This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ20X120-30, 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 ACPJ20X120-30
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ20X120-30 is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø20mm 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 ACEJ20X120-30 (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ20 mm
- Stroke120 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM6×1.0
- StatusDiscontinued → ACEJ20X120-30
- 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 ACPJ20X120-30
The ACPJ20X120-30 is a double acting compact cylinder with an adjustable extend stroke, discontinued by AirTAC and now superseded by the ISO 21287 ACEJ20X120. The 120 mm stroke is above the 100 mm standard limit for this bore, so it is a made-to-order build. A stop screw trims the extend stroke anywhere within the ordered 30 mm window, giving a usable range of 90-120 mm on site.
The hard-anodized aluminium body with an S45C hard-chrome rod keeps the short ISO 21287 footprint, which saves roughly 50% of the mounting length of an ISO 15552 profile cylinder - useful in tight jigs and gantries. Fixed TPU bumpers sit at both ends, speed spans 30-500 mm/s, and pressure runs 0.15-1.0 MPa (22-145 psi). Note this model carries no magnet, so position switches cannot be fitted unless the optional -S magnet version is ordered.
Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-30 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-30 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ20X120-30 |
| Bore size | Ø20 mm |
| Stroke | 120 mm |
| Acting type | Double acting, double rod, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| 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 100 mm |
Specifications follow the official AirTAC ACP datasheet (now discontinued). The ACEJ20X120-30 (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 (Ø20mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 118 N |
| 0.7 MPa | 165 N |
| Max (@1.0 MPa) | 24 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 ACPJ20X120-30
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 20 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -30 | 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 ACPJ20X120-30 Is Used
Packaging line ejector
Pushes misaligned cartons off a conveyor lane; the compact body fits the narrow guard space where a full-length profile cylinder would not.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-30 with the ACEJ20X120-30
The 30 mm window suits fixtures where the final extend position is tuned during commissioning, but remember the stop screw only shortens the stroke - it is not a mid-stroke lock, and the rod drifts if air is lost. Mounting uses the FA/FB flange or LB foot on the ISO 21287 face. If you need sensing, order the -S variant so CMSE / DMSE switches can ride the body. Since this model is discontinued, spec the ACEJ20X120 as the current direct and confirm the ISO 21287 mounting dimensions before swapping.
Replacement checklist
- ✓ Current-production ACE → ACEJ20X120-30
- ✓ 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 ACPJ20X120-30 FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N; theoretical maximum is 32 kgf at 1.0 MPa. The -30 code is a 30 mm adjustment window: a stop screw shortens the 120 mm extend stroke by up to 30 mm, so the working range is 90-120 mm. Speed is 30-500 mm/s and the port is M5x0.8. The 120 mm stroke is made to order since the bore's standard limit is 100 mm.
Order the ACEJ20X120, the current-production ISO 21287 successor: swap the P for an E and you get the same bore, stroke and force class in a matching short body. Before swapping, confirm the ISO 21287 mounting dimensions against your fixture, because the ACP family was built to the older DIN-standard layout. FA/FB flange and LB foot options carry over, and the optional -S magnet enables CMSE / DMSE switches on the new model.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ20X120-30
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ20X120-30 replacement — usually within 7-8 hours.