This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-20SB, 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 ACPJ12X125-20SB
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-20SB is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 125mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X125-20SB (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke125 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X125-20SB
- 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 ACPJ12X125-20SB
The ACPJ12X125-20SB is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 125 mm stroke by up to 20 mm on site, giving a usable range of 105-125 mm. This 12 mm bore unit delivers 56.5 N push and 42.4 N pull at 0.5 MPa (rising to 79.2 N at 0.7 MPa), with a male rod thread (B code) and the -S magnet already fitted so CMSE / DMSE switches can be mounted for end-of-stroke signalling. The 125 mm stroke exceeds the 50 mm maximum standard stroke for bore 12, so it is a non-standard, made-to-order build.
Its hard-anodized aluminium short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs and guarded stations. As a rule of thumb, plan on roughly 34 N (about 3.5 kg) of real work at 0.5 MPa, or lift about 2.9 kg vertically with a 2:1 margin. Note that the ACPJ family is discontinued: the current-production drop-in is the ACEJ12X125 in the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping, since ACP is DIN-standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20SB Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20SB |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-20SB |
| Bore size | Ø12 mm |
| Stroke | 125 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 ACEJ12X125-20SB (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 ACPJ12X125-20SB
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×125 | 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 ACPJ12X125-20SB Is Used
Small-part ejector on assembly jigs
The 56.5 N push at 0.5 MPa clears light aluminium or plastic parts from nests, and the 20 mm adjustment window lets technicians fine-tune the eject position between 105 and 125 mm without swapping cylinders.
Position-flagged slide in a test station
With the -S magnet fitted, CMSE or DMSE switches signal the trimmed extend position, so a 105-125 mm verified press or present stroke can be interlocked into the PLC sequence.
Low-force clamp inside a guarded module
A short body about 50% more compact than an ISO 15552 profile cylinder fits inside slim guarding, applying about 34 N of practical clamping force at 0.5 MPa on small brackets or PCB fixtures.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20SB with the ACEJ12X125-20SB
Size both ways: if 56.5 N push at 0.5 MPa is marginal for your fixture, step up to bore 16 (100.5 N push at 0.5 MPa); if the load is under about 34 N, bore 12 is already the smallest in the range. The mechanical stop only shortens the extend stroke within the 20 mm window - it is not a mid-stroke lock, so on air loss the piston still drifts and an external brake is needed to hold a load. Mounting uses FA/FB flange or LB foot on the ISO 21287 face, and the fitted -S magnet pairs with CMSE / DMSE switches. For new projects, order the ACEJ12X125 instead, as this ACPJ model is discontinued.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-20SB
- ✓ 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 ACPJ12X125-20SB FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa push is 79.2 N and pull 59.4 N; theoretical maximum is 11.5 kgf at 1.0 MPa. The -20 code gives a 20 mm adjustment window, so the 125 mm extend stroke can be trimmed anywhere in a 105-125 mm range with the stop screw. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, port M5x0.8, rod 6 mm with male thread, and the 125 mm stroke is a made-to-order length above the 50 mm standard maximum for bore 12.
The ACPJ family is no longer in production. The current-production replacement is the ACEJ12X125 (swap the P for an E), an ISO 21287 compact cylinder in the same bore, stroke and force class with the same FA/FB flange and LB foot mounting family. Because the ACP is DIN-standard, confirm the ISO 21287 mounting dimensions against your fixture before swapping. If you need position sensing on the replacement, order the -S magnet code so CMSE / DMSE switches can be used.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X125-20SB
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