Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 210mm 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
- Stroke210 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S
The AirTAC SAIJ125X210-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and features a generous 75mm adjustment range, creating a usable travel window between 135mm and 210mm. This allows you to dial in the exact retract end-position during commissioning without swapping out the physical cylinder. The standard carbon steel rod and PT tapered port threads are built for heavy-duty industrial use.
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 rear adjuster functions strictly as a mechanical stop for deceleration and positioning; it does not hold the load without live air pressure. For positive load-holding, an external pilot-operated check valve or a related SAIL pneumatic lock cylinder is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 210 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 SAIJ125X210-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×210 | 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 SAIJ125X210-75S Is Used
Variable End-Stop Positioning
Ideal for press operations requiring precise retract tuning. The 75mm adjuster allows operators to shift the end-position anywhere within the 135 to 210mm window to accommodate different material thicknesses.
Machine Changeover
Speed up product line changeovers by turning the rear screw to set new stroke limits instantly, avoiding the downtime needed to physically unbolt and replace cylinders.
Heavy-Duty Clamping
Leverage the 6136N push force at 0.5 MPa to secure heavy workpieces. The carbon steel rod handles high clamping stresses while the adjuster sets the exact grip depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X210-75S the Right Cylinder?
Choose this 125mm bore when your application requires substantial thrust—stepping down to an 80mm bore drops the 0.5 MPa push force to 2513N, while stepping up to a 160mm bore yields 10053N. The SAIJ125X210-75-S is specifically selected over a fixed-stroke SAI cylinder when a machine handles multiple product sizes, letting operators change the retract end-stop on the fly. To match this cylinder for an ISO 15552 replacement, verify the 210mm stroke, 75mm adjustment range, PT port threads, and the -S magnet requirement.
Although the 210mm stroke is relatively short for this bore size, the 32mm rod diameter and M27x2 rod thread provide high rigidity. For any application approaching the maximum standard stroke limits, always use an external guide to prevent side-loading damage. Mounting is supported via the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X210-75S FAQ
At 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 mechanical adjuster acts as a stopper that lets you shorten the effective stroke by up to 75mm. For a 210mm nominal stroke, this creates a usable travel window of 135mm to 210mm, which can be fine-tuned during commissioning without adding external stops.
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