This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-50, 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 ACPJ12X125-50
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-50 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 ACEJ12X125-50 (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 → ACEJ12X125-50
- 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 ACPJ12X125-50
This is a double acting compact cylinder with an adjustable extend stroke: bore 12 mm, stroke 125 mm, and a 50 mm adjustment window set by the -50 code. A stop screw trims the extend stroke anywhere in the 75-125 mm range on site, so one cylinder covers several jig positions. Push force is 56.5 N and pull 42.4 N at 0.5 MPa, rising to 79.2 N at 0.7 MPa, with a theoretical maximum of 11.5 kgf at 1.0 MPa. Note the 125 mm stroke is longer than the 50 mm standard maximum for this bore, so it is a made-to-order build.
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 tight fixtures and guarding where a full-length body will not fit. In practice, plan for about 34 N of usable push at 0.5 MPa, which lifts roughly 2.9 kg vertically with a 2:1 margin. A fixed TPU bumper sits at both ends, the hard-anodized aluminium body carries an S45C hard-chrome rod, and the rod end is female M3x0.5. No magnet is fitted on this version; the optional -S code adds one for CMSE / DMSE switches. This model is discontinued - the current drop-in is ACEJ12X125, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-50 |
| 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 ACEJ12X125-50 (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 ACPJ12X125-50
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -50 | 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 ACPJ12X125-50 Is Used
Small-part press fitting
Pressing dowel pins or bushings into plastic housings on an electronics assembly bench, where the 75-125 mm adjustable range lets one cylinder serve several fixture depths and 56.5 N at 0.5 MPa suits light interference fits.
Pick-and-place gating
Extending a gate or stopper on a compact conveyor divert station, where the short body fits under guarding and the made-to-order 125 mm stroke reaches across a narrow product lane.
Lab dispenser actuation
Driving a small syringe or valve plunger in a laboratory dosing unit, where the female M3x0.5 rod thread takes a custom knuckle and about 2.9 kg of vertical lift covers a light dosing head.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50 with the ACEJ12X125-50
Size both ways: if 56.5 N of push at 0.5 MPa is more than your load needs, the same family in a smaller format will not go lower than this 12 mm bore, so check whether a shorter stroke or lower pressure suits instead; if you need more force, step up to the 16 mm bore for 100.5 N push or the 20 mm bore for 157.1 N at 0.5 MPa. The stop screw is a mechanical end stop only - on air loss the piston still drifts, so it is not a load-holding lock. FA/FB flange and LB foot mountings bolt to the standard face, and ordering the -S code enables CMSE / DMSE switch positions. For new projects, specify the current-production ACEJ12X125 instead and verify the ISO 21287 mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-50
- ✓ 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 ACPJ12X125-50 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. Operating pressure is 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, fluid air filtered to 40 um. Port is M5x0.8, rod thread female M3x0.5, and the 125 mm stroke is a made-to-order length above the 50 mm standard maximum for this bore.
The -50 code sets a 50 mm window: an external stop screw shortens the extend stroke anywhere between 75 and 125 mm, so you can dial in the exact reach on the machine without changing cylinders. The stop is a mechanical end stop, not a mid-stroke lock, so the rod can still drift if air is lost. The ACPJ family is discontinued; the current-production replacement is ACEJ12X125, a drop-in in the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping.
Related AirTAC ACE Cylinders
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