Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 135mm 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
- Stroke135 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S
The AirTAC SAIJ63X135-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window down from 135 mm to a 115-135 mm range. It delivers 1559 N of push thrust at 0.5 MPa, making it well-suited for medium-force positioning tasks. The barrel is machined from extruded aluminum and includes sensor grooves on both sides to simplify switch placement.
This unit is configured with an SUS420J2 stainless steel rod (material code A) for improved corrosion resistance compared to standard carbon steel. Because it carries the -S magnet option, it directly supports position sensing using AirTAC CMSE reed or DMSE solid-state switches. The rear adjuster acts purely as a mechanical stop to trim the retract position and does not lock the load in place without live air pressure.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 135 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 SAIJ63AX135-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×135 | 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 SAIJ63AX135-20S Is Used
Machine Changeover
Dial in the retract position by up to 20 mm when switching product sizes on a packaging line, eliminating the need to physically swap out the cylinder.
End-Stop Tuning
Fine-tune the final resting position of a tooling head during commissioning to achieve perfect alignment without adding external mechanical stops.
Assembly Positioning
Push a part into a fixture using a consistent 115-135 mm travel window, leveraging the 1559 N of thrust available at 0.5 MPa.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63AX135-20S the Right Cylinder?
Choose this 63 mm bore when a 50 mm bore (offering 982 N push at 0.5 MPa) is too weak, but an 80 mm bore (delivering 2513 N) would be physically oversized. The 20 mm adjustment range is ideal for product changeovers where you need to dial in a new end position at the machine without physically swapping the cylinder or adding external stops. For load-holding during an air-loss event, note that the rear adjuster and air cushions do not function as a brake; you would need to specify a SAIL or BSAI series cylinder instead.
When replacing an ISO 15552 cylinder, match the 63 mm bore, 135 mm stroke, 20 mm adjustment, G3/8 PT port, and -S magnet. The SAIJ utilizes a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants. Since the 135 mm stroke is relatively short, side-load stress on the 20 mm rod is minimal, though external guides are always recommended for heavy radial loads.
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 SAIJ63AX135-20S FAQ
The rear of the cylinder features an external adjusting screw that lets you shorten the effective stroke by up to 20 mm. This creates a usable travel window of 115-135 mm, allowing you to trim the end position without replacing the cylinder.
At a 0.5 MPa operating pressure, the SAIJ63X135-20-S provides 1559 N of push thrust and 1402 N of pull thrust. It can deliver up to 318 kgf at its maximum rated pressure of 1.0 MPa.
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