This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X120-20S, 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 ACPJ12X120-20S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X120-20S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 120mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X120-20S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke120 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X120-20S
- 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 ACPJ12X120-20S
Double acting and adjustable, the discontinued ACPJ12X120-20S runs air to both faces of its 12 mm piston, so the rod extends and retracts under power. A stop screw trims the extend stroke anywhere within the ordered 20 mm window, giving a usable range of 100-120 mm on this made-to-order stroke. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N and 59.4 N, with a theoretical ceiling of 11.5 kgf at 1.0 MPa. As a rule of thumb, plan on roughly 34 N of real work (about 0.6 of the push figure), which is around 3 kg of vertical lift with a 2:1 margin.
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 guard rails. 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 signals. A fixed TPU bumper sits at each end, the hard-anodized aluminium body carries an S45C hard-chrome rod, and the female M3x0.5 rod thread plus M5x0.8 ports keep plumbing simple. This model is discontinued: the current-production replacement is ACEJ12X120, and you should confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-20S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-20S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X120-20S |
| Bore size | Ø12 mm |
| Stroke | 120 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 ACEJ12X120-20S (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 ACPJ12X120-20S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×120 | 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 ACPJ12X120-20S Is Used
Small-part ejection
Ejects finished watch or connector components from a fixture with 56.5 N of push at 0.5 MPa, trimmed to a 100-120 mm extend range by the 20 mm stop window.
Gated inspection station
With the -S magnet fitted, CMSE or DMSE switches confirm the rod position of this 120 mm stroke inside a vision-check enclosure where space is tight.
Label press hold-down
Holds thin film stock flat on a labelling head; the 3 kg vertical-lift equivalent covers light hold-down duty at 30-500 mm/s cycle speeds.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-20S with the ACEJ12X120-20S
At 12 mm bore this is the smallest ACPJ size: 56.5 N push at 0.5 MPa suits light clamping, ejecting and sorting of small parts. Step up to the 16 mm bore for 100.5 N push or the 20 mm bore for 157.1 N at the same pressure if the load is heavier. The 120 mm stroke is non-standard for this bore (50 mm is the standard maximum), so it is made to order. The 20 mm window only shortens the extend stroke; it is a mechanical stop, not a mid-stroke lock, so the piston still drifts if air is lost. FA/FB flange and LB foot mountings bolt to the ISO 21287 face. Since this unit is discontinued, order ACEJ12X120 as the drop-in successor and verify the mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X120-20S
- ✓ 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 ACPJ12X120-20S 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. The theoretical maximum is 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating, on air filtered to 40 um, running 30-500 mm/s.
The -20 code sets a 20 mm adjustment window: an external stop screw shortens the extend stroke on site, so the usable range is 100-120 mm. The stop is a mechanical end stop only, not a load-holding brake. The ACPJ family is discontinued; the current-production drop-in is ACEJ12X120, so confirm ISO 21287 mounting dimensions before ordering.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X120-20S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X120-20S replacement — usually within 7-8 hours.