Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20S
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20S 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 ACQJ125X50-20S
The AirTAC ACQJ125X50-20S is a double-acting, single-rod JIS compact cylinder featuring an external extend-stop mechanism. A threaded rod-end adjuster with a lock nut allows you to fine-tune the extend end position directly on the equipment, providing a usable extend range of 30-50 mm from the 50 mm full stroke. The retract stroke remains completely unaffected by this adjustment.
Because the piston area is unchanged, the output force is identical to a standard ACQ of this bore, delivering 6135.9 N push and 5733.8 N pull at 0.5 MPa. This big-bore compact cylinder uses a PT3/8 port, a 32 mm piston rod with an M22x2.5 female thread, and includes a fixed NBR elastomer bumper at each end for end-of-stroke deceleration. The built-in piston magnet (-S) supports both reed and electronic solid-state switches.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20S Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20S |
|---|---|
| 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 ACQJ125X50-20S
| 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 ACQJ125X50-20S Is Used
Heavy Press Tonnage Setup
Dial in the exact extend position on a 125 mm press fixture during trial runs, shortening the stroke by up to 20 mm to accommodate varying material thicknesses without machining new spacers.
Automotive Welding Line Changeover
Adjust the extend stop on a large robotic welding clamp during product changeover, shifting the 50 mm stroke down to 30 mm to reach a new panel geometry rapidly.
Bending Machine Trial Stops
Set precise end positions on a heavy-duty bending fixture, utilizing the M27x2.0 external adjuster to test multiple extend depths before locking the final 45 mm position.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20S the Right Cylinder?
When sizing this big-bore compact cylinder, note that the 125 mm bore generates 6135.9 N push force at 0.5 MPa. If your application requires less force, stepping down to the 100 mm bore yields 3927.0 N push, while moving up to the 140 mm bore provides 7696.9 N. A fixed-stroke ACQ is sufficient if your extend position never varies, but choose this ACQJ variant when you need on-machine end-position tuning without swapping parts. Confirm your ordering essentials: 125 mm bore, 50 mm full stroke, 20 mm adjuster window, -S magnet, and female 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 ACQJ125X50-20S FAQ
The push force is 6135.9 N and pull is 5733.8 N at 0.5 MPa, with a push of 8590.3 N at 0.7 MPa, and a maximum push of 1251 kgf at 1.0 MPa. The 50 mm full stroke has a 20 mm adjustable window, giving a usable extend range of 30-50 mm.
An external M27x2.0 threaded stop with a lock nut limits the extend stroke without changing the piston area, so force remains identical to a standard ACQ. The cylinder uses fixed elastomer bumpers for deceleration, but a plain ACQ will drift on air loss, so an external rod lock or pilot-operated check valve is required for fail-safe load holding.
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