Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20
The AirTAC Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø40mm bore and 25mm stroke, 1/8" air ports and a hard-anodized aluminium body. Its short compact envelope saves about 50% of the mounting length of an ISO 15552 profile cylinder.
- BoreØ40 mm
- Stroke25 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM8×1.25
- CushionFixed TPU bumper (both ends)
- 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 ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20
A double acting compact cylinder built to ISO 21287, the ACEJ40X25-20 pairs a 40 mm bore with a 25 mm stroke and an external stop screw that trims the extend stroke anywhere inside the ordered 20 mm window, giving a usable range of 5-25 mm. At 0.5 MPa it pushes 628.3 N and pulls 571.8 N; at 0.7 MPa those rise to 879.6 N and 800.5 N. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures and guarding where a full-length body cannot.
The hard-anodized aluminium body carries a S45C hard-chrome plated 12 mm rod, with a fixed TPU bumper at each end to absorb end-of-stroke impact. Plan on roughly 377 N of usable push at 0.5 MPa (about 0.6 of the rating), which corresponds to lifting about 32 kg vertically, or about 16 kg with a 2:1 margin. The magnet is not fitted on this code; order the optional -S version if you want CMSE / DMSE switch sensing.
Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 Technical Specifications
| Model | Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 TPU bumper (both ends) |
| Max standard stroke | Up to 200 mm |
Specifications follow the official AirTAC ACE-series (ISO 21287) datasheet. Body: hard-anodized aluminium alloy; piston rod: S45C carbon steel with hard-chrome plating. Rod type: female thread (blank) or male thread (B). Thread options: PT (blank) / G. A built-in magnet is OPTIONAL — add the -S code to fit CMSE / DMSE position sensors.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 572 N |
| 0.7 MPa | 880 N | 800 N |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| S | Optional built-in magnet for CMSE / DMSE sensors (omit for no magnet). |
| B | Rod type: B = male thread; blank = female thread. |
ACE-family variants: ACE (double acting), ASE / ATE (single acting push / pull), ACED (double rod), ACEJ (adjustable stroke), TACE / TACED (non-rotating twin-guide yoke). Mounting accessories: FA / FB flange, LB foot, CA / CB clevis, CR, SDB pivot, FTC; plus I and Y knuckles. Thread PT (blank) / G.
Where the Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 Is Used
Clamp fixture on a CNC milling pallet
The 5-25 mm adjustable range lets a jig builder dial in exact clamp travel per fixture, while 628.3 N at 0.5 MPa holds aluminium housings firmly through machining.
Carton kick-off on a packaging line
A short 25 mm stroke is ideal for nudging boxes off a conveyor lane; the compact body fits inside tight guarding where a longer profile cylinder will not.
Small-part ejection from an injection mold
With about 32 kg of vertical-lift equivalent at 0.5 MPa, the cylinder ejects lightweight molded caps reliably, and the TPU bumpers quiet the return stroke.
Is the Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 the Right Cylinder?
At 628.3 N push at 0.5 MPa, the 40 mm bore sits between the 32 mm (402.1 N) and 50 mm (981.7 N) sizes; step down for lighter clamping, up if your line pressure sags below 0.5 MPa. Remember the stop screw is a mechanical end stop only: on air loss the piston drifts, so it is not a load-holding brake. FA flange or LB foot mounts bolt to the ISO 21287 face, and the female M8x1.25 rod thread accepts standard rod knuckles. If position feedback matters, specify the -S magnet code at ordering, since it cannot be added later.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Short stroke fits the compact body
- ✓ Port/thread type (PT / G)
- ✓ Add -S if you need the magnet for sensors
- ✓ Rod type (female / male B) & mount (FA/LB/CA)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Compact body: keep the stroke short and avoid side load on the rod.
- check Do not dismantle the threaded front/back covers.
- check Keep speed within the rated range; the TPU bumper absorbs stroke-end energy.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACEJ32~40 Adjustable Cushion Compact Cylinder ACEJ40X25-20 FAQ
At 0.5 MPa it pushes 628.3 N and pulls 571.8 N; at 0.7 MPa push is 879.6 N and pull 800.5 N; theoretical maximum is 128.1 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-500 mm/s, temperature -20 to +70 C, air filtered to 40 um. The extend stroke is trimmed by an external stop screw within the 20 mm window (5-25 mm usable), and the 1/8" port depends on the 40 mm bore.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends. Sensing is possible only on the optional -S version, which carries a magnet for CMSE / DMSE switches; this standard code has no magnet, so no sensor can be mounted. FA flange and LB foot mounts, plus I/Y rod knuckles on the female M8x1.25 thread, bolt straight onto standard fixtures.
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