This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X120-40SB, 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 ACPJ12X120-40SB
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X120-40SB is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 120mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X120-40SB (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke120 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X120-40SB
- 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 ACPJ12X120-40SB
Double acting and adjustable in stroke, the ACPJ12X120-40SB is a discontinued DIN-standard compact cylinder with a 12 mm bore and a 120 mm made-to-order stroke (the standard maximum for this bore is 50 mm). A stop screw trims the extend stroke by up to 40 mm within the ordered -40 window, giving a usable range of 80-120 mm. At 0.5 MPa it pushes 56.5 N and pulls 42.4 N; at 0.7 MPa that rises to 79.2 N / 59.4 N, with a theoretical peak of 11.5 kgf at 1.0 MPa. The short ISO 21287-class body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding.
The -S code on this model means the position magnet is fitted, so CMSE / DMSE reed or solid-state switches can be clamped straight onto the hard-anodized aluminium body, and the B code gives a male rod thread on the 6 mm S45C hard-chrome rod. For sizing, treat roughly 34 N (about 0.6 of the 56.5 N push) as the realistic working force at 0.5 MPa, which lifts about 2.8 kg vertically with a 2:1 margin. Note the stop screw is a mechanical end stop only: on air loss the piston still drifts, so it is not a load-holding lock. This model is discontinued; the current-production drop-in is ACEJ12X120 - confirm the ISO 21287 mounting dimensions before swapping.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-40SB Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-40SB |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X120-40SB |
| Bore size | Ø12 mm |
| Stroke | 120 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 ACEJ12X120-40SB (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 ACPJ12X120-40SB
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×120 | 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 ACPJ12X120-40SB Is Used
Small-part ejection from plastic injection molds
The 56.5 N push at 0.5 MPa is enough to kick lightweight molded caps or bushings off the mold face, and the 80-120 mm adjustable range lets the setter dial the eject stroke to the part without re-plumbing.
Position-flagged slide gates on lab automation
With the fitted magnet and a CMSE or DMSE switch at each end, the 120 mm travel confirms open/closed status on a reagent or sample gate, while the short body fits inside a compact enclosure.
Clamping light aluminum brackets in welding jigs
About 34 N of usable clamp force at 0.5 MPa holds thin sheet or small brackets during tack welding; the male rod thread (B code) accepts an I or Y knuckle for a pivoting clamp arm.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X120-40SB with the ACEJ12X120-40SB
At 12 mm bore this is the smallest force class in the family: 56.5 N push at 0.5 MPa versus 100.5 N for a 16 mm bore and 157.1 N for a 20 mm bore, so step up if your part weight or friction load exceeds about 34 N of real work. The 120 mm stroke is non-standard and made to order for this bore. Mounting is FA/FB flange or LB foot on the compact face, and the fitted -S magnet lets CMSE / DMSE switches report end positions. If you need a fixed stroke instead, look at the ACP; for a double-rod version, the ACPD. For new projects, order the current ACEJ12X120 and verify the ISO 21287 mounting dimensions.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X120-40SB
- ✓ 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 ACPJ12X120-40SB FAQ
It is a double acting 12 mm bore cylinder: 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, and a theoretical maximum of 11.5 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, speed 30-500 mm/s, air filtered to 40 um, temperature -20 to +70 C, port M5x0.8, rod 6 mm with male thread, and a fixed TPU bumper at both ends. The 120 mm stroke is a made-to-order non-standard length for this bore.
Order the ACEJ12X120, the current-production ISO 21287 successor: swap the P for an E and you get the same bore, stroke and force class in a matching short body. Because the ACPJ is DIN-standard, confirm the ISO 21287 mounting dimensions against your fixture before swapping, and remember the magnet on this unit came from the -S option code, so specify -S on the ACEJ if you need CMSE / DMSE switch sensing.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X120-40SB
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X120-40SB replacement — usually within 7-8 hours.