This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ20X120-20, 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 ACPJ20X120-20
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ20X120-20 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 ACEJ20X120-20 (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 → ACEJ20X120-20
- 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 ACPJ20X120-20
The ACPJ20X120-20 is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 120 mm stroke by up to 20 mm on site, giving a usable range of 100-120 mm. The 120 mm stroke is beyond the 100 mm standard limit for the 20 mm bore, so this unit is made to order.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into compact gantries and guarding where a full-length body cannot. A fixed TPU bumper sits at both ends, and the hard-anodized aluminium body carries an S45C hard-chrome rod. Note that the adjuster is a mechanical end stop only - on air loss the piston still drifts, so it never holds a load. This model is discontinued; the current-production replacement is ACEJ20X120, and buyers should confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-20 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-20 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ20X120-20 |
| 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 ACEJ20X120-20 (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 (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 ACPJ20X120-20
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 20 | 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 ACPJ20X120-20 Is Used
Pick-and-place lid lift
A 9.6 kg vertical-lift margin at 0.5 MPa suits raising plastic injection-mould covers on a compact press cell, with the 20 mm window trimming the stroke to the exact opening height.
Small-part ejection on assembly jigs
Pushing 157.1 N at 0.5 MPa ejects stamped terminals or connector housings off a jig, and the stop screw lets technicians dial the eject travel between 100 and 120 mm without changing cylinders.
Short-stroke divert on packaging lines
Mounted on an LB foot beside a narrow conveyor lane, the short body pushes cartons into a reject chute where a full-length profile cylinder would not fit the guarding.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ20X120-20 with the ACEJ20X120-20
Match FA/FB flange or LB foot mounts to your fixture, and remember the magnet is the optional -S code - without it no CMSE / DMSE switch can be fitted. The 120 mm stroke is a made-to-order length for this bore. Since ACPJ is discontinued, order the ACEJ20X120 as the direct successor and verify the ISO 21287 mounting footprint first.
Replacement checklist
- ✓ Current-production ACE → ACEJ20X120-20
- ✓ 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 ACPJ20X120-20 FAQ
Push is 157.1 N and pull 117.8 N at 0.5 MPa; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. It runs on air filtered to 40 um at 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. The rod is 10 mm with a female M6x1.0 thread, the port is M5x0.8 PT, and the 120 mm stroke is a made-to-order length above the 100 mm standard for this bore.
The -20 code sets a 20 mm adjustment window: an external stop screw shortens the extend stroke anywhere between 100 and 120 mm, though it cannot lengthen it past the ordered stroke. The stop is a mechanical end position only, not a mid-stroke lock, so the piston drifts if air is lost. This ACPJ model is discontinued; the current-production direct is ACEJ20X120 in the same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping, since the ACP is DIN-standard.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ20X120-20
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ20X120-20 replacement — usually within 7-8 hours.