Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S
The AirTAC SAIJ40X950-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling precise end-position tuning without external stops. It provides a usable travel window of 930 to 950 mm, making it highly effective for product changeovers on automated lines. Delivering 628 N of push force at 0.5 MPa, it handles medium-duty positioning with reliability.
This variant features a SUS420J2 stainless steel rod for superior corrosion resistance and includes an integrated magnet for CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible mounting. Because the 950 mm stroke is a non-standard made-to-order length, the robust 16 mm rod and M12x1.25 thread are essential to manage deflection over this extended travel distance.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 950 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 SAIJ40AX950-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×950 | 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 SAIJ40AX950-20S Is Used
Machine Changeover
Fine-tune the 930-950 mm retract position during product size transitions to avoid repositioning physical stopper hardware.
Extended Transfer Lines
Manage long-stroke actuation on conveyor sorting gates where exact end-of-travel positioning varies by package dimensions.
Assembly Presses
Use the rear screw to set precise lower limits on extended-stroke assembly stations, compensating for tooling wear over time.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX950-20S the Right Cylinder?
Selecting this adjustable-stroke model over a fixed SAI cylinder allows operators to dial in the exact retract end-position during commissioning, absorbing mechanical tolerances without machining external stopper blocks. If your application requires less push force, the 32 mm bore offers 402 N at 0.5 MPa; conversely, stepping up to the 50 mm bore yields 982 N for heavier payloads.
When configuring your ISO 15552 replacement, verify the 40 mm bore, 950 mm stroke, 20 mm adjustment, PT tapered ports, and the -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. For any stroke of 300 mm or more, an external guide is strongly recommended to prevent side-load damage. Remember that the rear adjuster is a travel stop, not a lock; to hold loads without live air pressure, consider the SAIL or BSAI series.
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 SAIJ40AX950-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the nominal 950 mm stroke by up to 20 mm, providing a usable travel window of 930 to 950 mm. This stopper decelerates the end position but does not lock the load without live air pressure.
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