Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 300mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke300 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB
The ACQJ125X300-20SB is a double-acting, single-rod JIS compact cylinder from AirTAC's big-bore range, featuring a 300 mm full stroke and an external mechanical extend stop. A threaded rod with an M27x2.0 adjuster and lock nut lets you shorten the forward travel by up to 20 mm, yielding a usable extend span of 280-300 mm. The return stroke remains completely unaffected by this modification.
Because the internal piston area is unchanged, output force equals a standard ACQ of identical size, delivering 6135.9 N push and 5733.8 N pull at 0.5 MPa. This variant includes a built-in magnet for electronic or reed switches and a male M30x1.5 piston rod end for direct load coupling. Deceleration relies on fixed NBR elastomer bumpers at both ends rather than adjustable air cushions.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 300 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 ACQJ125X300-20SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 ACQJ125X300-20SB Is Used
Heavy Press Tonnage Calibration
Dial in the exact 280-300 mm extend position during press tooling setup to accommodate varying material thicknesses without machining custom spacers.
Large Assembly Fixture Changeover
Adapt heavy-duty automated assembly lines for new product dimensions by turning the external M27x2.0 stopper to meet new part heights.
Woodworking Clamp Depth Proving
Test and prove final clamping reach on large woodworking machinery, safely tuning the forward stop before committing to a fixed production stroke.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-20SB the Right Cylinder?
Choosing this 125 mm bore provides a maximum push of 1251 kgf at 1.0 MPa. If your setup requires slightly less thrust, the neighbouring 100 mm bore yields 3927.0 N push at 0.5 MPa, whereas the larger 140 mm bore offers 7696.9 N push. Opt for a fixed-stroke ACQ if end-position tuning is unnecessary. To order, confirm the 125 mm bore, 300 mm full stroke, 20 mm window, S magnet, B male rod thread, and PT3/8 port.
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 ACQJ125X300-20SB 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 usable extend range is 280-300 mm, achieved by shortening the 300 mm full stroke via the 20 mm window. Retract travel stays fixed.
An external threaded stop with a lock nut physically limits how far the rod extends, shortening the stroke without altering piston area, so force remains identical to a standard ACQ. Fixed NBR bumpers decelerate the load near stroke end. This cylinder does not hold its load on air loss; use an external rod lock or pilot-operated check valve for fail-safe holding.
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Related AirTAC ACQJ Compact Cylinders
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