This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-20S, 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 ACPJ12X125-20S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-20S 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 ACEJ12X125-20S (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 → ACEJ12X125-20S
- 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 ACPJ12X125-20S
This is a double acting, adjustable-stroke compact cylinder in the AirTAC ACPJ series, with a 12 mm bore and a 125 mm stroke. At 0.5 MPa it pushes with 56.5 N and pulls with 42.4 N, rising to 79.2 N and 59.4 N at 0.7 MPa. The -20 code sets a 20 mm adjustment window, so a stop screw trims the extend stroke anywhere in a 105-125 mm range on site. The 125 mm stroke is longer than the 50 mm maximum standard stroke for bore 12, so it is a made-to-order build. This model is discontinued; the current-production drop-in is ACEJ12X125, so confirm ISO 21287 mounting dimensions before swapping.
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 slim pick-and-place heads and compact fixtures. The -S code on this model means the magnet is fitted, so CMSE or DMSE reed and solid-state switches can be clamped on for end-of-stroke sensing. A fixed TPU bumper sits at each end to soften the stops, and the female M3x0.5 rod thread takes standard I/Y knuckles. As a rule of thumb, plan on about 34 N of usable push at 0.5 MPa, which lifts roughly 3 kg vertically with margin.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-20S |
| 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 ACEJ12X125-20S (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 ACPJ12X125-20S
| 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 ACPJ12X125-20S Is Used
Small-parts ejector on assembly fixtures
The 56.5 N push at 0.5 MPa clears a finished connector or sensor cap from a nest, and the 20 mm window lets you trim the 125 mm stroke down to 105 mm so the ejector pin stops exactly at part height.
Position-verified slide in a test station
Because the -S magnet is fitted, CMSE or DMSE switches clamp onto the 12 mm body to confirm the rod has reached the trimmed stop before the PLC releases the fixture.
Sample press in a lab dosing rig
About 34 N of usable push at 0.5 MPa seats vials or micro-well plates gently, and the short body fits inside a benchtop guard where a full-length profile cylinder would not.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-20S with the ACEJ12X125-20S
Size both ways: bore 16 delivers 100.5 N push at 0.5 MPa if 56.5 N is marginal, while staying at bore 12 keeps the envelope smallest. The 20 mm window shortens the extend stroke only; it never extends past 125 mm and it is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. Match FA/FB flange or LB foot mounts and I/Y rod knuckles to the ISO 21287 face. This ACPJ is discontinued - order ACEJ12X125 as the current replacement and verify the mounting dimensions against your fixture.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-20S
- ✓ 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 ACPJ12X125-20S 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 gives a 20 mm adjustment window: a stop screw shortens the 125 mm extend stroke anywhere down to 105 mm. It is a mechanical end stop only - on air loss the piston still drifts, so never rely on it to hold a load. Operating range is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, with a fixed TPU bumper at both ends.
No - the maximum standard stroke for bore 12 is 50 mm, so 125 mm is a made-to-order stroke. The ACPJ family is discontinued; the current-production drop-in is ACEJ12X125 (same bore, stroke and force class in the ISO 21287 ACE series). Before swapping, confirm the ISO 21287 mounting dimensions against your fixture, since the ACP was built to a DIN-standard footprint. The -S magnet on this model carries over as an option on the ACEJ, enabling CMSE / DMSE switches.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X125-20S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X125-20S replacement — usually within 7-8 hours.