Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 270mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S
The AirTAC SAIJ40X270-30-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 240-270 mm usable travel window, allowing you to dial back the 270 mm nominal stroke by up to 30 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and mid-sized 50 mm units.
This specific SKU is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet (-S) for position sensing. It is compatible with AirTAC CMSE reed and DMSE solid-state sensors. The extruded aluminum barrel includes sensor grooves on both sides, and the fluid port utilizes a PT tapered thread.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
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 SAIJ40 Adjustable Cylinder SAIJ40BX270-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×270 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S Is Used
Machine Changeover
Quickly fine-tune the retract end position by up to 30 mm when switching between product sizes on a packaging line, avoiding mechanical rebuilds.
End-Stop Calibration
Dial in the exact 240-270 mm travel window during commissioning to perfect part ejection or clamping without physically machining new stopper blocks.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod for reliable actuation in washdown or mildly corrosive manufacturing environments requiring precise stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S the Right Cylinder?
Choose this 40 mm bore when your application requires more thrust than a 32 mm cylinder (402 N at 0.5 MPa) but you want a more compact footprint than a 50 mm option (982 N). The 30 mm rear adjuster is perfect for product changeovers, letting you set variable end stops without adding external physical stops or swapping the cylinder. For strokes of 270 mm, the 16 mm rod diameter handles moderate side loads, but an external guide is recommended for heavy unsupported loads.
This adjustable model differs from a fixed-stroke SAI by allowing fine end-position tuning. Remember that the rear adjuster acts only as a travel stop, not a lock; the plain SAIJ does not hold loads without live air. For load-holding without pressure, consider an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock. This cylinder is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/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/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30S FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1130 N of push force.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 270 mm nominal stroke down to 240 mm. It only sets the end position and does not lock or hold the load without live air pressure.
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