Airtac ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB
The AirTAC ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB is a genuine double acting, double rod, adjustable stroke ISO 21287 compact air cylinder with a Ø16mm bore and 40mm stroke, M5×0.8 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.
- BoreØ16 mm
- Stroke40 mm
- Port sizeM5×0.8
- Acting typeDouble acting, double rod, adjustable stroke
- Rod threadM4×0.7
- 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 ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB
The ACEJ16X40-20SB is a double acting AirTAC compact cylinder built to ISO 21287, with a 16 mm bore and a 40 mm stroke that an external stop screw trims anywhere in a 20 mm window, giving a usable extend range of 20-40 mm. At 0.5 MPa it pushes 100.5 N and pulls 75.4 N, rising to 140.7 N at 0.7 MPa. Because the short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, it slots into tight fixtures where a full-length body cannot. As a rule of thumb, plan on roughly 60 N (about 6 kg of vertical lift) of real work at 0.5 MPa instead of the full rating.
The S code means the magnet is fitted on this unit, so CMSE or DMSE reed and solid-state switches can be clamped into the body slots for end-of-stroke signalling. The B code gives a male rod thread on the 8 mm rod, while the M5x0.8 ports take standard PT fittings. A hard-anodized aluminium body, S45C hard-chrome rod and fixed TPU bumpers at both ends round out a spec of 0.15-1.0 MPa (22-145 psi), -20 to +70 C and 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø16 mm |
| Stroke | 40 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 TPU bumper (both ends) |
| Max standard stroke | Up to 75 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 (Ø16mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 75 N |
| 0.7 MPa | 106 N |
| Max (@1.0 MPa) | 15 kgf |
ACEJ 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 ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 16 | Bore size in mm. |
| ×40 | 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 (double rod, 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 ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB Is Used
Small-part ejection from plastic molds
The trimmed 20-40 mm extend range nudges finished caps or connectors off a mold face, with about 6 kg of usable vertical force at 0.5 MPa enough for lightweight parts.
Position-confirmed indexing on assembly benches
With the magnet fitted, CMSE or DMSE switches report both end positions on a 40 mm indexing move, letting a PLC verify each part seat before the next station fires.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB the Right Cylinder?
Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock, so the rod still drifts if air is lost. If you need foot or flange mounting, FA and LB brackets bolt straight to the ISO 21287 face, and the fitted magnet keeps CMSE / DMSE sensing available without reordering.
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 ACEJ12 Adjustable Compact Cylinder ACEJ16X40-20SB FAQ
The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 40 mm extend stroke on site, so the working range is 20-40 mm. It shortens only - it never extends past 40 mm, and it is a mechanical end stop, not a load-holding brake.
It is an ISO 21287 compact cylinder whose body saves about 50% of the mounting length of an ISO 15552 profile cylinder, with a fixed TPU bumper at each end absorbing end-of-stroke energy. This S-coded unit carries the optional magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots; without the S code there is no magnet. FA flange and LB foot brackets plus I and Y rod knuckles bolt to the standard ISO 21287 face, and the B code provides a male thread on the 8 mm rod.
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Standard models are processed and dispatched in 3-5 business days.
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