Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30S 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 SAIJ40BX950-30S
The AirTAC SAIJ40X950-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 950mm nominal stroke that can be fine-tuned down by up to 30mm, providing an exact 920-950mm usable travel window. This cylinder includes a SUS304 stainless steel rod (code B) for superior corrosion resistance and a PT tapered port thread.
Because the adjuster acts purely as a mechanical stop on the retract end, it cannot hold a load without continuous live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, and the integrated magnet (-S) supports position detection using AirTAC CMSE reed or DMSE electronic solid-state switches.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30S |
|---|---|
| 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 SAIJ40BX950-30S
| 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 SAIJ40BX950-30S Is Used
Variable End-Stop Positioning
Ideal for assembly stations requiring precise retract stops. Dial back the stroke by up to 30mm to accommodate varying part sizes without adding external stopper blocks.
Product Changeover Systems
Quickly adjust the 920-950mm travel window during line format changes. The SUS304 rod ensures durability in environments where washdowns or material handling causes corrosion.
Long-Stroke Guiding
Provides 628N of push force over a 950mm span. The external adjuster allows fine-tuning of the end position, while the stroke length supports large-format machining or material feed tasks.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-30S the Right Cylinder?
Choose this 40mm bore when an application requires moderate thrust (628N push / 528N pull at 0.5 MPa) and exact end-position tuning during commissioning without swapping cylinders. If your setup demands less force, stepping down to a 32mm bore yields 402N push force; stepping up to a 50mm bore provides 982N. The adjustable stroke is ideal for product changeovers, whereas a fixed SAI cylinder is preferred for repetitive, single-length cycles.
At 950mm of travel, the 16mm rod requires external guiding to prevent excessive side-loading and premature seal wear. For any load-holding requirements without live air pressure, this cylinder is insufficient; an external rod lock, a pilot-operated check valve, or an AirTAC SAIL/BSAI locking cylinder must be utilized. This SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets.
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 SAIJ40BX950-30S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear mechanical adjuster allows you to shorten the 950mm nominal stroke by up to 30mm, creating a 920-950mm usable travel window. It functions as a physical stop and does not lock the load without continuous air pressure.
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