Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40S 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 SAIJ40BX270-40S
The AirTAC SAIJ40X270-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 230-270 mm usable travel window, allowing you to dial back the 270 mm nominal stroke by up to 40 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it handles mid-range actuation with precision.
This SKU includes a SUS304 stainless steel rod for corrosion resistance and a magnetic piston for position sensing. It accepts CMSE reed and DMSE electronic switches in the dual-side sensor grooves. The PT G1/4 port and M12x1.25 rod thread are set for the 40 mm bore, while the rear stopper acts purely as a travel end-limit, not a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40S |
|---|---|
| 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 SAIJ40BX270-40S
| 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 SAIJ40BX270-40S Is Used
Machine Changeover
Dial in the 230-270 mm travel window during product size changes on a packaging line without replacing the entire cylinder.
End-Position Tuning
Fine-tune the retract end-position at commissioning to hit exact mechanical stops, eliminating the need for external spacers.
Variable Stop Placement
Adjust the stroke length on the fly to accommodate different package sizes arriving at a sorting station.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX270-40S the Right Cylinder?
Choose this 40 mm bore when you need 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore that yields 563 N. The adjustable stroke is ideal for product changeovers where the exact end-of-stroke position varies, saving you from swapping out a fixed-stroke SAI cylinder or adding external stops. To replace an ISO 15552 cylinder, match the 40 mm bore, 270 mm stroke, PT G1/4 port, and -S magnet.
Because the 270 mm stroke is moderately long, ensure your mounting configuration supports the rod against side loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Remember that the rear adjuster and air cushions only decelerate the load; for true position holding without live air, use a SAIL or BSAI lock.
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 SAIJ40BX270-40S FAQ
At 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you shorten the 270 mm nominal stroke by up to 40 mm, creating a 230-270 mm usable travel window. The adjuster acts as a physical stop and does not lock the load without live air pressure.
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