This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-10B, 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 ACPJ12X125-10B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-10B 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 ACEJ12X125-10B (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 → ACEJ12X125-10B
- 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 ACPJ12X125-10B
This is a double acting compact cylinder with an adjustable extend stroke, built on the DIN-standard ACP short body: a hard-anodized aluminium barrel with threaded aluminium covers, an S45C hard-chrome piston rod and a fixed TPU bumper at each end. The 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa (79.2 N / 59.4 N at 0.7 MPa), running at 30-500 mm/s on 0.15-1.0 MPa (22-145 psi) filtered air. The 125 mm stroke is longer than the 50 mm maximum standard stroke for this bore, so it is a made-to-order build.
The -10 code adds a 10 mm adjustment window: an external stop screw trims the extend stroke anywhere within 115-125 mm, so one cylinder can be tuned to several fixture positions on site. The short ISO 21287-class body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits slim slides and guarded stations. As a rule of thumb, plan on about 34 N (roughly 3 kg of vertical lift with a 2:1 margin) of usable work at 0.5 MPa rather than the full rating. Note the stop is a mechanical end stop, not a mid-stroke lock: on air loss the piston still drifts. This model is discontinued; the current-production drop-in is the ACEJ12X125, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-10B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-10B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-10B |
| 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 ACEJ12X125-10B (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 ACPJ12X125-10B
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -10 | 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 ACPJ12X125-10B Is Used
Small-parts ejection in plastic molding
The 56.5 N push at 0.5 MPa is enough to kick light molded clips or bushings off a fixture, and the 10 mm trim window lets operators fine-tune the eject position without shimming.
Compact test-and-sort stations
With a body about 50% shorter than an ISO 15552 profile cylinder, the 12 mm bore slides into guarded electronics sorters where space above the part is minimal; add the -S magnet code on the replacement for CMSE / DMSE switching.
Light clamping on PCB test rigs
About 3 kg of vertical lift capacity with a 2:1 margin at 0.5 MPa holds thin circuit boards or small housings down during probing, with the male rod thread simplifying knuckle attachment.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-10B with the ACEJ12X125-10B
At 12 mm bore you are at the light end of the range: 56.5 N push at 0.5 MPa. If your jig needs more, step up to the 16 mm bore (100.5 N push at 0.5 MPa) or the 20 mm bore (157.1 N). The B code gives a male 6 mm rod thread; the port is M5x0.8. FA/FB flange and LB foot mounts bolt to the standard face, and I/Y rod knuckles are available. Position sensing requires the optional -S magnet code for CMSE / DMSE switches - this model has no S code, so no magnet is fitted and no switch can be mounted. Since ACPJ is discontinued, order the ACEJ12X125 as the current replacement and verify the ISO 21287 mounting footprint first.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-10B
- ✓ 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 ACPJ12X125-10B FAQ
At 0.5 MPa the 12 mm bore gives 56.5 N push and 42.4 N pull; at 0.7 MPa it gives 79.2 N push and 59.4 N pull, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -10 code provides a 10 mm adjustment window, so the 125 mm extend stroke can be trimmed anywhere in a 115-125 mm range via the external stop screw. The 125 mm stroke is a made-to-order length because the bore's standard maximum is 50 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
It uses a hard-anodized aluminium body with threaded aluminium covers, an S45C hard-chrome rod, a fixed TPU bumper at both ends and an M5x0.8 port. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA/FB flange plus LB foot mounts bolt to the standard face. The ACPJ family is no longer in production: the current drop-in is the ACEJ12X125 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.
Related AirTAC ACE Cylinders
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