designs, order the ACEJ12X25 instead - this ACPJ is discontinued.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X25-20S
- ✓ 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 ACPJ12X25-20S 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. The -20 code gives a 20 mm adjustment window on the 25 mm stroke, so the extend stroke is settable from 5 to 25 mm with the stop screw. It is double acting, runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-500 mm/s, with a fixed TPU bumper at both ends.
Yes - the S in the code means the optional -S magnet is fitted on this unit, so CMSE / DMSE reed or solid-state switches can be mounted for position feedback. The ACPJ family is no longer in production: the current drop-in is the ISO 21287 ACEJ12X25, which matches the same bore, stroke and force class. Because the ACP is DIN-standard, confirm the ISO 21287 mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X25-20S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X25-20S replacement — usually within 7-8 hours.