Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-40 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 SAIJ40BX135-40
The AirTAC SAIJ40X135-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879 Newtons of push force at 0.7 MPa and features a 135 mm nominal stroke that can be fine-tuned down by up to 40 mm, creating a precise 95-135 mm usable travel window. This built-in adjustability allows you to dial in the retract end position during commissioning without adding external stopper blocks.
Configured with a SUS304 stainless steel rod (option B) and PT tapered ports, this 40 mm bore unit utilizes an M12x1.25 rod thread. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard cylinders.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-40 |
|---|---|
| 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 SAIJ40BX135-40
| 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 SAIJ40BX135-40 Is Used
Machine Changeovers
Quickly reconfigure the 95-135 mm travel window during product size changeovers without physically swapping the cylinder or adding external stops.
End-Position Tuning
Fine-tune the retract end position at commissioning to dial in exact mechanical stops, compensating for mechanical tolerance stack-ups.
Variable End Stops
Adjust the stroke on the fly for diverter arms or positioning mechanisms that handle multiple package sizes on a single conveyor line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-40 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires 879N of push force at 0.7 MPa; if you need less force, step down to the 32 mm bore (563N), or step up to the 50 mm bore (1374N) for heavier loads. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product size changeovers on a line. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an external rod lock or the AirTAC SAIL series.
To replace an ISO 15552 cylinder, match the 40 mm bore, 135 mm stroke, 40 mm adjustment range, PT port thread, and your required mounting style. Because this unit lacks the -S magnet suffix, it will not work with CMSE or DMSE sensors without modification.
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 SAIJ40BX135-40 FAQ
At 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 Newtons of push force and 528 Newtons of pull force. At 0.5 MPa, the push force is 628 Newtons.
The rear adjuster screw allows you to shorten the effective stroke by up to 40 mm. This creates a usable travel window of 95-135 mm from the 135 mm nominal stroke, letting you set the exact retract position without changing the cylinder.
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