This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X45-20, 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 ACPJ12X45-20
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X45-20 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 ACEJ12X45-20 (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 → ACEJ12X45-20
- 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 ACPJ12X45-20
The ACPJ12X45-20 is a double acting compact cylinder with an adjustable extend stroke: a stop screw trims the 45 mm stroke by up to 20 mm on site, giving a usable 25-45 mm range. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N push. As a rule of thumb, plan on roughly 34 N (about 3 kg) of real work per move rather than the full rating.
Its ISO 21287 short 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 cannot. The hard-anodized aluminium body carries an S45C hard-chrome rod, fixed TPU bumpers sit at both ends, and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). Note this model is discontinued: the current-production drop-in is ACEJ12X45, so confirm ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-20 Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-20 |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X45-20 |
| 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 ACEJ12X45-20 (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 (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 ACPJ12X45-20
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×45 | 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 ACPJ12X45-20 Is Used
Micro press for connector crimping
The 56.5 N push at 0.5 MPa (79.2 N at 0.7 MPa) suits light crimping of wire terminals, and the 20 mm window lets operators dial the extend stop to the exact crimp depth between 25 and 45 mm.
Small-part ejection on a packaging line
A 45 mm stroke with a 6 mm rod ejects blister-cavity parts or caps from shallow nests; the short ISO 21287 body fits under low guarding where an ISO 15552 profile cylinder would not.
Gated stop on an electronics assembly fixture
The adjustable stop sets a repeatable extend position for PCB hold-down clamps, while fixed TPU bumpers soften both ends at speeds up to 500 mm/s.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-20 with the ACEJ12X45-20
Size both ways: if 56.5 N at 0.5 MPa is marginal for your load, step up to bore 16 (100.5 N push at 0.5 MPa); if it is generous, bore 12 is already the smallest in this family. The -20 window suits fixtures where the final extend position is tuned after installation. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock - on air loss the piston still drifts. This unit has no magnet fitted (no S code), so no CMSE / DMSE switch can be mounted; order an -S variant if sensing is needed. FA/FB flange and LB foot mountings bolt to the ISO 21287 face. Since ACPJ12X45-20 is discontinued, order ACEJ12X45 and verify mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X45-20
- ✓ 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 ACPJ12X45-20 FAQ
Bore 12 mm, stroke 45 mm with a 20 mm adjustment window (usable 25-45 mm). Push 56.5 N and pull 42.4 N at 0.5 MPa; push 79.2 N and pull 59.4 N at 0.7 MPa; theoretical maximum 11.5 kgf at 1.0 MPa. Port is M5x0.8, rod thread is female M3x0.5, operating pressure 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, TPU bumper both ends.
An external stop screw shortens the extend stroke by up to 20 mm within the ordered window; it cannot lengthen the stroke past 45 mm and it is not a load-holding brake. The ACPJ family is discontinued - the current-production drop-in is ACEJ12X45 (swap the P for an E), which matches the same bore, stroke and force class. Confirm ISO 21287 mounting dimensions before swapping, since the ACP was built to a DIN standard.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X45-20
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X45-20 replacement — usually within 7-8 hours.