This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X25-30S, 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 ACPJ12X25-30S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X25-30S 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 ACEJ12X25-30S (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 → ACEJ12X25-30S
- 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 ACPJ12X25-30S
The ACPJ12X25-30S is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 25 mm stroke within a 30 mm window, giving a usable range of 0-25 mm on site. This 12 mm bore size delivers 56.5 N push and 42.4 N pull at 0.5 MPa (rising to 79.2 N at 0.7 MPa), which works out to roughly 3.4 kg of vertical lift at 0.5 MPa - about 2 kg with a 2:1 margin, enough for small fixture clamps and light part ejection.
Its hard-anodized aluminium body is an ISO 21287 short build that saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into cramped jig plates and guarding where a full-length body cannot. A fixed TPU bumper sits at both ends, the S code means the magnet is fitted so CMSE / DMSE reed or solid-state switches can be mounted, and the rod ends in a female M3x0.5 thread. Note: this model is discontinued - the current-production replacement is the ACEJ12X25, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-30S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-30S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X25-30S |
| 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 ACEJ12X25-30S (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 ACPJ12X25-30S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| -30 | 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 ACPJ12X25-30S Is Used
Small jig clamp on a drill fixture
The 56.5 N push at 0.5 MPa clamps light aluminium brackets in a drilling jig, while the 30 mm window lets the operator trim the extend stroke to match part thickness without shimming.
Position-verified slide in an electronics assembly cell
With the fitted magnet and a CMSE switch at each end, a 12 mm bore slide confirms home and end positions on a PCB tray indexing station running at 30-500 mm/s.
Light part ejection from a plastic molding tray
About 3 kg of vertical push capacity at 0.5 MPa nudges finished caps off a pick-up nest, and the short ISO 21287 body fits inside the tray conveyor frame.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X25-30S with the ACEJ12X25-30S
For this 12 mm bore, plan on about 34 N of real work at 0.5 MPa (roughly 60% of the 56.5 N push rating) rather than the full figure. If your load needs more, the 16 mm bore gives 100.5 N push at 0.5 MPa and the 20 mm bore reaches 157.1 N; if less, a smaller stroke window or the fixed-stroke ACP may suit. The adjuster is a mechanical end stop for the extend stroke only - it does not lock the piston mid-stroke, so on air loss the rod can still drift. The fitted -S magnet pairs with CMSE / DMSE switches, and FA flange or LB foot mounts bolt to the ISO 21287 face. Order the ACEJ12X25 as the current drop-in replacement.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X25-30S
- ✓ 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 ACPJ12X25-30S FAQ
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 and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 25 mm stroke adjustable within a 30 mm window, runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, and ports at M5x0.8.
An external stop screw shortens the extend stroke anywhere within the ordered 30 mm window, so the effective range is 0-25 mm; it cannot lengthen the stroke past 25 mm, and it is an end stop rather than a mid-stroke lock. The ACPJ family is discontinued - order the ACEJ12X25, the ISO 21287 successor in the same bore, stroke and force class, and confirm its mounting dimensions against your fixture first.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X25-30S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X25-30S replacement — usually within 7-8 hours.