Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm 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
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S
The AirTAC SAIJ125X950-100-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 950mm nominal stroke that can be fine-tuned down by up to 100mm, creating an exact 850-950mm usable travel window. This built-in adjustability allows you to dial in the retract end-position during commissioning without adding external stopper blocks.
Because this SKU includes the -S magnet option, it directly supports AirTAC CMSE reed and DMSE electronic solid-state sensors housed within the dual-side sensor grooves on the extruded aluminum barrel. The 125mm bore utilizes a G1/2 port and a robust 32mm carbon steel rod with an M27x2 thread, providing substantial rigidity for heavy loads. It also features adjustable air cushions at both ends to absorb kinetic energy, though these cushions and the rear screw act as deceleration stops, not mechanical locks.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 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 SAIJ125X950-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | 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 SAIJ125X950-100S Is Used
Heavy Product Changeover
Adjust the 100mm travel window on packaging lines to accommodate different large carton sizes without physically replacing the cylinder.
Commissioning End-Tuning
Fine-tune the exact retract position during machine setup to align heavy tooling perfectly, avoiding the need for machined spacer shims.
Variable End-Stop Forming
Dial in the precise bottoming position for large metal forming or pressing applications where the material thickness varies slightly between batches.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-100S the Right Cylinder?
Choose this 125mm bore when a 100mm bore provides insufficient thrust (delivering 3927N push at 0.5 MPa) and you need the 6136N push force this size offers. The adjustable stroke is ideal for product-size changeovers on a line, letting you shift the end-stop by up to 100mm rather than swapping the entire cylinder for a fixed-stroke SAI variant. Remember that the rear adjuster is a travel stop, not a lock; if the machine loses air pressure, this cylinder will not hold its load. For true pneumatic load-holding, consider an AirTAC SAIL or BSAI cylinder.
When replacing an ISO 15552 cylinder, match the 125mm bore, 950mm stroke, 100mm adjustment range, PT tapered port threads, and the -S magnet requirement. Mounting options for the SAIJ series are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the 950mm stroke is long and the 32mm rod is heavily loaded, always use an external guide to prevent excessive side-loading and premature seal wear.
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 SAIJ125X950-100S FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the 950mm nominal stroke by up to 100mm, providing an effective travel window of 850-950mm. This stopper sets the end position but does not lock the load without live air pressure.
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