Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S
The AirTAC SAIJ40X210-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 160-210 mm usable travel window from its 210 mm nominal length. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, scaling up to 1130 N of push at 0.9 MPa. The extruded aluminum barrel includes sensor grooves on both sides, and this variant is equipped with a magnet for CMSE reed and DMSE electronic solid-state switches.
This configuration uses a SUS304 stainless steel piston rod (code B) and PT tapered ports. The rear adjuster acts purely as a mechanical stop to dial in the end position during commissioning; it does not lock the load, meaning live air is required to hold position. For dead-end holding without pressure, consider SAIL or BSAI variants.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 210 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 SAIJ40BX210-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×210 | 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 SAIJ40BX210-50S Is Used
Stroke Calibration
Dial in the exact 160-210 mm travel distance during machine commissioning to perfect end-positioning without adding external stoppers.
Product Changeover
Quickly adapt the cylinder's effective stroke on automated lines when handling different product sizes that require varying reach lengths.
Machine Setup
Fine-tune the retract end-point during initial equipment assembly to synchronize movements with other pneumatic actuators.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-50S the Right Cylinder?
Choose this adjustable-stroke model when a machine setup requires variable end-stops or product changeovers without physically swapping out the cylinder. If 628 N of thrust at 0.5 MPa is insufficient, stepping up to the 63 mm bore yields 1559 N of push force, whereas dropping to the 32 mm bore reduces output to 402 N. Because this is a 210 mm stroke, the M12x1.25 rod handles moderate side loads, though longer unsupported travels still necessitate an external guide.
To match this ISO 15552 interchangeable cylinder, specify a 40 mm bore, 210 mm stroke, 50 mm adjustment, PT G1/4 port, and a -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. The standard air cushion decelerates the travel but is not a substitute for a locking mechanism.
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 SAIJ40BX210-50S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.9 MPa, the push force increases to 1130 N. The operating speed range is 30-800 mm/s.
The rear adjuster screw allows you to shorten the effective travel by up to 50 mm, creating a usable stroke window of 160 to 210 mm. This stopper fine-tunes the end position but does not hold the load without live air pressure.
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