Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20SB
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20SB 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 ACEJ20X45-20SB
The ACEJ20X45-20SB is a double acting AirTAC compact cylinder to ISO 21287, with a 20 mm bore and a 45 mm stroke that an external stop screw trims anywhere in a 20 mm window, giving a usable extend range of 25-45 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N on the extend stroke at 0.7 MPa. The male rod thread (B code) bolts straight into standard tooling, and the fitted -S magnet carries CMSE / DMSE switches for end-of-stroke sensing.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight fixtures, guards and sliding gates. A hard-anodized aluminium body with an S45C hard-chrome plated 10 mm rod resists wear, and fixed TPU bumpers at both ends absorb end-of-stroke shock. For sizing, 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. Operating range is 0.15-1.0 MPa (22-145 psi), speed 30-500 mm/s, air filtered to 40 um.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20SB Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20SB |
|---|---|
| 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 ACEJ20X45-20SB
| 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 ACEJ20X45-20SB Is Used
Fixture clamping on CNC jigs
The 25-45 mm trimmed extend range clamps small aluminium or plastic workpieces in machining jigs, with about 94 N of usable clamp force at 0.5 MPa and CMSE switch confirmation via the fitted magnet.
Gate diverting on packaging lines
Its short body, about 50% shorter in mounting length than an ISO 15552 profile cylinder, fits between conveyor frames to push cartons off a lane at 30-500 mm/s.
Sample press in lab automation
The male-threaded 10 mm rod and 219.9 N push at 0.7 MPa seat vials or microplate lids in compact diagnostic instruments where space is scarce.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X45-20SB the Right Cylinder?
At 157.1 N push at 0.5 MPa this 20 mm bore sits between the 16 mm bore (100.5 N) and the 25 mm bore (245.4 N); step down for lighter pick-and-place, step up if your tooling mass or friction load approaches the 94 N working figure. The stop screw only shortens the extend stroke and is a mechanical end stop, not a mid-stroke lock, so the rod will drift if air is lost. FA flange, LB foot and I/Y rod knuckles mount on the ISO 21287 face; PT ports, male rod thread, and CMSE / DMSE switches work because this model carries the optional -S magnet.
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 ACEJ20X45-20SB 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 the theoretical maximum is 32 kgf at 1.0 MPa. The 45 mm extend stroke is adjustable down to 25 mm via the external stop screw (20 mm window). It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), -20 to +70 C, speed 30-500 mm/s, with a 10 mm male-thread rod and M5x0.8 ports.
The ISO 21287 short body saves about 50% of the mounting length of an ISO 15552 profile cylinder, and FA flange, LB foot and I/Y knuckle hardware bolt to its standard face. Fixed TPU bumpers at both ends absorb end-of-stroke impact. This model carries the optional -S magnet, so CMSE / DMSE reed or solid-state switches can be clipped into the body slots for end-of-stroke detection.
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