Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40S 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 SAIJ40BX210-40S
The AirTAC SAIJ40X210-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 210 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a precise 170-210 mm usable travel window. Delivering 879 N of push force at 0.7 MPa, it fits perfectly into medium-duty setups. The barrel features sensor grooves on both sides, and because this SKU includes the -S magnet, it interfaces directly with AirTAC CMSE reed and DMSE electronic solid-state switches.
This model utilizes a SUS304 stainless steel rod (option B) for superior corrosion resistance and carries a PT tapered port thread. You can dial in the exact end position during commissioning without swapping out the cylinder or adding external stops. The rear screw acts purely as a travel stop to set the deceleration point alongside the standard air cushions; it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40S |
|---|---|
| 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 SAIJ40BX210-40S
| 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 SAIJ40BX210-40S Is Used
Product Size Changeovers
Quickly dial the rear adjuster to shift the 170-210 mm travel end-point when a packaging line switches to a different carton length.
Machine Commissioning
Fine-tune the final retract position during setup without machining new hard stops or removing the cylinder from the fixture.
Variable End-Stop Diverter
Act as a retracting diverter gate where the exact stopping distance must be tweaked on the fly to accommodate varying product widths.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX210-40S the Right Cylinder?
Select this 40 mm bore when an application requires more power than a 32 mm bore (which provides 563 N push at 0.7 MPa) but lacks the physical space for a 50 mm option (1374 N push at 0.7 MPa). The adjustable 170-210 mm window is ideal for machines processing multiple product sizes, allowing operators to change the end-stop rapidly rather than maintaining an inventory of fixed-stroke SAI cylinders. If your process demands true load-holding in the event of air pressure loss, a plain SAIJ is insufficient—you should look toward the SAIL or BSAI locking variants instead.
To achieve a true ISO 15552 replacement match, verify the 40 mm bore, 210 mm stroke, 40 mm adjustment range, PT port thread, and the -S magnet option. The 16 mm piston rod and M12x1.25 rod thread handle moderate side loads well, but because the stroke exceeds 300 mm in larger variants, always ensure external guiding for long unsupported travel. This SAIJ variant supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR configurations.
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 SAIJ40BX210-40S FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 736 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm from the 210 mm nominal length, creating a 170-210 mm travel window. The screw functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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