Airtac SAIJ100 Adjustable Cylinder SAIJ100BX250-20S
The AirTAC Airtac SAIJ100 Adjustable Cylinder SAIJ100BX250-20S 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 SAIJ100BX250-20S
The AirTAC SAIJ100X250-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end-of-travel position. Outfitted with a SUS304 stainless steel rod and a -S magnet, it provides a usable travel window of 230 to 250 mm, letting you trim up to 20 mm off the nominal stroke during commissioning without adding external stops. It delivers 3927 N of push force and 3681 N of pull force at 0.5 MPa, scaling up to 7068 N push at 0.9 MPa.
This bore size uses a G1/2 port and M20x1.5 rod thread, providing a robust interface that handles greater side loads than smaller bores. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed and DMSE electronic sensors. You can fine-tune the retract end position precisely, but note the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ100 Adjustable Cylinder SAIJ100BX250-20S Technical Specifications
| Model | Airtac SAIJ100 Adjustable Cylinder SAIJ100BX250-20S |
|---|---|
| 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 SAIJ100BX250-20S
| 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 SAIJ100BX250-20S Is Used
Product Changeover
Dial in the exact end-stop distance when switching a production line to a new item size, using the 20 mm adjustment window to avoid changing the cylinder.
Variable Position Diverter
Adjust the retract stroke on a conveyor diverter gate to fine-tune the clearance for different package widths during line setup.
Machine Commissioning
Trim the travel window by up to 20 mm during initial machine commissioning to perfectly time the kinematics without re-engineering hard stops.
Is the Airtac SAIJ100 Adjustable Cylinder SAIJ100BX250-20S the Right Cylinder?
Choose this 100 mm bore when a 63 mm bore (1559 N push at 0.5 MPa) is too weak or an 80 mm bore (2513 N push at 0.5 MPa) leaves insufficient force margin. The adjustable stroke is ideal for machine changeovers where product sizes vary, letting you dial in the exact 230-250 mm end position on the fly rather than swapping a fixed-stroke SAI cylinder. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Because the 250 mm stroke is under the 300 mm side-load threshold, an external guide is less critical than on longer strokes, but the heavy forces still warrant checking your payload inertia. For applications requiring the cylinder to hold its position without continuous air pressure, note that this adjuster is not a lock; consider a SAIL pneumatic lock, a BSAI clamp-lock, or an external rod lock instead. This -S variant with a PT tapered port works seamlessly with AirTAC CMSE and DMSE sensors.
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 SAIJ100BX250-20S FAQ
At 0.5 MPa it provides 3927 N push force and 3681 N pull force. At 0.9 MPa the push force increases to 7068 N. The maximum operating pressure is 1.0 MPa.
The rear adjuster screw lets you shorten the effective stroke from the nominal 250 mm down to 230 mm. It acts as a mechanical stop to set the end position and does not function as a lock to hold the load without air pressure.
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