Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20B
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20B 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 ACQJ20X40-20B
The AirTAC ACQJ20X40-20B is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend end position. You can fine-tune the usable extend stroke from 20 mm up to the full 40 mm directly on the machine without swapping parts. The retract stroke remains completely unaffected by this adjustment.
Because the piston area stays the same, the output force is identical to a standard ACQ of this bore, delivering a push of 157.1 N at 0.5 MPa. This unit features a male M8x1.25 piston rod end for direct load coupling, a 10 mm rod diameter, and fixed elastomer bumpers at both ends. The body includes sensor grooves, though this specific configuration ships without a magnet.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20B Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20B |
|---|---|
| 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 ACQJ20X40-20B
| 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 ACQJ20X40-20B Is Used
Product Changeover Stops
Quickly modify the extend end position on a machining fixture when switching between part families, using the lock nut to set the new 20 to 40 mm target.
Variable Height Flaps
Dial in the exact push distance for carton sealing mechanisms on a packaging line without removing the cylinder from its mount.
Trial End Positions
Test different extend endpoints during lab prototype development to find the optimal kinematic motion before finalizing a design.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20B the Right Cylinder?
If you require less force, the adjacent smaller bore (16 mm) provides 100.5 N push at 0.5 MPa, while stepping up to a 25 mm bore yields 245.4 N push. If your end position never needs adjustment, a standard fixed-stroke ACQ20 cylinder is sufficient. When ordering this adjustable model, confirm the 20 mm bore, 40 mm full stroke, 20 mm adjustable window, the male M8x1.25 rod thread, and whether you need the magnet option for your sensors.
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 ACQJ20X40-20B FAQ
The usable extend range is 20-40 mm (full 40 mm stroke minus up to 20 mm). The force is identical to a standard ACQ20: push is 157.1 N and pull is 117.8 N at 0.5 MPa, push is 219.9 N at 0.7 MPa, and maximum push is 32 kgf at 1.0 MPa.
An external M8x1.25 threaded stop with a lock nut mechanically limits the extend distance without changing the piston area or force. The cylinder uses fixed elastomer bumpers for deceleration, not adjustable air cushions. The body has sensor grooves, but this model ships without a magnet, so add a magnet separately if you need reed or solid-state switch detection.
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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