Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB
The AirTAC Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø125mm bore and 125mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ125 mm
- Full stroke125 mm
- Port sizePT3/8
- Adjuster threadM27×2.0
About the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB
The ACQJ125X125-50SB is a double-acting JIS compact cylinder featuring a 125mm bore and a big-bore design capable of strokes up to 300mm. An external M27x2.0 threaded stop and lock nut mechanically limits the extend end position. You can tune the usable extend range from 75mm up to the full 125mm directly on your machinery, while the retract stroke remains completely unaffected.
Because the adjuster only alters piston travel, output force stays identical to a standard ACQ of this size. At 0.5 MPa it delivers 6135.9N push and 5733.8N pull. This SB configuration includes a male M30x1.5 rod end for direct load coupling, a piston magnet for electronic or reed sensors, and fixed NBR elastomer bumpers at both ends.
Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB Technical Specifications
| Model | Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø125 mm |
| Full stroke | 125 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 ACQJ125X125-50SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 ACQJ125X125-50SB Is Used
Heavy Press Tonnage Setup
Dial in the exact 75 to 125mm extend contact point during heavy press commissioning without machining new spacer blocks.
Automotive Welding Changeover
Shift the extend endpoint on the fly when switching between automotive fixture jigs of varying chassis dimensions.
Large Mold Trial Positioning
Test multiple end positions on large injection molding machinery to find the optimal clamping depth before final lock-down.
Is the Airtac ACQJ125~160 Adjustable Compact Cylinder ACQJ125X125-50SB the Right Cylinder?
When sizing this big-bore unit, stepping down to a 100mm bore drops the 0.5 MPa push force to 3927N, whereas stepping up to a 140mm bore raises it to 7696.9N. If your application never requires end-position variance, a fixed-stroke ACQ cylinder provides the same holding power in a simpler package. To order this adjustable variant, confirm the 125mm bore, 125mm full stroke, 50mm window, the S magnet option, and the B male 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 ACQJ125X125-50SB FAQ
It provides 6135.9N push and 5733.8N pull at 0.5 MPa, 8590.3N push at 0.7 MPa, and a maximum push of 1251 kgf at 1.0 MPa. The 50mm window allows you to shorten the extend stroke, giving a usable extend range of 75-125mm.
The M27x2.0 external stop with lock nut limits only the extend length, leaving retract untouched and keeping force identical to a standard ACQ. It uses fixed NBR bumpers, not a brake; since air pressure loss causes rod drift, use an external rod lock for fail-safe load holding.
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Related AirTAC ACQJ Compact Cylinders
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