Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S
The AirTAC SAIJ40X50-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel down to a 10-50 mm window without adding external stops. Built with a SUS304 stainless steel rod, it provides excellent corrosion resistance and handles a 628 N push force at 0.5 MPa. The PT tapered porting and integrated magnet for CMSE or DMSE sensors make it highly adaptable for precise automation.
This adjustable-stroke model uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. The rear adjuster acts purely as a travel stop for end-position tuning and works alongside the variable air cushions at both ends, but it does not hold the load without live air pressure. For position-holding requirements, a SAIL or BSAI variant would be required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAIJ40BX50-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SAIJ40BX50-40S Is Used
Machine Setup Calibration
Dial in the exact 10 to 50 mm travel window during commissioning to perfectly position parts without machining custom spacers.
Product Changeover
Quickly adjust the retract end-position on a packaging line when switching to a different package size, minimizing downtime.
Variable End-Stop Clamping
Apply up to 628 N of clamping force at 0.5 MPa while fine-tuning the stroke to accommodate varying workpiece thicknesses.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX50-40S the Right Cylinder?
Choose this 40 mm bore when you need 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore that provides 402 N, or down from a 50 mm bore yielding 982 N. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, saving the time of physically swapping a fixed-stroke SAI cylinder. When ordering a replacement, verify the 50 mm nominal stroke, 40 mm adjustment range, PT port threads, and the -S magnet option for sensor compatibility.
Because the 50 mm stroke is short, side-loading is minimal, but the 16 mm rod and M12x1.25 thread still require standard alignment to prevent premature seal wear. Remember that the rear adjuster and air cushions only decelerate the travel end; they are not a brake, so any load-holding application without live air requires an external rod lock or a SAIL cylinder.
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 SAIJ40BX50-40S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder generates a push force of 628 N and a pull force of 528 N. At 0.7 MPa, the push force increases to 879 N.
The nominal stroke is 50 mm, but the rear adjuster screw allows you to shorten the effective travel by up to 40 mm, creating a usable 10 to 50 mm stroke window. This stopper only sets the end position and does not lock the load without live air pressure.
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