This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X120-50S, 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 ACPJ12X120-50S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X120-50S 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 ACEJ12X120-50S (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 → ACEJ12X120-50S
- 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 ACPJ12X120-50S
This ACPJ12X120-50S is a double acting, adjustable-stroke compact cylinder in the DIN-standard ACP family, now discontinued. The 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical peak of 11.5 kgf at 1.0 MPa. The -50 code gives a 50 mm adjustment window, so a stop screw trims the extend stroke anywhere in a 70-120 mm range on site. Note the 120 mm stroke exceeds the 50 mm standard maximum for this bore, so it is a made-to-order build.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits cramped jigs and guarding. As the S code is fitted here, the optional -S magnet is on board and CMSE or DMSE reed or solid-state switches can be mounted directly. In practice, plan on roughly 34 N of usable push at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. The current-production drop-in is the ACEJ12X120; confirm ISO 21287 mounting dimensions before swapping, since the ACP is DIN-standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-50S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-50S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X120-50S |
| 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 ACEJ12X120-50S (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 ACPJ12X120-50S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×120 | Stroke length in mm. |
| -50 | 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 ACPJ12X120-50S Is Used
Bench-top dial gauge fixture
The 70-120 mm adjustable range lets a technician trim the extend stroke to seat small aluminium housings under a dial indicator without changing hardware.
Presence check on an electronics assembly line
With the fitted -S magnet and a CMSE switch, the controller confirms the 12 mm bore reached the trimmed end position before a solder pallet advances.
Lab sample press
About 2.9 kg of vertical lift capacity at a 2:1 margin suits pressing microscope slide lids or capping small vials at 0.5 MPa.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-50S with the ACEJ12X120-50S
At 12 mm bore you get 56.5 N push at 0.5 MPa; step up to the 16 mm bore for 100.5 N or drop to the smallest size only if your load is under about 34 N of real work. The 50 mm window means the machine can be tuned between 70 mm and 120 mm extend stroke without re-plumbing. The adjuster is a mechanical end stop for the extend stroke, not a mid-stroke lock, so the piston still drifts if air is lost. FA/FB flange and LB foot mountings bolt to the standard face, and this S-coded unit carries the optional magnet for CMSE / DMSE switches. For new designs, order the ACEJ12X120 instead.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X120-50S
- ✓ 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 ACPJ12X120-50S 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, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -50 code sets a 50 mm adjustment window: an external stop screw shortens the 120 mm extend stroke by up to 50 mm, giving a usable 70-120 mm range. The stop is an end stop only, not a load-holding brake. The 120 mm stroke is made to order, since the bore 12 standard maximum is 50 mm.
No, the ACPJ family is discontinued. The current-production drop-in is the ACEJ12X120, which matches the same bore, stroke and force class. Because the ACP is DIN-standard rather than ISO 21287, confirm the mounting dimensions before swapping. This unit has the optional -S magnet fitted, so CMSE / DMSE switches work; a replacement ordered without the S code carries no magnet. Both ends carry a fixed TPU bumper, and speed is 30-500 mm/s over 0.15-1.0 MPa (22-145 psi).
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X120-50S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X120-50S replacement — usually within 7-8 hours.