Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ63 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S
The AirTAC SAIJ63X850-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 850mm stroke that can be dialed back by up to 75mm, giving you a precise 775-850mm usable travel window for fine-tuning end positions during commissioning. In the 63mm bore class, it delivers 2182N of push force and 1402N of pull force at 0.7MPa.
This adjustable-stop design eliminates the need to swap cylinders or bolt on external stops when product sizes change. The extruded aluminum barrel features sensor grooves on both sides, and the -S magnet option is factory-fitted for use with AirTAC CMSE reed and DMSE solid-state sensors. The M16x1.5 carbon steel rod and G3/8 PT tapered port handle robust pneumatic demands, while the 36mm air cushions at both ends manage end-of-travel deceleration.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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, 36 mm |
| Max stroke | Up to 1500 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×850 | 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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S Is Used
Variable Product Changeover
Dial in the 775-850mm travel window to accommodate different package lengths on a packaging line without physically swapping out the cylinder.
Long-Stroke Machine Setup
Fine-tune the retract end-position during initial commissioning of long-stroke machinery to perfect the seating of heavy components.
Adjustable End-Stop Positioning
Use the rear stopper screw to quickly set precise retraction limits for automated assembly processes that require flexible end-stop points.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S the Right Cylinder?
Choose this 63mm bore model when an application requires a long 850mm travel distance but still needs micro-adjustments to the retract end position. If your process demands less force, stepping down to a 50mm bore yields 1374N of push force at 0.7MPa; for heavier loads, stepping up to an 80mm bore provides 3518N. Because the stroke is 850mm, the extended rod is highly susceptible to side-loading, so an external guide rail is strongly recommended to prevent premature seal wear.
Select the SAIJ adjustable version over a fixed SAI cylinder when you need variable end-stops for machine setup or product changeovers without replacing hardware. Note that the rear adjuster acts only as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series. This SAIJ63X850-75-S is dimensionally interchangeable per ISO 15552 and uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X850-75S FAQ
This 63mm bore cylinder provides 1559N of push force and 1402N of pull force at 0.5MPa. At 0.7MPa, the push force increases to 2182N, and it reaches a maximum push force of 2805N at 0.9MPa.
The rear adjuster screw allows you to shorten the effective travel by up to 75mm. This creates a usable stroke window of 775mm to 850mm, letting you fine-tune the end position at commissioning without changing the cylinder. The adjuster is a stop, not a lock, so live air is still required to hold the load.
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