Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30 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 SAIJ40BX270-30
The AirTAC SAIJ40X270-30 is a double-acting, adjustable-stroke ISO 15552 profile cylinder. It features a 40mm bore and a 270mm nominal stroke equipped with a rear stopper screw that allows you to trim the effective travel back by up to 30mm, creating a precise 240-270mm usable window. Delivering 628N of push force at 0.5MPa and 879N at 0.7MPa, it provides reliable thrust for mid-range actuation. The rod is constructed from SUS304 stainless steel (code B), and the fluid supply connects via PT tapered ports.
This model lets you fine-tune the retract end position at commissioning or during product changeover without swapping the cylinder or adding external stops. It utilizes a reduced mounting set—Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting the FB, CA, CB, and CR options. The extruded aluminum barrel includes sensor grooves on both sides for future integration of CMSE reed or DMSE electronic solid-state switches if needed.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30 |
|---|---|
| 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 SAIJ40BX270-30
| 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 SAIJ40BX270-30 Is Used
Machine Changeover
Dial in the exact retract position during product size changeovers without disassembling the actuator or installing shims.
Variable End Stops
Set precise material push-off distances on a packaging line by adjusting the rear screw within the 240-270mm window.
Commissioning Calibration
Fine-tune the final end-of-stroke position during initial machine setup to perfect timing and avoid mechanical hard stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-30 the Right Cylinder?
Choose this SAIJ40X270-30 when your setup requires variable end-stops or precise positioning tweaks within a 240-270mm travel window. If your application needs less force, stepping down to a 32mm bore yields 402N of push at 0.5MPa; conversely, stepping up to a 50mm bore provides 982N. Because this cylinder lacks a magnet, you cannot track piston position without adding external sensors. The rear adjuster functions strictly as a travel stop to set deceleration, not as a lock; it will not hold a load without live air pressure. For true load-holding, consider the SAIL or BSAI series.
As a dimensionally interchangeable ISO 15552 cylinder, it directly maps to a 40mm bore, 270mm stroke, up to 30mm adjustment, PT thread ports, SUS304 rod, and no magnet. Since the 270mm stroke exceeds 300mm only slightly, side-load risks are moderate, but an external guide is still recommended for heavy or off-center loads to protect the 16mm rod and M12x1.25 rod thread.
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 SAIJ40BX270-30 FAQ
An external adjusting screw at the rear acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 30mm. This creates a usable travel window of 240-270mm, letting you fine-tune the end position without replacing the cylinder.
At 0.5MPa operating pressure, it provides 628N of push force and 528N of pull force. At 0.7MPa, the push force increases to 879N.
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