This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-20, 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 ACPJ12X125-20
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-20 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 ACEJ12X125-20 (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 → ACEJ12X125-20
- 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 ACPJ12X125-20
Double acting and adjustable in stroke, the ACPJ12X125-20 is a DIN-standard compact cylinder with a 12 mm bore and a 125 mm stroke that a stop screw can trim by up to 20 mm, giving a usable extend range of 105-125 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those rise to 79.2 N and 59.4 N, with a theoretical peak of 11.5 kgf at 1.0 MPa. The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures and guarding where a full-length body will not fit.
Plan on roughly 34 N of real work at 0.5 MPa (about 0.6 of the 56.5 N rating), which corresponds to lifting about 2.9 kg vertically with a 2:1 margin. The 125 mm stroke exceeds the 50 mm maximum standard stroke for a 12 mm bore, so this unit is made to order. Note the ACPJ family is discontinued: the current-production drop-in is the ACEJ12X125, and buyers should confirm ISO 21287 mounting dimensions before swapping since the ACP is DIN-standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-20 |
| 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 ACEJ12X125-20 (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 ACPJ12X125-20
| 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 ACPJ12X125-20 Is Used
Small-part ejection from assembly fixtures
The 56.5 N push at 0.5 MPa (about 34 N of usable work) is enough to kick stamped terminals or molded clips off a nest, and the 105-125 mm adjustable range lets technicians dial the eject point without re-machining the fixture.
Sample pusher in a compact lab analyzer
With a body roughly 50% shorter than an ISO 15552 profile cylinder and an M5x0.8 port, this 12 mm bore slides into tight analyzer decks to advance sample trays one position per cycle at 30-500 mm/s.
Light vertical lift on a packaging line
Halving the 56.5 N thrust gives a vertical lift of about 2.9 kg with margin - suitable for raising a small gate or a lightweight sensor bracket on a cartoner, with the fixed TPU bumper softening both ends of travel.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20 with the ACEJ12X125-20
Size both ways: if 56.5 N push at 0.5 MPa is marginal, step up to the 16 mm bore for 100.5 N; if the load is lighter, the same 12 mm bore in a shorter standard stroke (up to 50 mm) costs less than this made-to-order 125 mm unit. The stop screw is a mechanical end stop for the extend stroke only - on air loss the piston can still drift, so it is not a load-holding brake. Rod end is a female M3x0.5 thread on a 6 mm rod, porting is M5x0.8, and FA/FB flange or LB foot mounts bolt to the ISO 21287 face. This model carries no magnet (no S code), so no CMSE or DMSE switch can be fitted; order an -S variant if sensing is needed. For new builds, specify the ACEJ12X125 instead.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-20
- ✓ 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 ACPJ12X125-20 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. The -20 code is a 20 mm adjustment window: a stop screw shortens the 125 mm extend stroke on site, so the usable range is 105-125 mm. It cannot lengthen the stroke past 125 mm, and the stop is not a mid-stroke lock - on air loss the piston drifts. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, with a fixed TPU bumper at both ends.
Yes, but it is a made-to-order stroke: the maximum standard stroke for a 12 mm bore is 50 mm, so 125 mm is built as a non-standard unit. Be aware the ACPJ family is discontinued. The current-production drop-in is the ACEJ12X125 (swap the P for an E), which matches the same bore, stroke and force class in the ISO 21287 family - confirm the ISO 21287 mounting dimensions against your DIN-standard ACP footprint before ordering. Also note this model has no magnet (the -S code is optional), so CMSE or DMSE switches cannot be mounted unless you order an S variant.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X125-20
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