Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 70mm 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
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50
The AirTAC SAIJ40X70-50 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 879N of push force at 0.7 MPa and provides a usable travel window of 20-70mm, allowing you to trim the nominal 70mm stroke by up to 50mm during commissioning without external stops.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and utilizes PT tapered port threads with a G1/4 connection. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAIJ40BX70-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SAIJ40BX70-50 Is Used
Machine Setup & Changeover
Dial in the exact end-position during product size changeovers without swapping cylinders or adding external mechanical stops.
Variable End-Stop Positioning
Ideal for tooling stations that require frequent adjustments to the stroke length, utilizing the 20-70mm travel window.
Corrosive Environment Actuation
The SUS304 stainless steel rod provides reliable performance in light chemical or washdown environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX70-50 the Right Cylinder?
Choose this 40mm bore when you need more power than the 32mm version (563N push at 0.7 MPa) but want a smaller footprint than the 50mm option (1374N). The generous 50mm adjustment range on a 70mm stroke is perfect for prototyping or product changeovers where the exact end-position varies. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air. For load-holding without pressure, consider an external rod lock or the AirTAC SAIL series.
When replacing an ISO 15552 cylinder, verify the 40mm bore, 70mm nominal stroke, 50mm adjustment, PT port threads, and your required mounting set. The 16mm rod and M12x1.25 thread handle moderate side loads well, though any long unsupported stroke still requires an external guide.
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 SAIJ40BX70-50 FAQ
The rear adjuster allows you to shorten the effective stroke by up to 50mm. This creates a usable travel window of 20-70mm, letting you fine-tune the retract end-position at commissioning without changing the cylinder.
At 0.7 MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 739N of pull force. It operates at speeds between 30-800 mm/s.
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