Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm 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.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
The AirTAC SAIJ125X250-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 50mm adjustment range, creating a usable travel window between 200mm and 250mm. This built-in adjustability allows you to dial in the exact retract end position during commissioning without adding external stops.
This -S variant includes a magnet for position sensing and is wired for AirTAC CMSE reed and DMSE electronic solid-state switches. The extruded aluminum barrel incorporates sensor grooves on both sides, and the unit omits FB, CA, CB, and CR mounts, utilizing a reduced SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X250-50S Is Used
Product Changeovers
Fine-tune the 200-250mm travel window rapidly during format size changes without swapping the cylinder or reworking fixed mechanical stops.
Heavy Assembly Presses
Leverage the 6136N push force at 0.5 MPa to seat heavy components, using the rear screw to precisely set the final clamping end position.
Variable End Stops
Dial in the retract distance up to 50mm during machine setup, allowing operators to adjust the end-of-stroke position for different material thicknesses.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S the Right Cylinder?
Choose this 125mm bore when you need significantly more thrust than the 80mm bore (which provides 2513N push at 0.5 MPa) but want to avoid the larger footprint of a 160mm cylinder. The adjustable stroke is ideal for product-size changeovers on a line, letting you fine-tune the 200-250mm travel window on the fly instead of physically swapping cylinders.
Because the stroke is 250mm, ensure adequate external guiding to handle side loads. Remember that the rear adjuster acts only as a travel stop, not a lock; the SAIJ125X250-50-S will not hold a load without live air, so use a SAIL or BSAI cylinder if pilot-operated load holding is required. This PT-ported, carbon-rod model is dimensionally interchangeable per ISO 15552.
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 SAIJ125 Adjustable Cylinder SAIJ125X250-50S FAQ
At 0.5 MPa it provides 6136N of push force and 5734N of pull force. If you increase the operating pressure to 0.7 MPa, the push force rises to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke by up to 50mm. This creates a usable travel window of 200-250mm from the 250mm nominal stroke, enabling fine-tuning at commissioning without external stops.
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