Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40S 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 ACEJ20X45-40S
The ACEJ20X45-40S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 45 mm stroke that an external stop screw trims anywhere in a 40 mm window, giving a usable extend range of 5-45 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, and the hard-anodized aluminium body with an S45C hard-chrome plated rod keeps the envelope short for tight fixtures.
The short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim jigs and guarding where a full-length cylinder cannot. Plan on roughly 94 N (about 9.6 kgf) of real work at 0.5 MPa, which is a vertical lift of about 8 kg with a 2:1 margin. The -S magnet is fitted, so CMSE / DMSE switches can be bolted to the body slots for end-of-stroke sensing.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40S |
|---|---|
| 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 ACEJ20X45-40S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | Stroke length in mm. |
| -40 | 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 ACEJ20X45-40S Is Used
Fixture clamping on CNC jigs
Trims the clamp stroke from 45 mm down to as little as 5 mm to suit different part heights on the same jig, with 157.1 N push at 0.5 MPa holding thin aluminium workpieces.
Position-verified ejector on small assembly cells
The fitted -S magnet accepts CMSE / DMSE switches so the PLC confirms the eject stroke before the next part is presented, at speeds of 30-500 mm/s.
Compact press-fit of connector pins
About 9.6 kgf of usable push at 0.5 MPa seats pins and terminals in electronics housings, and the short ISO 21287 body fits inside the press head where a profile cylinder will not.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-40S the Right Cylinder?
Size both ways: the 16 mm bore gives 100.5 N push at 0.5 MPa if your load is lighter, while the 25 mm bore delivers 245.4 N when you need more headroom. This 20 mm unit suits mid-range clamping around a 90-95 N working load. The stop screw is a mechanical end stop for the extend stroke only, not a mid-stroke lock, so on air loss the piston can still drift. FA flange, LB foot and I/Y rod knuckles mount on the ISO 21287 face; the fitted -S magnet pairs with CMSE / DMSE switches.
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 ACEJ20X45-40S 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 and pull to 164.9 N, with a theoretical maximum of 32 kgf at 1.0 MPa. It is double acting with an adjustable extend stroke: the stop screw trims the 45 mm stroke within the 40 mm window, so the usable range is 5-45 mm. 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, and the port is M5x0.8.
It is an ISO 21287 compact cylinder with a hard-anodized aluminium body, threaded aluminium covers and a fixed TPU bumper at each end that decelerates the piston at the ends of travel. The body is about 50% shorter in mounting length than an ISO 15552 profile cylinder. The -S magnet is fitted on this model, so CMSE / DMSE reed or solid-state switches can be clipped into the body slots; FA flange, LB foot and I/Y rod knuckles bolt straight to the mounting face.
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 ACEJ20X45-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.