Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20
The AirTAC Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø100mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20
The AirTAC SAIJ100X250-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 250 mm stroke with a 20 mm external adjustment range, yielding a usable travel window of 230 to 250 mm. This built-in stopper allows you to fine-tune the retract end position at commissioning without swapping out the physical cylinder or adding external stops. The extruded aluminum barrel features sensor grooves on both sides for straightforward switch mounting.
In the 100 mm bore class, this model delivers substantial thrust, pushing with 3927 N and pulling with 3681 N at 0.5 MPa. It uses a G1/2 port and a robust 25 mm carbon steel rod with an M20x1.5 thread. While the 25 mm rod handles high side loads well, long unsupported strokes still require an external guide. The rear adjuster and the variable air cushions at both ends only decelerate the travel end; neither holds the load without live air pressure.
Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20 Technical Specifications
| Model | Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø100 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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 SAIJ100 Adjustable Cylinder SAIJ100X250-20 Is Used
Variable End Stops
Dial in the exact retract position within the 230-250 mm window during machine commissioning to accommodate different product lengths without external stopper blocks.
Product Changeover
Quickly readjust the rear stopper screw when switching the production line to a new item size, saving downtime compared to replacing a fixed-stroke cylinder.
Assembly Press Tuning
Fine-tune the pressing depth on an assembly line by trimming up to 20 mm off the nominal stroke, ensuring precise contact force for delicate components.
Is the Airtac SAIJ100 Adjustable Cylinder SAIJ100X250-20 the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end stops or frequent product-size changeovers, rather than committing to a fixed-stroke SAI cylinder. If you need less force, stepping down to the 80 mm bore yields 2513 N of push force at 0.5 MPa. If your application demands load-holding without continuous air pressure, note that the SAIJ rear screw is a travel stop, not a lock. For true position holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) series, or use an external pilot-operated check valve.
For an exact ISO 15552 replacement match, verify the 100 mm bore, 250 mm nominal stroke, 20 mm adjustment range, PT tapered port thread, and standard carbon steel rod. This cylinder uses the reduced SAIJ mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Because the 250 mm stroke is under 300 mm, side-load concerns are moderate, but an external guide is still 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 SAIJ100 Adjustable Cylinder SAIJ100X250-20 FAQ
At 0.5 MPa operating pressure, this 100 mm bore cylinder provides 3927 N of push force and 3681 N of pull force. At 0.7 MPa, the push force increases to 5497 N.
The rear adjuster acts as an external stopper that lets you trim the effective travel back by up to 20 mm from the 250 mm nominal stroke, creating a 230-250 mm usable window. It only sets the travel end and does not lock the load without live air pressure.
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