Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke40 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 ACEJ20X40-30SB
A double acting compact cylinder built to ISO 21287, the ACEJ20X40-30SB pairs a 20 mm bore with a 40 mm stroke that an external stop screw trims anywhere in a 30 mm window, giving a usable extend range of 10-40 mm. 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, with a theoretical ceiling of 32 kgf at 1.0 MPa. The hard-anodized aluminium body is roughly 50% shorter in mounting length than an ISO 15552 profile cylinder, so it slots into tight jigs and guarding where a full-length body cannot.
Because the -S magnet is fitted on this model, CMSE or DMSE reed and solid-state switches mount directly in the body slots for end-of-travel signalling. The male rod thread (B code) suits couplers and tooling plates, and the fixed TPU bumper at each end absorbs end-of-stroke shock without any adjustment. In practice, plan on about 94 N of real work at 0.5 MPa, which lifts roughly 8 kg vertically with a 2:1 margin.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 40 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 ACEJ20X40-30SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -30 | 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 ACEJ20X40-30SB Is Used
Small-parts press fitting
The 157.1 N push at 0.5 MPa seats bearings, bushings or connectors into plastic housings on an electronics assembly bench, with the 10-40 mm trim matching varying part heights.
Pick-and-place verification
With the fitted magnet driving CMSE switches, a gantry loader confirms clamp and release positions on 40 mm travel before the robot handoff proceeds.
Test fixture lift gate
A leak-test rig raises an 8 kg fixture lid vertically within the 2:1 margin, the male rod thread taking a clevis or knuckle for pivoting motion.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-30SB the Right Cylinder?
For a 40 mm stroke class, compare against the neighbouring bores: the 16 mm size delivers 100.5 N push at 0.5 MPa while the 25 mm bore reaches 245.4 N, so pick the 20 mm when your load sits between those two. Remember the stop screw only shortens the extend stroke and is not a mid-stroke lock - with air lost the piston still drifts, so add a separate holding valve if the load must stay put. FA flange or LB foot mountings bolt to the standard ISO 21287 face, and the fitted -S magnet means CMSE / DMSE switches work out of the box.
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 ACEJ20X40-30SB FAQ
At 0.5 MPa the 20 mm bore pushes 157.1 N and pulls 117.8 N. At 0.7 MPa it delivers 219.9 N push and 164.9 N pull. The theoretical maximum is 32 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa (22-145 psi) with proof pressure of 1.5 MPa (215 psi), and speed runs 30-500 mm/s. For sizing, treat about 94 N as the practical working force at 0.5 MPa.
The -30 code sets a 30 mm adjustment window: an external stop screw shortens the 40 mm extend stroke on site, so the effective range is 10-40 mm. It is a mechanical end stop only - it never holds or brakes a load if air is lost. The body carries the optional -S magnet that this model includes, so CMSE and DMSE reed or solid-state switches mount in the body slots. Fixed TPU bumpers at both ends absorb end-of-stroke energy, and FA flange or LB foot mounts attach to the standard ISO 21287 interface.
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