Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-10
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-10 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 SAIJ40BX270-10
The AirTAC SAIJ40X270-10 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 628N of push force at 0.5 MPa. It features a SUS304 stainless steel rod and PT tapered port threads. By integrating an external stopper at the rear, this unit allows you to fine-tune the end position at commissioning without swapping out the entire cylinder.
With a 10mm adjustment range, the usable travel window spans 260-270mm. This model uses an extruded aluminum barrel with sensor grooves on both sides, operating at speeds of 30-800mm/s. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-10 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-10 |
|---|---|
| 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 SAIJ40BX270-10
| 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 SAIJ40BX270-10 Is Used
End-Position Tuning
Dial in the exact 260-270mm travel distance during machine commissioning to perfect product placement without adding external shims.
Product Changeover
Quickly adjust the stroke by up to 10mm on a packaging line when switching to a slightly different package size.
Assembly Calibration
Fine-tune the retract stop on an assembly fixture to account for tooling wear or minor material thickness variations.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-10 the Right Cylinder?
Choose this 40mm bore when you need more thrust than a 32mm cylinder (which provides 402N push at 0.5 MPa) but want a more compact footprint than the 50mm option. The adjustable stroke is ideal for machine setups requiring precise variable end-stops during product changeovers, rather than relying on a fixed-stroke SAI cylinder. To replace this unit, match the 40mm bore, 270mm stroke, 10mm adjustment, PT port, and standard mounting.
Because the 270mm stroke is moderately long, ensure external guides support any side loads to prevent rod binding. Remember that the rear screw stopper and air cushion only decelerate the travel end; for load-holding without live pressure, consider an external rod lock or the SAIL series. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX270-10 FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster screw lets you shorten the nominal 270mm stroke by up to 10mm, creating a usable travel window of 260-270mm. The adjuster functions as a mechanical stop to decelerate the load, but it does not lock or hold the position without continuous air pressure.
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