Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 40mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke40 mm
- Port sizeM5×0.8
- Adjuster threadM8×1.25
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB
The ACQJ20X40-30SB is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend stroke. You can fine-tune the extend end position on the machine without swapping parts, achieving a usable extend range of 10-40 mm (a 40 mm full stroke minus up to a 30 mm window). The retract stroke remains completely unaffected by this adjustment.
Because the piston area stays the same, output force is identical to a standard ACQ of this bore, delivering 157.1 N of push force at 0.5 MPa. This bore 20 unit features a 10 mm rod, M5x0.8 port, fixed elastomer bumpers at both ends, and operates at speeds from 30 to 500 mm/s. The included -S magnet works with reed or electronic solid-state switches, while the -B male M8x1.25 rod end couples directly to your load.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 40 mm |
| Adjuster thread | M8×1.25 |
| Port size | M5×0.8 |
| 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 | M5×0.8 (F) / M8×1.25 (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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB Is Used
Machining Fixture Clamps
Dial in the exact clamping reach on a CNC fixture during setup, shortening the extend stroke from 40 mm down to 10 mm to accommodate varying raw material thicknesses.
Packaging Diverter Arms
Adjust the pusher end position on the fly for different carton sizes without replacing the cylinder, ensuring correct routing on a packaging line.
Assembly Pick-and-Place
Set trial end positions for vertical placement moves when testing new product heights before locking down the final extend stop distance.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB the Right Cylinder?
If you need slightly less thrust, the adjacent bore 16 option provides 100.5 N push at 0.5 MPa, whereas stepping up to bore 25 yields 245.4 N. Choose this adjustable variant when trial end positions or product changeovers require frequent on-site stroke modifications; if the extend distance is permanently fixed, a standard ACQ cylinder is sufficient. Confirm your ordering essentials: 20 mm bore, 40 mm full stroke, 30 mm adjuster window, -S magnet, and -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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-30SB FAQ
It provides 157.1 N push and 117.8 N pull force at 0.5 MPa, 219.9 N push at 0.7 MPa, and a maximum push of 32 kgf at 1.0 MPa. The full stroke is 40 mm with a 30 mm adjustment window, giving a usable extend range of 10-40 mm.
No, the external M8x1.25 threaded stop changes the extend length only, leaving the piston area and force identical to a standard ACQ. Deceleration is handled by fixed elastomer bumpers at each end, not adjustable air cushions. Note that a plain cylinder does not hold its load on air loss; for fail-safe holding, use an external rod lock.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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