Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 250mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke250 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB
The AirTAC ACQJ40X250-20SB is a double-acting JIS compact cylinder with a 250 mm full stroke and a 20 mm adjustable extend window, yielding a usable extension range of 230 to 250 mm. An external M12x1.25 threaded stop and lock nut restricts forward travel so you can dial in the end position directly on the machine without swapping parts. The retract stroke remains completely unaffected. This long-stroke variant exceeds the 100 mm standard maximum for this bore, classifying it as a made-to-order configuration.
Because the piston area is unchanged, output force is identical to a standard ACQ of the same 40 mm bore: 628.3 N push and 527.8 N pull at 0.5 MPa. The unit integrates a male M14x1.5 piston rod end (-B) for direct load coupling and a built-in magnet (-S) for position sensing. Deceleration relies on fixed NBR elastomer bumpers at both ends rather than adjustable air cushions. Operating pressure spans 0.15 to 1.0 MPa, with a speed range of 30 to 500 mm/s.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 250 mm |
| Adjuster thread | M12×1.25 |
| Port size | PT1/8 |
| 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 | M8×1.25 (F) / M14×1.5 (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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | 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 ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB Is Used
Machining Fixture Stops
Fine-tune the extend stop on a CNC machining fixture to accommodate raw material thickness variations without fabricating new spacer blocks.
Packaging Changeover
Rapidly adjust the extend end position during product format changeovers on a packaging line, dialing in the 230-250 mm range via the external lock nut.
Bending & Forming Trials
Iteratively set trial end positions on a metal bending station to find the exact 230-250 mm extension needed for different profile geometries.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB the Right Cylinder?
When sizing this 40 mm bore, stepping down to a 32 mm bore drops the 0.5 MPa push force to 402.1 N, while stepping up to a 50 mm bore raises it to 981.8 N. If your extend endpoint never varies, a fixed-stroke ACQ cylinder is simpler and avoids the external adjuster hardware. If you only need standard travel, note that the 250 mm stroke here is a long-stroke variant exceeding the 100 mm standard maximum for this bore. Confirm your ordering essentials: 40 mm bore, 250 mm full stroke, 20 mm window, -S magnet for electronic or reed switches, and -B male M14x1.5 rod thread. The PT1/8 port is fixed by the bore size.
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 ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull; at 0.7 MPa push is 879.6 N; max push is 128 kgf at 1.0 MPa. The full stroke is 250 mm with a 20 mm adjustable window, giving a usable extend range of 230-250 mm. The external adjuster uses an M12x1.25 thread.
No, the adjuster changes stroke length only, leaving piston area and force identical to a standard ACQ. Deceleration is handled by fixed NBR elastomer bumpers at both ends, not adjustable air cushions. The -S magnet works with reed or solid-state switches, and the -B male M14x1.5 rod thread couples directly to the load.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
Request a Quote for Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20SB
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.