This model is discontinued
AirTAC has phased out the ACP series. You can still order this code here: we ship the current replacement ACEJ16X125-50S, 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 ACPJ16X125-50S
The AirTAC ACPJ Adjustable Compact Cylinder ACPJ16X125-50S is a double acting, double rod, adjustable stroke DIN-standard tight/compact air cylinder with a Ø16mm 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 ACEJ16X125-50S (ISO 21287 ACE), in the same bore, stroke and force class.
- BoreØ16 mm
- Stroke125 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM4×0.7
- StatusDiscontinued → ACEJ16X125-50S
- 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 ACPJ16X125-50S
This is a double acting compact cylinder with an adjustable extend stroke: the -50 stop screw trims the 125 mm stroke by up to 50 mm on site, giving a usable 75-125 mm range. At 0.5 MPa it pushes 100.5 N and pulls 75.4 N; at 0.7 MPa that rises to 140.7 N. The 125 mm stroke is longer than the 75 mm standard maximum for a 16 mm bore, so this unit is made to order. Note that ACPJ is discontinued - the current-production replacement is ACEJ16X125 in the same bore, stroke and force class.
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. The fitted -S magnet lets you add CMSE or DMSE reed or solid-state switches for end-of-stroke sensing. As a rule of thumb, plan on roughly 60 N (about 6 kg of vertical lift with a 2:1 margin) of real work at 0.5 MPa rather than the full 100.5 N rating. The stop screw sets the extend position only - it is not a mid-stroke lock, so the rod can still drift if air is lost.
Airtac ACPJ Adjustable Compact Cylinder ACPJ16X125-50S Technical Specifications
| Model | Airtac ACPJ Adjustable Compact Cylinder ACPJ16X125-50S |
|---|---|
| Series | ACPJ DIN compact cylinder (discontinued) |
| Replacement | ACEJ16X125-50S |
| Bore size | Ø16 mm |
| Stroke | 125 mm |
| Acting type | Double acting, double rod, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M4×0.7 |
| 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 75 mm |
Specifications follow the official AirTAC ACP datasheet (now discontinued). The ACEJ16X125-50S (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 (Ø16mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 75 N |
| 0.7 MPa | 106 N |
| Max (@1.0 MPa) | 15 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 ACPJ16X125-50S
| ACPJ | DIN compact cylinder (adjustable-stroke, discontinued). |
|---|---|
| 16 | 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 ACPJ16X125-50S Is Used
Fixture clamping on CNC jigs
The 75-125 mm trim range lets one cylinder serve several fixture depths, with 100.5 N push at 0.5 MPa clamping light aluminium parts during drilling.
Packaging line push-off
At 30-500 mm/s the rod ejects cartons or blisters from a conveyor lane; the fitted magnet drives a CMSE switch to confirm each extend stroke.
Lab sample press
About 6 kg of usable vertical force at 0.5 MPa presses stoppers or lids onto small vials, and the compact body fits inside a benchtop guard.
Replacing the Airtac ACPJ Adjustable Compact Cylinder ACPJ16X125-50S with the ACEJ16X125-50S
Size both ways before ordering: a 12 mm bore gives 56.5 N push at 0.5 MPa, while a 20 mm bore gives 157.1 N - this 16 mm model's 100.5 N sits between them. If your load needs the rod held under power mid-travel, remember the adjuster is an end stop only. FA/FB flange and LB foot mountings bolt to the standard face, and the -S magnet is already fitted here for CMSE / DMSE switches. Since ACPJ is discontinued, order ACEJ16X125 as the drop-in successor and confirm ISO 21287 mounting dimensions before the swap.
Replacement checklist
- ✓ Current-production ACE → ACEJ16X125-50S
- ✓ 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 ACPJ16X125-50S FAQ
At 0.5 MPa it pushes 100.5 N and pulls 75.4 N; at 0.7 MPa it pushes 140.7 N and pulls 105.6 N, with a theoretical maximum of 20.5 kgf at 1.0 MPa. The -50 stop screw shortens the 125 mm extend stroke by up to 50 mm, so the working range is 75-125 mm. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the 125 mm stroke is a made-to-order length above the 75 mm standard maximum for this bore.
An external stop screw on the head trims the extend stroke anywhere within the ordered 50 mm window - it shortens the stroke, never lengthens it past 125 mm. A fixed TPU bumper at each end decelerates the piston; it does not hold or brake a load, and on air loss the rod can drift. ACPJ is discontinued: the current drop-in is ACEJ16X125 (same bore, stroke and force class), so confirm the ISO 21287 mounting dimensions before swapping. The -S magnet on this unit accepts CMSE / DMSE switches.
Related AirTAC ACE Cylinders
Request a Quote for the ACEJ16X125-50S
Send us the quantity and destination. We confirm price, stock and lead time on the ACEJ16X125-50S replacement — usually within 7-8 hours.