Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S
The AirTAC SAIJ40X85-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628 N of push force at 0.5 MPa and features a PT tapered port thread. By turning the rear screw, you achieve a usable travel window of 55 to 85 mm, allowing precise end-position tuning without adding external stops.
This variant includes a SUS304 stainless steel rod for superior corrosion resistance and an integrated magnet (-S) for position sensing. It works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches mounted into the dual-side sensor grooves on the extruded aluminum barrel. The adjuster acts purely as a mechanical stop to set the retract distance, so live air pressure is required to maintain the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAIJ40BX85-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SAIJ40BX85-30S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance between 55 and 85 mm during machine setup to accommodate varying material thicknesses without swapping hardware.
Product Size Changeover
Quickly re-adjust the stroke window on automated packaging lines when switching between different product dimensions, minimizing downtime.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for reliable clamping and positioning in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-30S the Right Cylinder?
Select this 40 mm bore when an application requires fine-tuning the retract end-point during commissioning or product changeover, rather than relying on a fixed-stroke SAI cylinder. If your setup needs less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. Because the stroke is under 300 mm, side-load stress on the 16 mm rod is manageable, though external guides remain recommended for heavy off-center loads.
To match this ISO 15552 dimensionally interchangeable cylinder, confirm the 40 mm bore, 85 mm nominal stroke, 30 mm adjustment range, PT ports, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. For applications requiring true load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead, as the SAIJ adjuster is not 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 SAIJ40BX85-30S 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, allowing you to shorten the effective stroke from its 85 mm nominal length down to as little as 55 mm. It sets the travel end-point but does not lock or hold the load without continuous air pressure.
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