Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S
The AirTAC SAIJ40X135-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 85 to 135 mm, allowing you to dial back the nominal 135 mm stroke by up to 50 mm during commissioning. Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it fits perfectly into medium-duty applications.
This variant includes a SUS304 stainless steel rod (option B) for superior corrosion resistance and uses PT tapered port threads (G1/4). The extruded aluminum barrel features sensor grooves on both sides, and the included magnet (-S) supports CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without needing external stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAIJ40BX135-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SAIJ40BX135-50S Is Used
Machine Changeover
Dial in the 85-135 mm travel window during product size transitions without swapping the cylinder or adding external mechanical stops.
End-Position Tuning
Fine-tune the retract stroke on the fly during commissioning to achieve exact positioning, leveraging the 628 N push force at 0.5 MPa.
Diversion Gates
Adjust the actuation distance for sorting gates or stops on a conveyor line to handle varying package sizes precisely.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50S the Right Cylinder?
Choose this 40 mm bore when you need precise end-position tuning on a 135 mm nominal stroke, stepping up from a 32 mm bore (402 N push at 0.5 MPa) if your load requires more thrust. The 50 mm adjustment range is ideal for product changeovers where the required travel frequently shifts. Since the stroke is 135 mm, an external guide is recommended for optimal side-load management.
The rear adjuster and variable air cushions decelerate the travel end but do not hold the load without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series. This model is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR).
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 SAIJ40BX135-50S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 50 mm. This creates a usable travel window of 85 to 135 mm, allowing precise end-position tuning without replacing the cylinder.
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