Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 40mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke40 mm
- Port sizeM5×0.8
- Adjuster threadM8×1.25
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S
The AirTAC ACQJ20X40-20S is a double-acting JIS compact cylinder with an external extend stop, letting you fine-tune the forward end position directly on your equipment. It provides a usable extend range of 20 to 40 mm by shortening the 40 mm full stroke up to a 20 mm window. The return stroke remains completely unaffected.
Output force mirrors a standard ACQ bore, delivering 157.1 N push and 117.8 N pull at 0.5 MPa. It features a 10 mm piston rod, an M5x0.8 port, and fixed elastomer bumpers for end-of-stroke deceleration. The built-in magnet (-S) supports both reed and solid-state sensors.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 40 mm |
| Adjuster thread | M8×1.25 |
| Port size | M5×0.8 |
| 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 |
| Rod thread | M5×0.8 (F) / M8×1.25 (B) |
Specifications follow the official AirTAC ACQJ datasheet. The adjustable stop shortens the EXTEND stroke only; the piston area — and therefore the force — is the same as a standard ACQ of this bore. Adjustable window options: 10/20/30/40/50/75/100 mm.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 kgf | |
Force equals a standard ACQ of the same bore — the adjuster changes stroke length, not piston area. Actual usable force is lower due to friction; size with a safety margin.
Model Code: Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×40 | Full stroke length in mm. |
| -0 | Adjustable window in mm (extend stroke can be shortened by up to this). |
| S / B | Magnet (S) / male-thread rod (B); omit for none / female thread. |
Thread: PT standard (G / NPT available). Related: ACQ (fixed stroke), ACQD (double rod), TACQ (guided / non-rotating).
Where the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S Is Used
Gauge Calibration Stands
Dial in the exact 20 to 40 mm contact distance during testing equipment setup without machining custom spacers.
Product Changeover Stops
Swiftly reposition the extend end stop on a packaging line when switching between different carton sizes.
Prototype End Positions
Trial different extension lengths on a CNC loader to find the optimal feed location before finalizing the design.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S the Right Cylinder?
If you need less push power, the 16 mm bore yields 100.5 N at 0.5 MPa, whereas stepping up to the 25 mm bore provides 245.4 N for heavier mechanisms. A fixed-stroke ACQ20 is sufficient if your extension target never varies. When ordering this adjustable unit, confirm the 20 mm bore, 40 mm full stroke, 20 mm window, magnet option, and female M5x0.8 rod thread.
Quick checklist
- ✓ Need on-machine end-position tuning?
- ✓ Full stroke and adjust window (mm)
- ✓ Force at your working pressure
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Lock the adjuster nut after setting the stop.
- check The stop limits the EXTEND stroke only.
- check Avoid side load on the short piston rod.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20S FAQ
It delivers 157.1 N push and 117.8 N pull at 0.5 MPa, 219.9 N push at 0.7 MPa, and a maximum push of 32 kgf at 1.0 MPa. The usable extend range is 20 to 40 mm, set via a 20 mm adjustment window.
An M8x1.25 threaded stop with a lock nut limits the forward stroke length only, meaning force is identical to a standard ACQ. Retract stroke is unaffected, and the fixed elastomer bumper decelerates the load. The included magnet works with reed or electronic switches.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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