Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
The 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 interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
The AirTAC SAIJ125X250-50-S is a double-acting, double-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. 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.
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?
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
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.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.