Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20 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 SAIJ40BX135-20
The AirTAC SAIJ40X135-20 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 nominal 135 mm stroke by up to 20 mm during commissioning without adding external stops. It delivers a robust 879 N of push force at 0.7 MPa, making it well-suited for moderate load positioning tasks.
This variant is configured with a SUS304 stainless steel rod (option B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is built without a magnet for position sensing. The rear adjuster acts strictly as a travel stop to fine-tune the end position, meaning it will not hold the load dynamically without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20 |
|---|---|
| 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 SAIJ40BX135-20
| 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 SAIJ40BX135-20 Is Used
Machine Setup & Changeover
Dial in the exact retract distance within the 115-135 mm window during line changeovers, avoiding the need to physically swap cylinders for different product sizes.
Variable End Stops
Use the rear mechanical stopper to fine-tune the final end position at commissioning, compensating for minor mechanical tolerances without adding bulky external stops.
Corrosion-Resistant Actuation
Leverage the SUS304 stainless steel rod for moderate-force pushing tasks in environments where standard carbon steel rods might face moisture or chemical exposure.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-20 the Right Cylinder?
Choose this adjustable-stroke model when your application requires precise end-position tuning at setup or frequent product changeovers, rather than relying on a fixed-stroke SAI cylinder. If you need slightly less force, stepping down to a 32 mm bore yields 563 N of push force at 0.7 MPa. For higher force demands, moving up to a 50 mm bore provides 1374 N. Because this is a 135 mm stroke, the 16 mm rod and M12x1.25 thread handle standard side loads adequately, but an external guide is recommended for heavy lateral stresses.
As a true ISO 15552 profile cylinder, it is dimensionally interchangeable with other ISO 15552 cylinders. To match this replacement exactly, specify a 40 mm bore, 135 mm stroke, 20 mm adjustment range, PT ports, and no magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting the FB, CA, CB, and CR styles. If your process requires the load to be held without continuous air pressure, you must integrate an external pilot-operated check valve or select a different cylinder type like the SAIL or BSAI.
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 SAIJ40BX135-20 FAQ
At a standard operating pressure of 0.7 MPa, this 40 mm bore cylinder generates 879 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective stroke from the nominal 135 mm down to a minimum of 115 mm. This provides a 20 mm tuning window to set the exact retract end position during machine commissioning.
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