Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 80mm 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.
- BoreØ20 mm
- Stroke80 mm
- Port sizeM5×0.8
- Acting typeDouble acting, adjustable stroke
- Rod threadM6×1.0
- CushionFixed TPU bumper (both ends)
About the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S
A double acting ISO 21287 compact cylinder with an adjustable extend stroke, the ACEJ20X80-20S pairs a 20 mm bore with an 80 mm stroke and a 20 mm trim window. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend side at 0.7 MPa. The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures, guards and small gantries. This -S version carries the optional magnet, so CMSE or DMSE reed and solid-state switches can be clamped anywhere along the body for end-of-stroke signalling.
On the practical side, plan for roughly 94 N of real work at 0.5 MPa (about 0.6 of the push rating) rather than the full 157.1 N. For vertical duties that equates to lifting about 8 kg with a 2:1 margin, enough for small clamps, part presenters and light pick-and-place heads. The external stop screw shortens the extend stroke on site anywhere in the 60-80 mm range; it is a mechanical end stop only, so on air loss the piston still drifts. A fixed TPU bumper at each end absorbs end-of-stroke shock, and the hard-anodized aluminium body with an S45C hard-chrome rod stands up to continuous cycling at 30-500 mm/s.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 80 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | M5×0.8 |
| Rod thread | M6×1.0 |
| 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 100 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | 165 N |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S Is Used
Small-parts clamping on assembly fixtures
The 157.1 N push at 0.5 MPa clamps brackets, covers and PCB trays in electronics and appliance assembly, with the 60-80 mm trim range matching shallow fixture depths.
Light vertical lift in pick-and-place heads
With a 2:1 margin the rod lifts about 8 kg vertically, ideal for raising small castings or vials onto a conveyor_belt transfer station; the fitted magnet feeds CMSE switch signals to the PLC.
Stroke-trimmed ejector on packaging machines
On carton and blister lines the stop screw lets technicians dial the extend stroke between 60 and 80 mm to clear product of varying heights without changing the cylinder.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X80-20S the Right Cylinder?
At 20 mm bore you sit mid-range for this series: the 16 mm bore delivers 100.5 N push at 0.5 MPa, while the 25 mm bore steps up to 245.4 N. If your load needs more than about 94 N of usable force, move to the 25 mm frame. The 80 mm stroke is well inside the 100 mm maximum standard stroke for this bore, so it ships as a catalogue item. Mounting is via FA flange, LB foot or FTC brackets with I and Y rod knuckles on the ISO 21287 face. The female M6x1.0 rod thread suits standard rod accessories; order the B variant if you need a male thread. Remember the stop screw trims the extend stroke only and does not hold a load mid-stroke.
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 ACEJ20X80-20S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push rises to 219.9 N. The theoretical maximum is 32 kgf at 1.0 MPa. In practice budget about 94 N (0.6 of push) for real work, which supports lifting roughly 8 kg vertically with a 2:1 margin. Operating pressure is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating, and speed spans 30-500 mm/s.
The -20 code sets a 20 mm adjustment window: an external stop screw shortens the 80 mm extend stroke to any length from 60 to 80 mm, and a fixed TPU bumper at each end absorbs the remaining end-of-stroke energy. The stop is a mechanical end stop, not a mid-stroke lock, so the rod can drift if air is lost. The S in the code means the optional magnet is fitted, so CMSE or DMSE reed or solid-state switches can be mounted along the body. The hard-anodized ISO 21287 compact body takes FA flange, LB foot and FTC brackets and is about 50% shorter in mounting length than an ISO 15552 profile cylinder.
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