This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X25-20, 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 ACPJ12X25-20
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X25-20 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 ACEJ12X25-20 (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 → ACEJ12X25-20
- 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 ACPJ12X25-20
A double acting compact cylinder with an adjustable extend stroke, the ACPJ12X25-20 pairs a 12 mm bore with a 25 mm base stroke and a 20 mm adjustment window, so the stop screw trims the working stroke anywhere in a 5-25 mm range on site. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those figures rise to 79.2 N and 59.4 N, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. The short ISO 21287-class body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into slim fixtures and guarded assemblies.
In practice, plan on about 34 N (roughly 3.5 kg) of real pushing work at 0.5 MPa, and expect it to lift about 2.9 kg vertically once a 2:1 margin is applied. The hard-anodized aluminium body carries a 6 mm S45C hard-chrome rod with a female M3x0.5 thread, M5x0.8 ports, and fixed TPU bumpers at both ends. Note that this model is discontinued: the current-production drop-in is ACEJ12X25, and buyers should confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X25-20 |
| 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 ACEJ12X25-20 (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 ACPJ12X25-20
| 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 ACPJ12X25-20 Is Used
Small-part ejection from plastic molds
The trimmed 5-25 mm stroke and 56.5 N push at 0.5 MPa are enough to nudge finished caps or clips off a benchtop mold, and the short body fits where a full-length cylinder cannot.
Presence checking on electronics assembly lines
With the optional -S magnet and CMSE / DMSE switches, the 25 mm stroke confirms a connector or PCB is seated before the next station cycles.
Light clamping in test fixtures
About 34 N of usable force at 0.5 MPa holds small housings or wire harnesses against a stop during a bench test, with the 20 mm window tuned to the part height.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-20 with the ACEJ12X25-20
Size by force first: if 56.5 N of push at 0.5 MPa is marginal for your jig, step up to the 16 mm bore (100.5 N push) or the 20 mm bore (157.1 N push) in the same compact family; if the load is lighter, this 12 mm bore keeps the envelope smallest. The 20 mm window means the extend stroke can be set anywhere from 5 to 25 mm with the external stop, but remember the stop is a mechanical end stop only - on air loss the piston still drifts, so it is not a load-holding lock. Mounting is FA/FB flange or LB foot on the standard face; this version has no magnet, so position switches need the optional -S code to enable CMSE / DMSE sensors. This model is discontinued - order ACEJ12X25 as the current replacement and verify the ISO 21287 mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X25-20
- ✓ 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 ACPJ12X25-20 FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa it pushes 79.2 N and pulls 59.4 N; theoretical maximum is 11.5 kgf at 1.0 MPa. For real work, budget about 34 N (around 3.5 kg) of push at 0.5 MPa, and about 2.9 kg of vertical lift with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s.
The -20 code is a 20 mm adjustment window: an external stop screw shortens the 25 mm extend stroke on site, giving a usable range of 5-25 mm. It cannot lengthen the stroke past 25 mm, and the stop is not a mid-stroke lock. Fixed TPU bumpers decelerate at both ends. This model is discontinued; the current-production replacement is ACEJ12X25 (same bore, stroke and force class) - confirm the ISO 21287 mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X25-20
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X25-20 replacement — usually within 7-8 hours.