Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-100 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 SAIJ40BX270-100
The AirTAC SAIJ40X270-100 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 170 to 270 mm, allowing you to dial back the nominal stroke by up to 100 mm during commissioning without adding external stops. It delivers 628 N of push force at 0.5 MPa and reaches speeds of 30-800 mm/s.
This SKU is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. The rear adjuster acts purely as a travel stop for end-position tuning, not as a lock, so live air pressure is required to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-100 |
|---|---|
| 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 SAIJ40BX270-100
| 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 SAIJ40BX270-100 Is Used
Machine Setup Changeover
Fine-tune the 170-270 mm travel window during product size changeovers without physically swapping cylinders or bolting on external stopper blocks.
Variable End-Stop Positioning
Dial in the exact retract distance for a conveyor sorting arm, accommodating different package sizes on the fly via the rear adjustment screw.
Commissioning Stroke Tuning
Trim the effective stroke by up to 100 mm during initial machine commissioning to perfect the end-of-travel position and prevent mechanical binding.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-100 the Right Cylinder?
Choose this 40 mm bore when you need 628 N of push force at 0.5 MPa and a highly flexible end-stop. If your application requires less force, the 32 mm bore offers 402 N; for heavier loads, the 50 mm bore provides 982 N. The 100 mm adjustment range is ideal for product changeovers on a line where the precise end position shifts frequently, avoiding the need to swap out a fixed-stroke SAI cylinder.
To replace an ISO 15552 cylinder, match the 40 mm bore, 270 mm nominal stroke, 100 mm adjustment, PT port thread, and the basic mounting interface (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the 270 mm stroke is relatively long, ensure adequate external guiding to prevent side-loading on the rod. For load-holding without live air, use a SAIL or BSAI cylinder instead.
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 SAIJ40BX270-100 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If operated at 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw lets you mechanically shorten the effective stroke by up to 100 mm, creating a usable travel window of 170 to 270 mm. It functions as a travel stop for end-position tuning and does not lock or hold the load without live air pressure.
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