This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ12X125-50SB, 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 ACPJ12X125-50SB
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ12X125-50SB is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø12mm bore and 125mm stroke, M5×0.8 air ports and a hard-anodized aluminium body. This model is discontinued — the current-production replacement is the ACEJ12X125-50SB (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ12 mm
- Stroke125 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM3×0.5
- StatusDiscontinued → ACEJ12X125-50SB
- 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 ACPJ12X125-50SB
This is a double acting compact cylinder with an adjustable stroke: a stop screw trims the 125 mm extend stroke by up to 50 mm, giving a usable range of 75-125 mm. The 12 mm bore delivers 56.5 N push and 42.4 N pull at 0.5 MPa, rising to 79.2 N push at 0.7 MPa, with a theoretical maximum of 11.5 kgf at 1.0 MPa. In practice, plan on roughly 34 N of real work at 0.5 MPa, which lifts about 2.8 kg vertically with a 2:1 margin. The 125 mm stroke exceeds the 50 mm standard maximum for bore 12, so it is a non-standard, made-to-order stroke.
The short ISO 21287-class 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 will not fit. A hard-anodized aluminium body carries an S45C hard-chrome rod with a male thread (B code), and this model carries the optional -S magnet, so CMSE / DMSE switches can be mounted. Fixed TPU bumpers sit at both ends. Note that the ACPJ family is discontinued: the current-production drop-in is the ACEJ12X125, and buyers should confirm ISO 21287 mounting dimensions before swapping, since the ACP is DIN-standard.
Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50SB Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50SB |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ12X125-50SB |
| Bore size | Ø12 mm |
| Stroke | 125 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 ACEJ12X125-50SB (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 ACPJ12X125-50SB
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 12 | Bore size in mm. |
| ×125 | 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 ACPJ12X125-50SB Is Used
Small-part ejection from jigs
The 56.5 N push at 0.5 MPa and 75-125 mm adjustable range suit ejecting light aluminium or plastic parts from drilling and tapping fixtures.
Position-verified clamping
With the -S magnet fitted, CMSE or DMSE switches confirm extend and retract on a 12 mm bore clamp rated 79.2 N push at 0.7 MPa.
Bench-top press assist
About 2.8 kg of vertical working load at a 2:1 margin makes this a fit for light pressing of connectors and small inserts on assembly benches.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ12X125-50SB with the ACEJ12X125-50SB
Bore 12 is the smallest in the family at 56.5 N push at 0.5 MPa; step up to bore 16 (100.5 N) or bore 20 (157.1 N) if the load needs more force. The -50 adjuster only shortens the extend stroke within its 50 mm window and is a mechanical end stop, not a mid-stroke lock, so the piston will still drift on air loss. FA/FB flange and LB foot mountings suit the ISO 21287 face, and the fitted -S magnet enables CMSE / DMSE switch sensing. This model is discontinued; order the ACEJ12X125 as the current replacement and verify mounting dimensions against the datasheet.
Replacement checklist
- ✓ Current-production ACE → ACEJ12X125-50SB
- ✓ 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 ACPJ12X125-50SB 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. Operating pressure is 0.15-1.0 MPa (22-145 psi) with proof pressure of 1.5 MPa (215 psi), speed 30-500 mm/s, and air filtered to 40 um.
The -50 code gives a 50 mm adjustment window: an external stop screw shortens the 125 mm extend stroke to any length from 75 mm up, and fixed TPU bumpers decelerate at both ends. The ACPJ is discontinued; the ACEJ12X125 is the current ISO 21287 drop-in successor in the same bore, stroke and force class - confirm the mounting dimensions before swapping.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ12X125-50SB
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ12X125-50SB replacement — usually within 7-8 hours.