Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 250mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke250 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB
The AirTAC ACQJ125X250-20SB is a double-acting JIS compact cylinder from the big-bore range, featuring an external extend-stroke adjuster. A threaded stop with a lock nut lets you set the extend end position anywhere from 230 mm up to the full 250 mm directly on the machine. The retract stroke remains completely unaffected by this mechanism.
Because the piston area is unchanged, output force is identical to a standard ACQ of this bore, delivering 6135.9 N push at 0.5 MPa. This variant includes a built-in piston magnet for electronic or reed switches and a male M30x1.5 piston rod end that couples directly to the load. Deceleration is handled by a fixed NBR elastomer bumper at each end, not an adjustable air cushion, so external shock absorbers are recommended for high-energy loads.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 250 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 ACQJ125X250-20SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 ACQJ125X250-20SB Is Used
Press Tool Changeovers
Adapt forming depths rapidly during product family changeovers on large stamping presses by dialing the extend stop back by up to 20 mm.
Heavy Fixture Positioning
Establish trial end positions for large machining fixtures without machining new spacer blocks, using the lock nut to secure the exact 230 mm to 250 mm travel.
Pallet Lift Stops
Fine-tune the raise height of heavy pallet lifts in packaging lines, ensuring precise leveling while the unaffected retract stroke maintains a fast cycle.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X250-20SB the Right Cylinder?
When sizing this big-bore 125 mm unit, consider the adjacent bore options: an ACQJ100 provides 3927.0 N push, while an ACQJ140 offers 7696.9 N, both evaluated at 0.5 MPa. If your equipment requires a fixed 250 mm extend position without on-machine tuning, a standard ACQ cylinder will suffice. To order this adjustable model correctly, confirm the 125 mm bore, 250 mm full stroke, 20 mm window, the -S magnet requirement, and the -B male rod thread. Note that a plain compact cylinder will drift and lose its load on air loss, so specify 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 ACQJ125X250-20SB FAQ
The usable extend range is 230-250 mm (250 mm full stroke minus the 20 mm window). Force matches a standard ACQ: 6135.9 N push and 5733.8 N pull at 0.5 MPa, 8590.3 N push at 0.7 MPa, with a maximum push of 1251 kgf at 1.0 MPa. The port is PT3/8, the male rod thread is M30x1.5, and the external adjuster thread is M27x2.0.
No, the adjuster only changes the extend stroke length by limiting how far the rod extends; the piston area and force remain identical to a standard ACQ. The retract stroke is entirely unaffected. Deceleration relies on a fixed NBR elastomer bumper at each end, not an adjustable air cushion, so you should slow the approach or add external shock absorbers for high kinetic energy loads. The -S magnet works with reed or solid-state switches.
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Related AirTAC ACQJ Compact Cylinders
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