Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30
The AirTAC SAIJ40X125-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits you to dial back the travel by up to 30 mm. This creates a usable stroke window of 95 to 125 mm, enabling precise end-position tuning at commissioning without swapping the barrel or bolting on external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This SKU is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads (G1/4). The extruded aluminum barrel includes sensor grooves on both sides, though this specific unit is built without a magnet for position sensing. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 SAIJ40BX125-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAIJ40BX125-30 Is Used
Machine Changeover
Dial in the exact retract distance within the 95-125 mm window during product size changes without physically replacing the cylinder or adding shims.
End-Position Tuning
Fine-tune the final resting position of tooling at commissioning to compensate for mechanical tolerances using the rear adjusting screw.
Variable End Stops
Set a precise travel limit for assembly presses or clamping stations where the exact end position must be adjusted per batch.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX125-30 the Right Cylinder?
Choose this 40 mm bore when an application requires approximately 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) for heavier payloads, or down from a 50 mm bore (982 N) to save space and air consumption. The adjustable stroke is ideal for machine setups requiring variable end stops or frequent product-size changeovers. Unlike a fixed-stroke SAI cylinder, the 30 mm adjustment window allows you to fine-tune the retract position on the fly.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 125 mm stroke, 30 mm adjustment, PT port thread, and standard mounting interface. SAIJ supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 125 mm stroke is under 300 mm, side-load stress on the 16 mm rod and M12x1.25 rod thread is moderate, but an external guide is still recommended for heavy lateral loads. For load-holding without live pressure, use an external rod lock or select a SAIL or BSAI cylinder, as the rear adjuster is not a brake.
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 SAIJ40BX125-30 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 the maximum 1.0 MPa pressure, it delivers 1130 N of push force.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 125 mm down to a minimum of 95 mm. This allows you to set the exact end position during commissioning, but it does not lock the load without continuous air pressure.
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