Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20S 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 SAIJ40BX135-20S
The AirTAC SAIJ40X135-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 115 to 135 mm, allowing you to dial back the end position by up to 20 mm during commissioning. Delivering 879 N of push force at 0.7 MPa, it bridges the gap between smaller 32 mm bores and 50 mm options.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet supports CMSE reed and DMSE electronic switches for precise position feedback.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20S |
|---|---|
| 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 SAIJ40BX135-20S
| 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 SAIJ40BX135-20S Is Used
Machine Changeovers
Quickly reposition the retract end-stop by up to 20 mm when switching product sizes on a packaging line, avoiding the need to physically swap cylinders.
End-Position Tuning
Dial in the exact 115 to 135 mm travel window during initial commissioning to absorb mechanical tolerances and ensure precise end-of-stroke contact.
Stainless Rod Actuation
Leverage the SUS304 stainless steel rod in light manufacturing environments where moisture or minor chemical splash demands higher corrosion resistance.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20S the Right Cylinder?
Choose this 40 mm bore when an application requires more thrust than a 32 mm bore (which yields 563 N at 0.7 MPa) but does not warrant the larger 982 N output of a 50 mm cylinder. The adjustable stroke is ideal for machine changeovers, letting you fine-tune the retract end position without adding external stops or swapping out a fixed-stroke SAI cylinder. For strokes of 135 mm, side loads are moderate, but always guide the load externally if rod deflection is a risk.
Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure. For true fail-safe load holding, consider an external rod lock or the AirTAC SAIL or BSAI series. This SAIJ40X135-20-S is dimensionally interchangeable per ISO 15552, features a PT G1/4 port, and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX135-20S FAQ
At a standard operating pressure of 0.7 MPa, this 40 mm bore cylinder provides 879 N of push force and 724 N of pull force. It can reach a maximum of 1130 N push force at 1.0 MPa.
A rear external screw acts as a mechanical stopper, allowing you to shorten the nominal 135 mm stroke by up to 20 mm. This creates an adjustable 115 to 135 mm travel window. The adjuster only sets the end position; it does not lock or hold the load without continuous air pressure.
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