Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30S
The AirTAC Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30S is a genuine double acting, adjustable stroke ISO 21287 compact air cylinder with a Ø20mm bore and 70mm 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
- Stroke70 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 ACEJ20X70-30S
The ACEJ20X70-30S is a double acting ISO 21287 compact cylinder with a 20 mm bore and a 70 mm stroke that an external stop screw trims on site: the -30 code gives a 30 mm window, so the usable extend range is 40-70 mm. At 0.5 MPa it pushes 157.1 N and pulls 117.8 N, rising to 219.9 N at 0.7 MPa. A practical rule of thumb is that about 0.6 of the push force does real work, so plan on roughly 94 N, which lifts about 8 kg vertically with a 2:1 margin.
The short ISO 21287 body saves about 50% of the mounting length of an ISO 15552 profile cylinder, so it slots into tight jigs and guarded cells. The hard-anodized aluminium body carries an S45C hard-chrome rod, a fixed TPU bumper at each end, and the -S magnet this model carries lets CMSE / DMSE reed or solid-state switches report end positions. It runs on air filtered to 40 um at 0.15-1.0 MPa (22-145 psi), 30-500 mm/s, from -20 to +70 C.
Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30S Technical Specifications
| Model | Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30S |
|---|---|
| Series | ACEJ compact cylinder |
| Standard | ISO 21287 |
| Bore size | Ø20 mm |
| Stroke | 70 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 ACEJ20X70-30S
| ACEJ | ISO 21287 compact cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 ACEJ20X70-30S Is Used
Fixture clamping on small machining centres
The 40-70 mm trim range lets one cylinder serve several part heights on a jig, with about 94 N of usable clamp force at 0.5 MPa for light aluminium brackets.
Position feedback on an electronics assembly bench
With the fitted -S magnet, CMSE or DMSE switches confirm part presence at each trimmed end position, and the compact body fits under a low bench frame.
Ejecting small parts from a packaging chute
The 70 mm stroke clears a 60 mm chute pocket, and the 8 kg vertical-lift equivalent covers pushing blister packs sideways at 30-500 mm/s.
Is the Airtac ACEJ12 Adjustable Compact Cylinder ACEJ20X70-30S the Right Cylinder?
Size down to the ACEJ16 (100.5 N push at 0.5 MPa) if the load is light, or up to the ACEJ25 (245.4 N push) when this 20 mm bore's 157.1 N is marginal. Remember the stop screw is a mechanical end stop only: on air loss the piston still drifts, so it never holds a load mid-stroke. FA flange, LB foot and FTC brackets plus I/Y rod knuckles bolt to the ISO 21287 face, and the female M6x1.0 rod thread suits standard rod accessories.
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 ACEJ20X70-30S FAQ
At 0.5 MPa it pushes 157.1 N and pulls 117.8 N; at 0.7 MPa it pushes 219.9 N and pulls 164.9 N. 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 the extend stroke is adjustable anywhere in the 40-70 mm window.
An external stop screw shortens the 70 mm extend stroke by up to 30 mm, giving a 40-70 mm range; it is an end stop, not a mid-stroke lock. This model carries the optional -S magnet, so CMSE / DMSE switches can be clipped into the body slots. The fixed TPU bumpers decelerate at both ends, and the ISO 21287 body accepts FA/LB/FTC mounting hardware.
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 ACEJ20X70-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.