Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20SB 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 ACQJ125X50-20SB
The ACQJ125X50-20SB is a double-acting JIS compact cylinder featuring a big-bore 125mm piston and an external extend-stop mechanism. A threaded stop with a lock nut lets you limit the outward stroke, providing a usable extension range of 30 to 50 mm. The inward stroke remains completely unaffected. Because the internal piston area stays constant, output force is identical to a standard ACQ of this size.
This variant includes a male piston rod thread (M30x1.5) for direct load coupling and a built-in magnet (-S) for position sensing. It retains the fixed elastomer bumper design rather than an adjustable air cushion. Operating pressure spans 0.15-1.0 MPa, and the PT3/8 port handles the required air volume for this large-capacity actuator.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20SB |
|---|---|
| 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 ACQJ125X50-20SB
| 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 ACQJ125X50-20SB Is Used
Heavy Press Tonnage Setup
Dial in the exact 30 to 50mm clamp reach on a large metal-forming press during initial tooling setup, preventing over-travel damage to expensive dies.
Automated Welding Changeover
Shift the gun extension point rapidly when switching between automotive chassis sub-assemblies, using the external M27x2.0 stop to set new electrode contact depths.
Palletizer Stroke Tuning
Modify the downward push distance for varying pallet heights without swapping out actuators, relying on the 125mm bore's 1251 kgf maximum thrust to seat heavy cartons.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X50-20SB the Right Cylinder?
When sizing this big-bore actuator, note that the 125mm bore delivers 6135.9 N of push force at 0.5 MPa. If your application requires less thrust, stepping down to a 100mm bore yields 3927.0 N, whereas the next size up (140mm) provides 7696.9 N. If your end-position never varies, a fixed-stroke ACQ cylinder is sufficient. To order this adjustable version correctly, confirm the 50mm full stroke, the 20mm adjustment 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 ACQJ125X50-20SB FAQ
This cylinder 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 20mm adjustment window allows a usable extend range of 30-50 mm.
The external stop alters only the extension length, not the piston area, so force remains identical to a standard ACQ. The -S magnet works with reed or solid-state switches, and the fixed NBR bumper decelerates the rod near stroke ends. A plain ACQ-type does not hold its load on air loss, so for a fail-safe hold you need an external rod lock or pilot-operated check valve.
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Related AirTAC ACQJ Compact Cylinders
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