Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 50mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke50 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB
The AirTAC ACQJ125X50-40SB is a double-acting, big-bore JIS compact cylinder engineered with an external extend stop. A threaded M27x2.0 adjuster and lock nut let you fine-tune the extend end position on the machine, yielding a usable extend range of 10-50 mm. Because the piston area remains constant, the output force is identical to a standard ACQ of this bore, delivering 6135.9 N push at 0.5 MPa. The retract stroke remains completely unaffected.
This model includes a built-in piston magnet for use with reed or electronic solid-state switches, and features a male M30x1.5 piston rod end that couples directly to your load. Deceleration is handled by a fixed NBR elastomer bumper at each end rather than an adjustable air cushion. For high kinetic energy loads, adding an external shock absorber or slowing the approach speed is advised.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 50 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 ACQJ125X50-40SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 ACQJ125X50-40SB Is Used
Press Tooling Changeovers
Swap stamping or forming dies on a large press and dial in the exact 10-50 mm extend stop without machining new spacers or swapping cylinders.
Heavy Fixture Positioning
Adjust the end-of-stroke contact point on oversized welding fixtures to accommodate different sub-assembly widths directly on the plant floor.
Large Container Flap Folding
Tune the folding arm stroke on industrial corrugated box erecting machinery to handle varying pallet carton heights on the fly.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB the Right Cylinder?
When sizing this 125 mm bore unit, stepping down to an ACQJ100 yields 3927.0 N push at 0.5 MPa, while stepping up to the ACQJ140 provides 7696.9 N push. If the exact extend position never varies between product runs, a fixed-stroke ACQ cylinder is simpler and suffices. To order this adjustable variant correctly, confirm the 125 mm bore, 50 mm full stroke, 40 mm adjustable window, the -S magnet, and the -B male 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 ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-40SB FAQ
It delivers 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 50 mm with a 40 mm adjustable window, giving a usable extend range of 10-50 mm. The port is PT3/8, the male rod thread is M30x1.5, and the external adjuster thread is M27x2.0.
No, the adjuster only changes the extend stroke length, not the piston area, so force remains identical to a standard ACQ. Deceleration is handled by a fixed NBR elastomer bumper at each end. Note that a plain cylinder does not hold its load on air loss; for a fail-safe hold, use an external rod lock or pilot-operated check valve.
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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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