Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75 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 SAIJ40BX250-75
The AirTAC SAIJ40X250-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 175-250mm usable travel window. Delivering 879N of push force at 0.7 MPa, it uses a G1/4 port and a 16mm piston rod to handle mid-range automation tasks. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific configuration incorporates a SUS304 stainless steel rod (material code B) for superior corrosion resistance and features PT tapered port threads. The rear stopper screw lets you fine-tune the retract end position during commissioning without adding external stops. Remember that this adjuster acts only as a travel stop, not a load lock, so live air is required to hold position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75 |
|---|---|
| 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 SAIJ40BX250-75
| 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 SAIJ40BX250-75 Is Used
Product Changeover
Dial in the 175-250mm travel window on the fly to accommodate different package lengths on a packaging line without changing hardware.
Machine Setup
Fine-tune the retract end position during initial commissioning to perfectly align tooling, using the rear stopper instead of external shims.
Variable End Stops
Provide adjustable mechanical stops for testing fixtures where the exact stroke distance needs frequent tweaking across different part families.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX250-75 the Right Cylinder?
Select this 40mm bore when an application requires precise end-position tuning within a 175-250mm travel window, avoiding the need to swap cylinders for different product sizes. If your setup needs less force, stepping down to a 32mm bore yields 563N at 0.7 MPa; stepping up to a 50mm bore provides 1374N. Because the nominal stroke is 250mm, ensure adequate external guiding to prevent excessive side loading on the 16mm rod.
For a drop-in ISO 15552 replacement, match the 40mm bore, 250mm stroke, 75mm adjustment range, PT port thread, and SUS304 rod material. Note that standard SAIJ mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. If pneumatic pressure fails, this cylinder will not hold its load, so consider an AirTAC SAIL or BSAI lock variant for fail-safe holding.
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 SAIJ40BX250-75 FAQ
At 0.7 MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 738N of pull force. It can deliver up to 1130N push force at its maximum 0.9 MPa pressure.
The rear adjuster screw allows you to trim the effective stroke by up to 75mm, creating a usable travel window of 175-250mm from the 250mm nominal stroke. This stopper only sets the end position and does not lock the load without live air pressure.
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