Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-40S 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 SAIJ40BX950-40S
The AirTAC SAIJ40X950-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 910 to 950 mm usable travel window, allowing you to dial back the 950 mm nominal stroke by up to 40 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it suits moderate-load tasks. The M12x1.25 rod is solid SUS304 stainless steel, and the extruded aluminum barrel includes sensor grooves on both sides for CMSE or DMSE switches.
This model uses PT tapered ports sized G1/4 and variable air cushions at both ends. The rear stopper acts purely as a travel end-setter and deceleration buffer, not a lock, so it cannot hold a load without live air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-40S |
|---|---|
| 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 SAIJ40BX950-40S
| 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 SAIJ40BX950-40S Is Used
Machine Commissioning
Fine-tune the 910-950 mm travel window during setup to perfect end-positioning without adding external stops.
Product Changeover
Quickly adjust the retract end-stop on packaging lines when handling different carton lengths.
Variable End-Stop
Dial in the exact 40 mm trim on long-stroke assemblies to accommodate varying material thicknesses.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX950-40S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore yielding 402 N at 0.5 MPa is insufficient, but a 50 mm bore yielding 982 N is excessive. An adjustable stroke is ideal for machine setups requiring variable end-stops without swapping hardware, unlike a fixed SAI cylinder. Because the stroke is 950 mm, an external guide is strongly recommended to prevent rod side-load damage.
For ISO 15552 replacement matching, verify a 40 mm bore, 950 mm stroke, 40 mm adjustment, G1/4 PT ports, and the -S magnet. If your application requires true load-holding without live air, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is only a stop.
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 SAIJ40BX950-40S FAQ
A rear screw stopper lets you trim the 950 mm nominal stroke back by up to 40 mm, creating a 910-950 mm travel window. The adjuster sets the end position and works with the air cushion for deceleration, but it does not lock or hold the load without live air pressure.
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It operates at speeds between 30 and 800 mm/s.
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