This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X40-30S, 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 ACPJ12X40-30S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X40-30S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 40mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X40-30S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X40-30S
- 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 ACPJ12X40-30S
This ACPJ12X40-30S is a double acting compact cylinder with an adjustable extend stroke, now discontinued. The 12 mm bore delivers 56.5 N of push and 42.4 N of pull at 0.5 MPa (79.2 N and 59.4 N at 0.7 MPa), and the -30 code gives a 30 mm trim window, so the stop screw lets you set any extend stroke from 10 to 40 mm on site. A fixed TPU bumper sits at both ends and the rod speed runs 30-500 mm/s.
The hard-anodized aluminium body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which makes it easy to tuck into a compact jig or a slim inspection gantry. Because the -S code is on this unit, the magnet is fitted and CMSE / DMSE reed or solid-state switches can be clamped straight onto the tube. For sizing, treat roughly 34 N (about 0.6 of the push rating) as the practical work force at 0.5 MPa, which corresponds to lifting roughly 3.4 kg vertically at full pressure headroom halved. When you replace it, order the ACEJ12X40 - the current ISO 21287 successor in the same bore, stroke and force class - and confirm the mounting dimensions first, since the ACP was built to a DIN-standard footprint.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-30S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-30S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X40-30S |
| Bore size | Ø12 mm |
| Stroke | 40 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 ACEJ12X40-30S (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 ACPJ12X40-30S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -30 | 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 ACPJ12X40-30S Is Used
Micro part ejection from a CNC fixture
The 10-40 mm trim range lets a machinist dial the ejector stroke to clear a 6 mm finished pin without re-clamping the fixture, using about 56.5 N of push at 0.5 MPa.
Position-verified slide on a lab automation deck
With the fitted magnet and a CMSE switch clamped at the retracted end, the PLC confirms the 12 mm bore slide is home before the pick cycle starts.
Light press-fit of nylon bushings
About 34 N of usable work force at 0.5 MPa is enough to seat small nylon bushings into PCB enclosure bosses, and the stop screw caps the depth repeatably.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X40-30S with the ACEJ12X40-30S
Size both ways before you commit: the 16 mm bore in this family pushes 100.5 N at 0.5 MPa if your clamp needs more force, while the same 12 mm bore in a fixed-stroke ACP12X40 suits jobs that never need trimming. Remember the stop screw only shortens the extend stroke and does not lock the piston - on air loss the rod still drifts, so add an external stop if you must hold position. Match FA/FB flange or LB foot mounts to your fixture, keep the optional -S magnet in mind for CMSE / DMSE switch positions, and specify the ACEJ12X40 as the current-production replacement.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X40-30S
- ✓ 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 ACPJ12X40-30S FAQ
At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa those rise to 79.2 N and 59.4 N, with a theoretical maximum of 11.5 kgf at 1.0 MPa. Plan on roughly 34 N of real work at 0.5 MPa, which is about 3.4 kg of vertical lift with a sensible margin. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), and speed 30-500 mm/s.
The -30 code sets a 30 mm window: an external stop screw shortens the 40 mm extend stroke anywhere down to 10 mm, so the usable range is 10-40 mm. It is a mechanical end stop only - it never holds a load if air is lost. The ACPJ family is discontinued; the current-production drop-in is the ACEJ12X40, an ISO 21287 cylinder in the same bore, stroke and force class. Confirm the ISO 21287 mounting dimensions before swapping, because the ACP was DIN-standard, and note the M5x0.8 port and M3x0.5 female rod thread carry over by bore size.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X40-30S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X40-30S replacement — usually within 7-8 hours.