Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 185mm 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
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S
The AirTAC SAIJ63X185-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 135 to 185 mm. Driven by a G3/8 port, it generates 1559 N of pull force and 2182 N of push force at a 0.5 MPa operating pressure. The extruded aluminum barrel features sensor grooves on both sides, and because this unit includes a magnet, it is fully compatible with AirTAC CMSE reed switches and DMSE solid-state electronic sensors for precise position detection.
This specific SKU features a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance compared to standard carbon steel. The rear adjuster acts strictly as a mechanical stop to dial in the exact retract position during commissioning or product changeover without adding external stops. It is important to note that the adjuster and the variable air cushions decelerate the load but do not hold it; maintaining position requires live air pressure, a SAIL locking cylinder, or a BSAI clamp-lock.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 185 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 SAIJ63AX185-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×185 | 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 SAIJ63AX185-50S Is Used
Product Changeover
Dial in the retract position by up to 50 mm when switching a packaging line to a different carton size, eliminating the need to physically swap cylinders.
Machine Setup
Fine-tune the end-stop during initial commissioning to perfect the seating of components without fabricating custom external spacers.
Variable End Stops
Provide a adjustable travel window between 135 and 185 mm for assembly stations that occasionally require modified retraction distances based on the workpiece.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX185-50S the Right Cylinder?
Choose this 63 mm bore adjustable-stroke cylinder when an application requires fine-tuning the retract end-position on the fly, such as accommodating varying product sizes on a conveyor line. If your process demands less force, stepping down to a 50 mm bore drops the 0.5 MPa pull force to 825 N. Conversely, moving up to an 80 mm bore increases the 0.5 MPa pull force to 2268 N. Unlike a fixed-stroke SAI cylinder, the SAIJ rear screw allows you to trim up to 50 mm of travel without swapping the actuator.
When seeking an ISO 15552 interchangeable replacement, match the 63 mm bore, 185 mm nominal stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets, deliberately omitting FB, CA, CB, and CR styles. The M16x1.5 rod thread and 20 mm rod diameter handle moderate side loads well, but any application approaching the maximum 1500 mm standard stroke limit for this bore would require an external guide to prevent premature seal wear.
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 SAIJ63AX185-50S FAQ
At 0.5 MPa, this 63 mm bore cylinder provides 1559 N of pull force and 2182 N of push force. At 0.7 MPa, the push force increases to 2805 N. The operational speed range is 30-800 mm/s.
The rear adjuster screw allows you to mechanically shorten the effective stroke from 185 mm down to 135 mm. This creates a 50 mm adjustable travel window for fine-tuning end positions at commissioning. The adjuster is a stop, not a lock, so continuous live air pressure is required to hold the load.
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