Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 250mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke250 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S
The AirTAC ACQJ125X250-40S is a double-acting JIS compact cylinder from the big-bore range, featuring a 125 mm bore and a 250 mm full stroke. An external M27x2.0 threaded stop with a lock nut limits the extend end position, providing a usable extension range of 210 to 250 mm without changing parts. The retract stroke remains completely unaffected by this adjustment.
Because the piston area is unchanged, the output force equals a standard ACQ of this size, delivering 6135.9 N push and 5733.8 N pull at 0.5 MPa. The unit includes a fixed NBR elastomer bumper at each end for end-of-stroke deceleration and a built-in piston magnet for position sensing. Operating pressure spans 0.15 to 1.0 MPa, and the PT3/8 port ensures adequate airflow for heavy-duty cycles.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 250 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 ACQJ125X250-40S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 ACQJ125X250-40S Is Used
Press Tool Changeovers
Dial in the exact 210 to 250 mm extension on heavy press fixtures during product family transitions without machining new stop collars.
Automotive Welding Stops
Tune the extend position of large welding gun actuators on the fly to accommodate varying sheet metal thicknesses and panel geometries.
Bending Machine Setup
Establish precise trial end positions for heavy-gauge metal forming without swapping out the entire cylinder body or hard stops.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-40S the Right Cylinder?
This 125 mm bore actuator provides 6135.9 N push force at 0.5 MPa. Stepping down to a 100 mm bore yields 3927.0 N push, whereas stepping up to a 140 mm bore provides 7696.9 N push. Select this adjustable model when prototype end positions or product-changeover stops require frequent on-machine tuning; if the extension length is permanently fixed, a standard ACQ cylinder suffices. Confirm the 250 mm full stroke, the 40 mm adjuster window, the -S magnet for electronic or reed switches, and the default female M22x2.5 rod-end thread when ordering.
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 ACQJ125X250-40S FAQ
At 0.5 MPa the push force is 6135.9 N and the pull force is 5733.8 N. At 0.7 MPa the push force is 8590.3 N, and the maximum push at 1.0 MPa is 1251 kgf. The full stroke is 250 mm with a 40 mm adjustment window, yielding a usable extend range of 210 to 250 mm. The external adjuster uses an M27x2.0 thread.
The external threaded stop limits the extend stroke length only; it does not change the piston area, so the output force remains identical to a standard ACQ of the same bore. Deceleration is provided by a fixed NBR elastomer bumper at each end, not an adjustable air cushion. For high kinetic energy loads, add an external shock absorber or reduce the approach speed. Note that a plain compact cylinder does not hold its load on air loss; use an external rod lock 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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