This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X50-20B, 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 ACPJ12X50-20B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X50-20B is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 50mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X50-20B (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke50 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X50-20B
- 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 ACPJ12X50-20B
This discontinued ACPJ12X50-20B is a double acting compact cylinder with a 12 mm bore and 50 mm stroke, and its -20 code adds a 20 mm adjustment window: a stop screw trims the extend stroke on site anywhere from 30 mm to 50 mm. Air pressure drives the rod out at 56.5 N and pulls it back at 42.4 N at 0.5 MPa, rising to 79.2 N on the extend side at 0.7 MPa. Its short ISO 21287-class body saves roughly 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures a full-length body cannot reach.
For sizing, plan on about 34 N of real work at 0.5 MPa (roughly 60% of the rated push), which corresponds to lifting about 3 kg vertically - halve that to around 1.7 kg if you want a 2:1 margin on a pick-and-place part. The male rod thread (B code) bolts directly to your tooling, the fixed TPU bumper decelerates at both ends, and the optional -S magnet enables CMSE / DMSE switches. Note this model is no longer produced: the current drop-in is the ACEJ12X50, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X50-20B |
| Bore size | Ø12 mm |
| Stroke | 50 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 ACEJ12X50-20B (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 ACPJ12X50-20B
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | 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 ACPJ12X50-20B Is Used
Micro part ejection from jigs
The 56.5 N push at 0.5 MPa is enough to strip small plastic or stamped parts off a locating pin, and the 30-50 mm adjustable window lets one cylinder serve several jig variants.
Compact gate latch on a small enclosure
With the short body tucked behind a guard panel, the male rod thread drives a latch arm; add the -S magnet and a DMSE switch to confirm the gate is closed.
Sample pusher in a lab automation deck
The 12 mm bore fits narrow deck spacing, and the 50 mm stroke moves sample trays between stations at 30-500 mm/s with the TPU bumper softening each end.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-20B with the ACEJ12X50-20B
At 12 mm bore this is the smallest force class in the range: 56.5 N push at 0.5 MPa. Step up to the 16 mm bore for 100.5 N or the 20 mm bore for 157.1 N at the same pressure if your load needs more headroom. The adjuster is a mechanical end stop for the extend stroke only - it does not lock the piston mid-stroke, so on air loss the rod still drifts; use a separate valve or lock for load holding. Mounting options are FA/FB flange and LB foot, and the optional -S magnet is required if you want CMSE / DMSE switch feedback. Order the ACEJ12X50 instead, since this ACPJ version is discontinued.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X50-20B
- ✓ 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 ACPJ12X50-20B 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. In practice, budget about 34 N (roughly 60% of the push rating) for real work, which is about 3 kg of vertical lift - or around 1.7 kg with a 2:1 safety margin.
The -20 code gives a 20 mm window: an external stop screw shortens the 50 mm extend stroke to any setting between 30 and 50 mm. It is an end stop, not a mid-stroke lock, so the piston still drifts if air is lost. This ACPJ is discontinued; the current-production replacement is the ACEJ12X50 (same bore, stroke and force class) - confirm the ISO 21287 mounting dimensions before swapping, since the ACP series was DIN-standard.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X50-20B
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X50-20B replacement — usually within 7-8 hours.