Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40SB 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 ACQJ20X40-40SB
The AirTAC ACQJ20X40-40SB is a double-acting JIS compact cylinder with a 40mm full stroke and an external extend stop. By turning the M8x1.25 adjuster screw and locking the nut, you set the extend end position anywhere from 0 to 40mm. The retract stroke remains completely unaffected. Because the piston area stays the same, output force equals a standard ACQ, delivering 157.1N push at 0.5MPa.
This bore 20mm unit features a 10mm rod with a male M8x1.25 thread (-B) for direct load coupling. It includes a piston magnet (-S) compatible with reed or solid-state switches, fitting into the integrated sensor grooves. Deceleration relies on fixed elastomer bumpers at both ends rather than adjustable air cushions.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40SB |
|---|---|
| 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 ACQJ20X40-40SB
| 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 ACQJ20X40-40SB Is Used
Tooling Depth Calibration
Dial in the exact clamping depth on machining fixtures by adjusting the extend stop, preventing part deformation without swapping mechanical spacers.
Rapid Product Changeover
Switch between varying product sizes on a packaging line by rotating the external stopper nut to match the new required extend position quickly.
Prototype End-Position Testing
Safely trial different extend endpoints on automated assembly rigs, finding the optimal reach before committing to a hard-machined fixed stroke.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-40SB the Right Cylinder?
If your application only needs a fixed 40mm extend, a standard ACQ20X40 is sufficient. For applications needing end-position tuning, this ACQJ20X40-40SB provides a 0-40mm usable extend range. If you need less push force, the bore 12 version provides 56.5N at 0.5MPa; if you need more, the bore 25 model offers 245.4N. When ordering, confirm the 20mm bore, 40mm full stroke, 40mm window, the male rod thread, and the magnet option.
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 ACQJ20X40-40SB FAQ
The usable extend range is 0-40mm. It delivers a push force of 157.1N and pull of 117.8N at 0.5MPa, 219.9N push at 0.7MPa, and a maximum push of 32kgf at 1.0MPa. The force is identical to a standard ACQ because the adjuster only changes stroke length.
An external M8x1.25 threaded stop with a lock nut limits the extend stroke, while the retract stroke remains unaffected. The cylinder uses fixed elastomer bumpers for end deceleration. It does not hold its load on air loss; for fail-safe holding, use an external rod lock or pilot-operated check valve.
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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.
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Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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