Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40S
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40S 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 ACQJ20X40-40S
The AirTAC ACQJ20X40-40S is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend end position. You can fine-tune the usable extend range from 0 mm up to the full 40 mm directly on the machine. The retract stroke remains unaffected by this adjustment.
Because the piston area stays the same, output force is identical to a standard ACQ of this bore, delivering 157.1 N push at 0.5 MPa. The unit features a 10 mm rod, an M5x0.8 port, fixed elastomer bumpers, and a built-in magnet for position sensing.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40S Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40S |
|---|---|
| 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 ACQJ20X40-40S
| 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 ACQJ20X40-40S Is Used
Milling Fixture Stops
Dial in the exact extend end position for varying raw material lengths on a CNC milling fixture without swapping hardware.
Carton Changeover
Adjust the extend stroke rapidly during packaging line format changeovers to accommodate different box dimensions.
Lab Test Probes
Set precise trial end positions for contact probes on automated laboratory testing equipment.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40S the Right Cylinder?
When sizing this 20 mm bore actuator, dropping down to a 16 mm bore yields 100.5 N push, while stepping up to 25 mm provides 245.4 N at 0.5 MPa. If your extend end position never varies, a fixed-stroke ACQ cylinder is sufficient. To order this adjustable version correctly, confirm the 20 mm bore, 40 mm full stroke, 40 mm window, the -S magnet, and the female M5x0.8 rod-end 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 ACQJ20X40-40S FAQ
The usable extend range is 0-40 mm. Force is identical to a standard ACQ: push 157.1 N and pull 117.8 N at 0.5 MPa, push 219.9 N at 0.7 MPa, with a max push of 32 kgf at 1.0 MPa. The window is 40 mm.
An external M8x1.25 threaded stop with a lock nut limits the extend stroke, while the retract stroke is unaffected. Force is unchanged because the piston area remains the same. The cylinder uses fixed elastomer bumpers, not adjustable air cushions. The -S 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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