Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40
The AirTAC SAIJ40X250-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 250 mm nominal stroke that can be dialed back by up to 40 mm, yielding a usable travel window of 210 to 250 mm. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds between 30 and 800 mm/s.
This model uses PT tapered ports sized G1/4 and includes variable air cushions at both ends to manage deceleration. The rear adjuster acts purely as a mechanical stop to fine-tune the end position during commissioning; it does not lock or hold the load without continuous live air pressure. For load-holding requirements, an external pilot-operated check valve or an AirTAC SAIL lock cylinder is required.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAIJ40BX250-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAIJ40BX250-40 Is Used
Product Changeovers
Dial in the exact 210 to 250 mm end-stop during format size changes on packaging lines without adding external shims.
Machine Setup
Fine-tune the retract position at commissioning to achieve precise alignment, utilizing the 40 mm adjustment range.
Variable End Stops
Accommodate varying package sizes on a conveyor sorting system by adjusting the stroke rearward as needed.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-40 the Right Cylinder?
Select this 40 mm bore cylinder when an application demands precise end-position tuning without swapping out physical components. It provides 628 N push and 528 N pull at 0.5 MPa; if your setup requires less force, step down to the 32 mm bore (402 N push), or move up to the 50 mm bore (982 N push) for heavier loads. The adjustable 210 to 250 mm window is ideal for product changeovers on a line. To match this exact specification for an ISO 15552 replacement, ensure you specify the 40 mm bore, 250 mm stroke, 40 mm adjustment, PT ports, SUS304 rod material, and standard mounting.
Because the 250 mm stroke is substantial for this bore size, the 16 mm diameter rod will experience amplified leverage forces if the load is unsupported. An external guide mechanism is highly recommended to prevent excessive side-loading and premature seal wear. The available mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ40BX250-40 FAQ
At 0.5 MPa operating pressure, 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 mechanical adjuster allows you to shorten the 250 mm nominal stroke by up to 40 mm, creating a usable travel window of 210 to 250 mm. This adjuster functions as a travel stop and does not lock the load without live air pressure.
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