Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20S
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20S 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 ACQJ125X75-20S
The AirTAC ACQJ125X75-20S is a big-bore JIS compact pneumatic cylinder with a 125mm bore and a 75mm full stroke. It features an external M27x2.0 threaded stop with a lock nut on the rod-end side that limits the extend travel. You can fine-tune the extend end position on the machine, creating a usable extend range of 55-75mm. The retract stroke remains unaffected by this adjustment.
Because the adjuster 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 body uses fixed elastomer NBR bumpers at both ends for end-of-stroke deceleration rather than adjustable air cushions. The -S suffix indicates a built-in piston magnet compatible with reed or solid-state electronic switches.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20S Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20S |
|---|---|
| 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 ACQJ125X75-20S
| 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 ACQJ125X75-20S Is Used
Heavy Press Tonnage Setup
Dial in the exact extend position during heavy press tooling setup without machining custom spacers, adjusting the stroke down from 75mm to 55mm as needed for different material thicknesses.
Automotive Component Forming
Accommodate trial end positions on metal forming machines, where the external stop allows operators to tweak the extend reach on the fly for varying stamping depths.
Large Fixture Changeover
Speed up product-changeover stops on large welding fixtures by turning the M27x2.0 adjuster nut to shift the extend end position for new part geometries.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X75-20S the Right Cylinder?
Selecting this 125mm bore model provides 6135.9 N push at 0.5 MPa, sitting below the 160mm bore (10053.1 N) and above the 140mm bore (7696.9 N) in the big-bore compact range. If your machine requires a fixed 75mm extend position every cycle without variation, a standard ACQ cylinder will suffice without the external adjuster hardware. When ordering this adjustable version, confirm the 75mm full stroke, the 20mm window, the -S magnet option, and the default female M22x2.5 rod-end thread. Keep in mind a plain ACQ-type cylinder will not hold its load on air loss; the rod drifts and the fixed bumper only decelerates near the stroke end, so utilize an external rod lock or pilot-operated check valve 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 ACQJ125X75-20S FAQ
This 125mm bore cylinder generates 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 75mm with a 20mm adjustable window, yielding a usable extend range of 55-75mm.
The external M27x2.0 threaded stop with a lock nut mechanically limits the extend travel, allowing on-machine tuning without changing parts. It does not alter the piston area, so force remains identical to a standard ACQ. Deceleration is handled by fixed elastomer NBR bumpers at both ends, not adjustable air cushions.
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