This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X45-50SB, 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 ACPJ12X45-50SB
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X45-50SB 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 ACEJ12X45-50SB (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 → ACEJ12X45-50SB
- 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 ACPJ12X45-50SB
This is a double acting, adjustable-stroke compact cylinder in the discontinued AirTAC ACPJ family. The 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N at 0.7 MPa, with a theoretical maximum of 11.5 kgf at 1.0 MPa. The -50 code sets a 50 mm adjustment window: a stop screw trims the 45 mm extend stroke on site, so the usable range is 0-45 mm. The B code gives a male rod thread on the 6 mm rod, and the S code means the optional -S magnet is fitted, so CMSE / DMSE reed or solid-state switches can be mounted directly on the hard-anodized aluminium body.
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 fixed TPU bumper sits at both ends, and speed runs 30-500 mm/s at 0.15-1.0 MPa (22-145 psi). Plan on roughly 34 N of real work at 0.5 MPa (about 0.6 of the push rating), which lifts about 3 kg vertically with a 2:1 margin. Note this model is discontinued: the current-production drop-in is ACEJ12X45, same bore, stroke and force class - confirm the ISO 21287 mounting dimensions before swapping, since the ACP is DIN-standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50SB Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50SB |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X45-50SB |
| 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 ACEJ12X45-50SB (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 ACPJ12X45-50SB
| 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 ACPJ12X45-50SB Is Used
Micro jig clamping
Clamps small machined parts in drilling fixtures, where 56.5 N at 0.5 MPa is enough and the 0-45 mm trimmed stroke clears the swarf shield.
Position-verified ejector
Ejects tiny components from a nest with the fitted -S magnet driving CMSE switches, so the PLC confirms both extend and retract.
Lab dosing slide
Pushes a micro-dosing carriage in a compact analytical rig, where the short body fits inside the housing and the male rod thread accepts a knuckle.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X45-50SB with the ACEJ12X45-50SB
Size both ways before ordering: the 16 mm bore gives 100.5 N push at 0.5 MPa if 56.5 N is marginal, while staying at bore 12 keeps the M5x0.8 port and 6 mm rod in the smallest envelope. The stop screw only shortens the extend stroke within the 50 mm window - it is a mechanical end stop, 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 the fitted -S magnet pairs with CMSE / DMSE switches. For new designs, order the ACEJ12X45 replacement instead.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X45-50SB
- ✓ 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 ACPJ12X45-50SB FAQ
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 and 59.4 N pull. The theoretical maximum at 1.0 MPa is 11.5 kgf. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, and the M5x0.8 port serves the 12 mm bore.
The -50 code is a 50 mm window: a stop screw shortens the 45 mm extend stroke anywhere in that range, giving 0-45 mm of usable travel, with a fixed TPU bumper at each end. 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, as the ACP is DIN-standard.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X45-50SB
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X45-50SB replacement — usually within 7-8 hours.