This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X50-40S, 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 ACPJ12X50-40S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X50-40S 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 ACEJ12X50-40S (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 → ACEJ12X50-40S
- 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 ACPJ12X50-40S
The ACPJ12X50-40S is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 50 mm stroke by up to 40 mm, giving a usable range of 10-50 mm. At 0.5 MPa the 12 mm bore pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N push. The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body will not fit.
Because the -S code is ordered, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be mounted directly on the hard-anodized aluminium body. Plan for roughly 34 N (about 3.4 kg) of real work at 0.5 MPa, or lift about 2.9 kg vertically with a 2:1 margin. Note this model is discontinued: the current-production drop-in is the ACEJ12X50, so confirm ISO 21287 mounting dimensions before swapping from the DIN-standard ACP footprint.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-40S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-40S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X50-40S |
| 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 ACEJ12X50-40S (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 ACPJ12X50-40S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -40 | 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 ACPJ12X50-40S Is Used
Micro part ejection from machining fixtures
The 56.5 N push at 0.5 MPa is enough to strip small aluminium or brass chips and parts off a CNC jig, with the stop screw set to a 10-20 mm extend so the ejector clears only what it must.
Switch-monitored gate latch on a small enclosure
With the fitted -S magnet and a CMSE switch, a packaging line PLC confirms the 12 mm bore has reached the trimmed extend position before the next carton is released.
Light press-fit of nylon bushings
About 34 N of usable force at 0.5 MPa seats small plastic bushings in electronics assemblies, and the 10-50 mm adjustable range lets one cylinder serve several part heights.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X50-40S with the ACEJ12X50-40S
For light clamping and positioning, this 12 mm bore delivers 56.5 N push at 0.5 MPa; step down is not available in this family, while the 16 mm bore gives 100.5 N if more force is needed. The 40 mm window suits jobs where the final extend position is set on site rather than at ordering. The female M3x0.5 rod thread takes I/Y knuckles from the ISO 21287 mounting family, and FA flange or LB foot mounts bolt straight on. The fitted -S magnet works with CMSE / DMSE switches. Order the ACEJ12X50 as the current replacement and verify mounting dimensions against your fixture.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X50-40S
- ✓ 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 ACPJ12X50-40S FAQ
Push is 56.5 N and pull 42.4 N at 0.5 MPa; at 0.7 MPa push is 79.2 N and pull 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. It is double acting with a 40 mm adjustment window on the 50 mm stroke (usable 10-50 mm), M5x0.8 ports, a 6 mm rod with female M3x0.5 thread, operating pressure 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s and a fixed TPU bumper at both ends.
Order the ACEJ12X50, the current-production ISO 21287 successor: swap the P for an E and you get the same 12 mm bore, 50 mm stroke and force class in a matching short body. Because the ACP is DIN-standard, confirm the ISO 21287 mounting dimensions against your fixture before swapping. The ACEJ also accepts the -S magnet code for CMSE / DMSE switches.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X50-40S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X50-40S replacement — usually within 7-8 hours.