Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-40SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-40SB 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 ACQJ125X300-40SB
The ACQJ125X300-40SB is a double-acting JIS compact cylinder featuring a 125mm bore and a 300mm full stroke. An external threaded stop with a lock nut limits the extend end position, giving a usable forward range of 260 to 300mm. The retract stroke remains completely unaffected by this adjustment. Because the piston area is unchanged, force output equals a standard ACQ of identical bore: 6135.9N push and 5733.8N pull at 0.5MPa.
This big-bore variant includes a male M30x1.5 piston rod end for direct load coupling, a built-in piston magnet for electronic or reed switches, and PT3/8 ports. It relies on a fixed NBR elastomer bumper at each end for deceleration rather than an adjustable air cushion. Operating pressure spans 0.15 to 1.0MPa, with a maximum push capacity of 1251kgf at 1.0MPa.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-40SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-40SB |
|---|---|
| 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 ACQJ125X300-40SB
| 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 ACQJ125X300-40SB Is Used
Heavy Press Tonnage
Dial in the exact 260-300mm extend position during product changeover on a large pneumatic press without machining new spacers.
Large Fixture Clamping
Fine-tune clamping reach on oversized welding fixtures, accommodating varying part thicknesses directly on the machine floor.
Material Lift Stops
Set precise lift heights for heavy material handling elevators, adjusting the stop to test trial end positions before final lock-down.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X300-40SB the Right Cylinder?
Selecting this 125mm bore provides 6135.9N push force at 0.5MPa. Dropping to a 100mm bore lowers push to 3927N, while stepping up to a 140mm bore increases it to 7696.9N. A fixed-stroke ACQ is sufficient if your end position never requires tweaking. Confirm your ordering essentials: 125mm bore, 300mm full stroke, 40mm window, magnet S, and male B 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 ACQJ125X300-40SB FAQ
At 0.5MPa, push force is 6135.9N and pull is 5733.8N; at 0.7MPa push is 8590.3N. Maximum push is 1251kgf at 1.0MPa. The full stroke is 300mm, the adjustable window is 40mm, and the usable extend range is 260-300mm. The external adjuster has an M27x2.0 thread.
No, the adjuster changes stroke length only, leaving force identical to a standard ACQ. Deceleration relies on a fixed NBR elastomer bumper at each end, not an adjustable air cushion. Note that a plain compact cylinder drifts on air loss; use an external rod lock for fail-safe load holding.
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Related AirTAC ACQJ Compact Cylinders
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