Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S
The AirTAC SAIJ40X185-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a nominal 185 mm stroke that can be dialed back by up to 100 mm, giving you a usable travel window of 85 to 185 mm to fine-tune end positions during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and heavier 50 mm units. This variant uses a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors.
The extruded aluminum barrel integrates sensor grooves on both sides for flexible switch mounting. Unlike fixed-stroke SAI models, this adjustable version eliminates the need to physically swap cylinders or bolt on external stops when product sizes change on a line. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. The rear adjuster acts strictly as a travel stop to set deceleration endpoints and does not lock or hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 185 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 SAIJ40BX185-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SAIJ40BX185-100S Is Used
Variable End-Stop Positioning
Dial in the exact 85 to 185 mm travel required for varying material thicknesses or product lengths without adding external mechanical stops.
Machine Changeover Setup
Quickly reconfigure the cylinder's retract endpoint during product family changeovers, reducing downtime and eliminating cylinder swapping.
Corrosive Environment Automation
Leverage the SUS304 stainless steel rod for reliable actuation in washdown or mildly corrosive manufacturing settings while using DMSE sensors.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-100S the Right Cylinder?
Choose this 40 mm bore when you need 628 N of push thrust at 0.5 MPa (or 879 N at 0.7 MPa) alongside highly variable end-stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N; if you need more power, stepping up to a 50 mm bore provides 982 N. The wide 85-185 mm adjustment range is ideal for machines running multiple product sizes, allowing you to reconfigure the travel endpoint on the fly without replacing the cylinder. For holding loads safely without live air, select the SAIL or BSAI series instead, as the SAIJ adjuster is not a locking mechanism.
This configuration specifies a PT tapered port and a SUS304 stainless steel rod. The 16 mm rod and M12x1.25 thread provide robust resistance to side loads, though any stroke exceeding 300 mm would still require an external guide. It is dimensionally interchangeable per ISO 15552 mounting-interface dimensions, making it a drop-in replacement for standard ISO profile cylinders.
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 SAIJ40BX185-100S FAQ
At 0.5 MPa, 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 allows you to shorten the 185 mm nominal stroke by up to 100 mm, creating a usable travel window of 85 to 185 mm for fine-tuning end positions without replacing the cylinder.
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