Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S
The AirTAC Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S is a genuine double-acting profile-type standard air cylinder with a Ø40mm bore and 70mm stroke, 1/4" air ports and adjustable end cushioning. Its hard-anodized aluminum-profile barrel is shorter than an ISO 15552 cylinder of the same bore, and it shares SC-series mounting accessories.
- BoreØ40 mm
- Stroke70 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
- 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 SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S
The AirTAC SAUJ40X70-20S is a double-acting, single-rod profile cylinder with an on-site stroke adjustment window. A 20mm external stop screw lets you trim the extend stroke from its 70mm maximum down to 50mm, perfect for dialing in final positioning without buying new hardware. The extruded aluminum profile barrel makes it shorter than an ISO 15552 unit of the same bore. Equipped with a 1/4" port and a 16mm rod, it delivers 628N push and 528N pull at 0.5MPa.
This -S variant includes a built-in piston magnet for CMSG, DMSG, or EMSG sensors. For sizing, a safe working load is roughly 377N (about 60% of the 628N push figure), yielding a 32kg vertical lift capacity with a 2:1 safety margin. Standard adjustable air cushions decelerate the piston near the ends, while high-temp Viton H seals can extend operation up to 150C.
Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S Technical Specifications
| Model | Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S |
|---|---|
| Series | SAU profile-type cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAU series datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G (BSPP). A high-temperature seal (0-150 °C) is available.
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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S
| SAU | Profile-type standard cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAU-family variants: SAUD (double rod), SAUJ (adjustable stroke), SAUF (with built-in solenoid valve), and SAU-S with built-in magnet. Seals: TPU (blank) / Viton H / NBR N. Sensor switches: CMSG / DMSG / EMSG.
Where the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S Is Used
Clamp Pressure Tuning
Dial in exact clamping force on fragile parts by shortening the extend stroke up to 20mm on-site to prevent crushing.
Package Diverter Setup
Adjust the pusher rod extension precisely to match varying box widths on a packaging line without changing cylinders.
Component Insertion
Fine-tune the insertion depth of pins or plugs into assemblies, using the magnetic piston to confirm the exact end position.
Is the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S the Right Cylinder?
When sizing this 40mm bore, compare it against the 32mm (402N push @0.5MPa) and 50mm (982N push @0.5MPa) options to match your force needs. Choose the SAUJ over a fixed SAU when your machine assembly requires manual extend-length tuning within the 50-70mm range via the stop screw. Mounting is available in Basic, FA flange, and LB foot styles, compatible with the AirTAC SC series. The -S option provides the magnet required for position sensing. For strokes at or over 300mm, always use an external guide to prevent side-load damage.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB — same as SC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X70-20S FAQ
At 0.5MPa it provides 628N push and 528N pull. Push force is 879N at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. The 70mm nominal extend stroke can be shortened by up to 20mm via the external stop screw, giving a usable range of 50-70mm.
The -S suffix means a magnet is installed for CMSG, DMSG, or EMSG sensors. Note that the stop screw only sets the end position; it is not a load lock. The air cushion only decelerates the piston. If air is lost, the cylinder will drift, so use an external rod lock or pilot-operated check valve for held loads.
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