Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S
The AirTAC Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø63mm bore and 85mm 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
- Stroke85 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S
The AirTAC SAIJ63X85-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 1559N of push force and 1402N of pull force at 0.5 MPa. By turning the rear screw, you can trim the nominal 85 mm travel back by up to 50 mm, creating a highly flexible 35 to 85 mm usable stroke window. This is an extruded aluminum barrel design, never a tie-rod type, and it includes a magnet for CMSE reed and DMSE solid-state sensors.
Because the adjuster acts purely as a mechanical stop on the retract end, it cannot hold a load without live air pressure. For position holding without continuous pressure, you would need a SAIL pneumatic lock or BSAI clamp-lock cylinder. The standard carbon steel rod uses an M16x1.5 thread, and the body features sensor grooves on both sides for flexible switch mounting.
Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S Technical Specifications
| Model | Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø63 mm |
| Stroke | 85 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 SAIJ63X85-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 63 | Bore size in mm. |
| ×85 | 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 SAIJ63X85-50S Is Used
Changeover Calibration
Dial in the 35-85 mm travel window during machine format changeovers without physically replacing the cylinder or adding external spacers.
Variable End-Stop Positioning
Set the precise retract distance for testing different product sizes on a single fixture using the rear adjustment screw.
Commissioning Fine-Tuning
Trim the stroke back by up to 50 mm during initial machine setup to perfect the timing and end-of-stroke positioning.
Is the Airtac SAIJ63 Adjustable Stroke Air Cylinder SAIJ63X85-50S the Right Cylinder?
Choose this 63 mm bore when your application requires around 1559N push force at 0.5 MPa. If your setup needs less force, stepping down to a 50 mm bore yields 982N, while moving up to an 80 mm bore provides 2513N. The 50 mm adjustment range on an 85 mm stroke is exceptionally large, making it perfect for prototyping or product changeovers where the exact end position varies significantly. Instead of swapping out a fixed-stroke SAI cylinder, you simply dial in the new retract stop.
When replacing an ISO 15552 cylinder, match the 63 mm bore, 85 mm stroke, PT tapered G3/8 port, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. At 85 mm, the stroke is short enough that side-load from the M16x1.5 rod is minimal, but always ensure linear guidance for heavy 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 SAIJ63X85-50S FAQ
The -50 code means the nominal 85 mm stroke can be mechanically shortened by up to 50 mm via a rear screw, giving an effective travel window of 35 to 85 mm. The adjuster acts as a physical stop and does not lock the load without live air pressure.
At 0.5 MPa operating pressure, it provides 1559N of push force and 1402N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 318 kgf.
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