Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40SB 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 ACEJ20X40-40SB
The ACEJ20X40-40SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 40 mm stroke anywhere within the ordered -40 window, so one cylinder covers a 0-40 mm working range without changing hardware. At 0.5 MPa the 20 mm bore delivers 157.1 N on the push stroke and 117.8 N on the pull stroke, rising to 219.9 N push at 0.7 MPa.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, which is why it slots into tight fixture plates and sliding guards. A practical sizing note: 157.1 N at 0.5 MPa equates to roughly 16 kg of lift, so halving that for a 2:1 margin means this unit lifts about 8 kg vertically with confidence. The -S code on this model means the magnet is fitted, so CMSE / DMSE reed or solid-state switches can be mounted directly in the body slots.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40SB |
|---|---|
| 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 ACEJ20X40-40SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACEJ20X40-40SB Is Used
Fixture clamping on CNC pallets
The 0-40 mm trimmed stroke clamps varying fixture heights on a machining pallet, with 157.1 N push at 0.5 MPa holding light aluminum parts steady during drilling.
Small-part diverting on conveyors
Mounted alongside a conveyor lane, the adjustable stop lets technicians dial the pusher throw in seconds to divert blister packs or cartons without swapping cylinders.
Position-verified test stations
Because the -S magnet is fitted, CMSE or DMSE switches confirm extend and retract at an electronics test bench, while the TPU bumper quiets each end of travel.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X40-40SB the Right Cylinder?
Size both ways before ordering: the 16 mm bore pushes 100.5 N at 0.5 MPa, while the 25 mm bore reaches 245.4 N, so pick the 20 mm when your load sits between those classes. Remember the stop screw is a mechanical end stop for the extend stroke, not a mid-stroke lock - on air loss the piston still drifts, so add a separate valve or brake if you must hold position.
This model carries the optional -S magnet and a male rod thread (B code) with PT ports; FA flange or LB foot mounts and I/Y rod knuckles bolt straight to the ISO 21287 face.
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 ACEJ20X40-40SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa those rise to 219.9 N push and 164.9 N pull, with a theoretical maximum of 32 kgf at 1.0 MPa. The 40 mm extend stroke is adjustable via the external stop screw across the full -40 window, giving a usable 0-40 mm range. Operating pressure is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, and the port is M5x0.8.
The hard-anodized aluminium body follows ISO 21287, cutting mounting length by about 50% versus an ISO 15552 profile cylinder, with an S45C hard-chrome rod and fixed TPU bumpers at both ends. The magnet is the optional -S code, and this model carries it, so CMSE / DMSE switches can be clipped into the body slots for end-of-stroke sensing. FA flange, LB foot and rod knuckle accessories mount on the standard face.
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