Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 45mm 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
- Stroke45 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 ACEJ20X45-20S
The ACEJ20X45-20S is a double acting AirTAC compact cylinder built to ISO 21287, with a 20 mm bore, 45 mm stroke and a 20 mm adjustment window. An external stop screw trims the extend stroke on site anywhere from 25 mm to 45 mm, so one cylinder covers several fixture positions without re-plumbing. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those figures rise to 219.9 N and 164.9 N.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it suits tight jigs, guarding and small gantries. Because about 60% of the push force is a realistic working figure, plan for roughly 94 N of real work at 0.5 MPa - the same as lifting about 9 kg vertically, or around 4-5 kg with a 2:1 margin. The S code means the magnet is fitted, so CMSE / DMSE switches can be clamped straight onto the body slots.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 45 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 ACEJ20X45-20S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | 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 ACEJ20X45-20S Is Used
Small jig clamping
The 157.1 N push at 0.5 MPa clamps brackets or machined caps in drilling and tapping jigs, while the 25-45 mm trim range lets one fixture handle parts of slightly different heights.
Position-verified ejection
With the fitted magnet, CMSE or DMSE switches confirm extend and retract on a pick-off station pushing small housings off a conveyor at up to 500 mm/s.
Bench press assist
Around 9 kg of vertical working load at 0.5 MPa suits light staking or snap-fit pressing on an electronics assembly bench, with the stop screw setting the exact top-of-stroke position.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S the Right Cylinder?
Size both ways before committing: a 16 mm bore gives 100.5 N push at 0.5 MPa, while a 25 mm bore lifts that to 245.4 N - if your part weight or clamp force sits near the 20 mm limit, step up. Remember the stop screw only shortens the extend stroke and is a mechanical end stop, not a mid-stroke lock, so the rod still drifts if air is lost. FA flange, LB foot and I/Y rod knuckles bolt to the ISO 21287 face, and this unit already carries the optional -S magnet for CMSE / DMSE switch mounting.
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 ACEJ20X45-20S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N and pull 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. The -20 code is a 20 mm adjustment window: an external stop screw shortens the 45 mm extend stroke, giving a usable range of 25-45 mm. It is a mechanical end stop only - it never holds a load if air pressure drops.
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. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches mount in the body slots. FA flange, LB foot and I/Y rod knuckles bolt straight to the standard face; the rod end is a female M6x1.0 thread and the port is M5x0.8.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.