Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30SB is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 55mm 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
- Stroke55 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 ACEJ20X55-30SB
This ACEJ20X55-30SB is a double acting ISO 21287 compact cylinder with an adjustable extend stroke: an external stop screw trims the 55 mm stroke by up to 30 mm, giving a usable range of 25-55 mm without changing the order. At 0.5 MPa the 20 mm bore delivers 157.1 N push and 117.8 N pull, rising to 219.9 N push at 0.7 MPa, with a theoretical maximum of 32 kgf at 1.0 MPa. The male rod thread (B code) bolts straight to tooling, and the fitted -S magnet lets CMSE or DMSE switches report end positions.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into slim fixtures where a full-length body will not fit. In practice, plan on roughly 94 N (about 9.6 kgf) of real work at 0.5 MPa, which corresponds to lifting about 8 kg vertically with a 2:1 margin. A hard-anodized aluminium body, S45C hard-chrome rod, fixed TPU bumpers at both ends and a 30-500 mm/s speed range round out the spec.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30SB |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 55 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 ACEJ20X55-30SB
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×55 | 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 ACEJ20X55-30SB Is Used
Fixture clamping
Trims 25-55 mm to clamp small machined aluminium brackets on a CNC fixture, using about 94 N of usable force at 0.5 MPa.
Packaging push-off
Pushes cartons or blister packs off a conveyor lane; the fitted magnet and a CMSE switch confirm each stroke is complete.
Lab dosing slide
Indexes a small dosing or sample slide in test rigs where the short ISO 21287 body fits inside a compact guard.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X55-30SB the Right Cylinder?
Size both ways before committing: the 16 mm bore gives 100.5 N push at 0.5 MPa, while stepping up to the 25 mm bore raises it to 245.4 N, so this 20 mm model sits mid-range for light clamping and indexing. Remember the stop screw is a mechanical end stop only - on air loss the rod still drifts, so do not treat it as a load-holding lock. FA flange or LB foot mountings and the optional -S magnet (fitted on this model) for CMSE / DMSE switches complete the package.
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 ACEJ20X55-30SB FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa push is 219.9 N. Theoretical maximum is 32 kgf at 1.0 MPa. The ordered stroke is 55 mm with a 30 mm adjustment window, so the extend stroke can be trimmed anywhere from 25 to 55 mm by the external stop screw. Operating pressure is 0.15-1.0 MPa (22-145 psi) and speed is 30-500 mm/s.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and a fixed TPU bumper at each end absorbs end-of-stroke energy. This model carries the optional -S magnet, so CMSE or DMSE reed or solid-state switches can be mounted in the body slots. FA flange and LB foot mountings bolt to the standard ISO 21287 face, and the B code gives a male rod thread for direct tooling attachment.
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 ACEJ20X55-30SB
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.