Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 75mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke75 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB
The AirTAC ACQJ125X75-20SB is a double-acting JIS compact cylinder featuring a 125mm bore and a 75mm full stroke. Equipped with a male piston rod thread (M30x1.5), it couples directly to your load. An external threaded stop with a lock nut limits the extend end position, providing a usable extend range of 55-75mm. The retract stroke remains completely unaffected by this adjustment.
Because the adjustment only alters travel length and not the piston area, the output force is identical to a standard ACQ of this size. At 0.5 MPa, it delivers 6135.9 N of push force and 5733.8 N of pull force. The cylinder relies on a fixed NBR elastomer bumper at each end for deceleration and includes a built-in piston magnet (-S) compatible with reed or solid-state switches. Operating pressure spans 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 75 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 ACQJ125X75-20SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 ACQJ125X75-20SB Is Used
Heavy Press Tonnage Setup
Dial in the exact 55 to 75mm extend position during heavy press changeovers without machining new spacers or swapping cylinders.
Automotive Welding Fixtures
Adapt clamp reach on the fly for different vehicle body panels, using the external M27x2.0 stopper to tune the extended endpoint.
Large Pallet Forming Stops
Modify the pusher end position for varying pallet sizes, relying on the fixed NBR bumper to absorb the 30-500 mm/s travel energy.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20SB the Right Cylinder?
When sizing this big-bore compact unit, consider the adjacent standard bores. Dropping down to a 100mm bore yields 3927.0 N push at 0.5 MPa, while stepping up to a 140mm bore provides 7696.9 N push at 0.5 MPa. If your end position never varies, a fixed-stroke ACQ cylinder is sufficient. To order this adjustable version correctly, confirm the 125mm bore, 75mm full stroke, 20mm window, the -S magnet, and the -B male rod thread. Keep in mind a plain ACQ-type cylinder will not hold a load on air loss; the rod drifts, so add an external rod lock for fail-safe holding.
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 ACQJ125X75-20SB FAQ
This 125mm bore cylinder has a 75mm full stroke with a 20mm adjustment window, giving a usable extend range of 55-75mm. Force is identical to a standard ACQ: 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 port size is PT3/8.
An external M27x2.0 threaded stop with a lock nut limits the extend stroke, allowing on-machine endpoint tuning without changing parts. The piston area is unchanged, so force is not reduced. The cylinder uses fixed elastomer bumpers, not an adjustable air cushion. Note that a plain ACQ-type does not hold its load on air loss; the rod drifts, requiring an external rod lock for fail-safe holding.
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Related AirTAC ACQJ Compact Cylinders
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