Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 40mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke40 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S
The AirTAC ACQJ125X40-20S is a double-acting, single-rod JIS compact cylinder from the big-bore range, featuring an external threaded stop with a lock nut to limit the extend end position. You can fine-tune the usable extend travel anywhere from 20 mm up to the full 40 mm directly on your machinery, meaning the retract stroke remains totally unaffected. Featuring a 32 mm piston rod and a PT3/8 port, this unit delivers a push force of 6135.9 N at 0.5 MPa.
Because the internal piston area stays constant, output force is identical to a standard ACQ of this bore; the adjuster changes stroke length only. The unit incorporates fixed NBR elastomer bumpers at both ends for end-of-travel deceleration rather than adjustable air cushions. Equipped with a magnet (-S), the sensor grooves accept both reed and solid-state electronic switches for precise position detection.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 40 mm |
| Adjuster thread | M27×2.0 |
| Port size | PT3/8 |
| 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 | M22×2.5 (F) / M30×1.5 (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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | 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 ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S Is Used
Heavy Press Tonnage Setup
Dial in the exact 20-40 mm extend reach on heavy stamping presses during initial tool setup, preventing over-travel without machining custom spacers.
Automated Welding Changeover
Shift the extend end-stop rapidly when swapping welding fixtures on an automotive line, accommodating different part heights without replacing the actuator.
Bending Machine Trial Positions
Establish the precise end position for material forming on a bending machine, testing multiple stroke lengths on the fly to find the optimal bend angle.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S the Right Cylinder?
When sizing this big-bore 125 mm unit, stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927.0 N, whereas stepping up to a 140 mm bore raises it to 7696.9 N. If your application never requires altering the extend end-point, a fixed-stroke ACQ cylinder provides the same power in a simpler package. To order, confirm the 125 mm bore, 40 mm full stroke, 20 mm adjustable window, the -S magnet requirement, and the default female M22x2.5 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 ACQJ125~160 Adjustable Compact Cylinder ACQJ125X40-20S FAQ
It provides 6135.9 N push and 5733.8 N pull at 0.5 MPa, 8590.3 N push at 0.7 MPa, and a maximum push of 1251 kgf at 1.0 MPa. The full stroke is 40 mm with a 20 mm adjustable window, yielding a usable extend range of 20-40 mm. The retract stroke is unaffected.
An external M27x2.0 threaded stop with a lock nut mechanically limits how far the rod extends. It changes stroke length only, so force remains identical to a standard ACQ. Deceleration is handled by fixed elastomer bumpers, not adjustable air cushions. Note that a plain compact cylinder does not hold its load on air loss; use an external rod lock or pilot-operated check valve for fail-safe holding.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Related AirTAC ACQJ Compact Cylinders
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