This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X45-50B, 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 ACPJ12X45-50B
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X45-50B is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 45mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X45-50B (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke45 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X45-50B
- 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 ACPJ12X45-50B
The ACPJ12X45-50B is a double acting, adjustable-stroke compact cylinder from AirTAC's DIN-standard ACP family, now discontinued. Its 12 mm bore delivers 56.5 N of push and 42.4 N of pull at 0.5 MPa, rising to 79.2 N at 0.7 MPa. The -50 code sets a 50 mm adjustment window: an external stop screw trims the 45 mm extend stroke on site, so the usable range runs from 0 to 45 mm without changing cylinders. The B code specifies a male rod thread instead of the standard female version.
The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs, guards and gantries. A hard-anodized aluminium body carries an S45C hard-chrome 6 mm rod, with fixed TPU bumpers at both ends. In practical terms the 56.5 N push supports roughly 34 N of real work at 0.5 MPa, which lifts about 2.9 kg vertically with a 2:1 margin. This model is discontinued; the current-production drop-in is ACEJ12X45, and buyers should confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50B Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50B |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X45-50B |
| Bore size | Ø12 mm |
| Stroke | 45 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 ACEJ12X45-50B (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 ACPJ12X45-50B
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACPJ12X45-50B Is Used
Micro part ejection from press dies
The 56.5 N push at 0.5 MPa clears small stamped clips and terminals off a die face, while the 0-45 mm adjustable range lets the setter dial the exact eject length per tool.
Clamping on compact test fixtures
With about 34 N of usable working force and a male rod thread for knuckle links, the 12 mm bore holds light PCB or sensor housings inside a tight test nest.
Low-profile indexing pin on conveyor stops
The short body fits under guard rails where a full-length ISO 15552 profile cylinder will not, retracting a stop pin between 30-500 mm/s cycles.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50B with the ACEJ12X45-50B
At 12 mm bore this is the smallest ACPJ size: 56.5 N push at 0.5 MPa versus 100.5 N for the 16 mm bore and 157.1 N for the 20 mm bore, so step up if your fixture needs more than about 34 N of working force. The 45 mm stroke sits inside the 50 mm maximum standard stroke for this bore, so no made-to-order tooling is required. The male rod thread (B code) suits knuckle and bracket attachments; FA/FB flange and LB foot mountings bolt to the same face. No magnet is fitted on this version, so position switches cannot be used; order the -S variant if CMSE / DMSE sensing is planned. Since ACPJ is discontinued, specify ACEJ12X45 as the current replacement and verify the ISO 21287 mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X45-50B
- ✓ 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 ACPJ12X45-50B 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. Plan on about 34 N (0.6 of the push rating) for real work, which lifts roughly 2.9 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed range 30-500 mm/s.
The -50 code gives a 50 mm adjustment window: an external stop screw shortens the 45 mm extend stroke on site to any length from 0 to 45 mm. It is a mechanical end stop only, so the piston still drifts if air is lost. The ACPJ family is discontinued; the current-production drop-in is ACEJ12X45 in the same bore, stroke and force class. Confirm the ISO 21287 mounting dimensions before swapping, since the ACP was built to a DIN standard.
Related AirTAC ACE Cylinders
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