Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X300-20
The AirTAC Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X300-20 is a genuine double-acting profile-type standard air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 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 SAUJ40X300-20
The AirTAC SAUJ40X300-20 is a double-acting, single-rod profile cylinder with an on-site adjustable extend stroke. An external stop screw lets you shorten the 300 mm nominal travel by up to 20 mm, yielding a usable range of 280-300 mm. This prevents buying a custom cylinder for minor field tweaks. It features a 1/4" port, an M12x1.25 rod thread, and 21 mm adjustable air cushions.
This 40 mm bore generates 628 N push and 528 N pull at 0.5 MPa, peaking at 128 kgf at 1.0 MPa. The extruded aluminum profile is shorter than an ISO 15552 unit of the same bore. For sizing, the safe working load is roughly 377 N, and vertical lift capacity is about 32 kg with a 2:1 margin. This SKU lacks a magnet, so it cannot accept CMSG or DMSG sensors.
Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X300-20 Technical Specifications
| Model | Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X300-20 |
|---|---|
| Series | SAU profile-type cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAUJ40X300-20
| SAU | Profile-type standard cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SAUJ40X300-20 Is Used
Clamp Position Trimming
Dialing in the exact clamping depth on machining fixtures where a 20 mm extend adjustment window corrects for material thickness variations.
Transfer Stopper Tuning
Acting as a height-specific flow stop on a conveyor line, allowing operators to shorten the extend stroke by up to 20 mm to match new package sizes.
Sealing Head Alignment
Setting the precise down-stroke position on a packaging flap sealer, using the stop screw to avoid crushing delicate cartons.
Is the Airtac SAUJ40 Adjustable Stroke Cylinder SAUJ40X300-20 the Right Cylinder?
Size both ways: dropping to a 32 mm bore cuts thrust to 402 N, while stepping up to 50 mm raises it to 982 N at 0.5 MPa. Choose SAUJ over a fixed SAU when your machine assembly needs plus/minus 20 mm of extend fine-tuning without machining a hard stop. Mounting options include Basic, FA flange, and LB foot, sharing compatibility with the AirTAC SC series. Because this is a 300 mm stroke, support external guides to prevent rod bending under side loads. Note that this non-magnetic SKU cannot accept position sensors.
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 SAUJ40X300-20 FAQ
At 0.5 MPa it provides 628 N push and 528 N pull. Push rises to 879 N at 0.7 MPa and 1130 N at 0.9 MPa, with a 128 kgf maximum at 1.0 MPa. The 300 mm nominal extend stroke can be shortened by up to 20 mm via the external stop screw, giving a 280-300 mm working range.
The external stop screw physically limits the piston's extend travel, setting the end position. It is not a load lock. A plain cylinder drifts on air loss or valve centering, and the 21 mm air cushion only decelerates near stroke end. For secure load holding, install an external rod lock or pilot-operated check valve.
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