Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm 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.
- BoreØ80 mm
- Stroke185 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S
The AirTAC SAIJ80X185-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 135 to 185 mm, letting you dial back the nominal 185 mm stroke by up to 50 mm during commissioning without adding external stops. In this bore size, it generates 3518 N of push force and 2268 N of pull force at 0.7 MPa.
This SKU includes a piston magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches. It uses a G3/8 port, a 25 mm carbon steel rod with an M20x1.5 thread, and relies on a 36 mm variable air cushion at both ends. The SAIJ mounting set omits FB, CA, CB, and CR brackets, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 185 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | 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 SAIJ80 Adjustable Cylinder SAIJ80X185-50S Is Used
Machine Changeover
Dial in the 135 to 185 mm retract position during product size changes without swapping out the entire cylinder or reworking fixed stop blocks.
End-Position Tuning
Fine-tune the final end-of-stroke location at commissioning to absorb mechanical tolerances using the 50 mm rear adjustment screw.
Variable End Stops
Set precise retraction limits on automated assembly lines where the effective stroke must be adjusted to match varying workpiece heights.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X185-50S the Right Cylinder?
Choose this adjustable-stroke model when a fixed 185 mm SAI cylinder cannot absorb mechanical variability or product changeover. The rear stopper fine-tunes the retract end position, but it is a travel limit, not a lock; the cylinder will not hold a load without live air. For load-holding without pressure, select an SAIL air-released lock, a BSAI clamp-lock, or an external rod lock. To match ISO 15552 interchangeability, specify the 80 mm bore, 185 mm stroke, 50 mm adjustment, PT tapered ports, and the -S magnet.
If you need less force, stepping down to a 63 mm bore yields 2182 N push at 0.7 MPa. Because the 185 mm stroke is under the 300 mm side-load threshold, the 25 mm rod handles standard loads well, though long unsupported strokes still need 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 SAIJ80 Adjustable Cylinder SAIJ80X185-50S FAQ
At 0.7 MPa, this 80 mm bore cylinder provides 3518 N of push force and 2268 N of pull force. It reaches a maximum of 4523 N push force at 0.9 MPa.
A rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 185 mm down to 135 mm. This adjuster and the air cushion only decelerate the travel end; neither holds the load without live air pressure.
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